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Friday, April 15, 2011

President Obama's Fiscal Policy speach

Remarks by the President on Fiscal Policy

George Washington University

Washington, D.C.

1:48 P.M. EDT

THE PRESIDENT:  Thank you very much.  (Applause.)  Please have a seat.  Please have a seat, everyone.

It is wonderful to be back at GW.  I want you to know that one of the reasons that I worked so hard with Democrats and Republicans to keep the government open was so that I could show up here today.  I wanted to make sure that all of you had one more excuse to skip class.  (Laughter.)  You’re welcome.  (Laughter.) 

I want to give a special thanks to Steven Knapp, the president of GW.  I just saw him -- where is he?  There he is right there.  (Applause.)
We've got a lot of distinguished guests here -- a couple of people I want to acknowledge.  First of all, my outstanding Vice President, Joe Biden, is here.  (Applause.)  Our Secretary of the Treasury, Tim Geithner, is in the house.  (Applause.)  Jack Lew, the Director of the Office of Mangement and Budget.  (Applause.) Gene Sperling, Chair of the National Economic Council, is here.  (Applause.)  Members of our bipartisan Fiscal Commission are here, including the two outstanding chairs -- Erskine Bowles and Alan Simpson -- are here.  (Applause.)

And we have a number of members of Congress here today.  I'm grateful for all of you taking the time to attend.
What we’ve been debating here in Washington over the last few weeks will affect the lives of the students here and families all across America in potentially profound ways.  This debate over budgets and deficits is about more than just numbers on a page; it’s about more than just cutting and spending.  It’s about the kind of future that we want.  It’s about the kind of country that we believe in.  And that’s what I want to spend some time talking about today.
From our first days as a nation, we have put our faith in free markets and free enterprise as the engine of America’s wealth and prosperity.  More than citizens of any other country, we are rugged individualists, a self-reliant people with a healthy skepticism of too much government.

But there’s always been another thread running through our history -– a belief that we’re all connected, and that there are some things we can only do together, as a nation.  We believe, in the words of our first Republican President, Abraham Lincoln, that through government, we should do together what we cannot do as well for ourselves.

And so we’ve built a strong military to keep us secure, and public schools and universities to educate our citizens.  We’ve laid down railroads and highways to facilitate travel and commerce.  We’ve supported the work of scientists and researchers whose discoveries have saved lives, unleashed repeated technological revolutions, and led to countless new jobs and entire new industries.  Each of us has benefitted from these investments, and we’re a more prosperous country as a result.    

Part of this American belief that we’re all connected also expresses itself in a conviction that each one of us deserves some basic measure of security and dignity.  We recognize that no matter how responsibly we live our lives, hard times or bad luck, a crippling illness or a layoff may strike any one of us.  “There but for the grace of God go I,” we say to ourselves.  And so we contribute to programs like Medicare and Social Security, which guarantee us health care and a measure of basic income after a lifetime of hard work; unemployment insurance, which protects us against unexpected job loss; and Medicaid, which provides care for millions of seniors in nursing homes, poor children, those with disabilities.  We’re a better country because of these commitments.  I’ll go further.  We would not be a great country without those commitments.       

Now, for much of the last century, our nation found a way to afford these investments and priorities with the taxes paid by its citizens.  As a country that values fairness, wealthier individuals have traditionally borne a greater share of this burden than the middle class or those less fortunate.  Everybody pays, but the wealthier have borne a little more.  This is not because we begrudge those who’ve done well -– we rightly celebrate their success.  Instead, it’s a basic reflection of our belief that those who’ve benefited most from our way of life can afford to give back a little bit more.  Moreover, this belief hasn’t hindered the success of those at the top of the income scale.  They continue to do better and better with each passing year.

Now, at certain times -– particularly during war or recession -– our nation has had to borrow money to pay for some of our priorities.  And as most families understand, a little credit card debt isn’t going to hurt if it’s temporary.
But as far back as the 1980s, America started amassing debt at more alarming levels, and our leaders began to realize that a larger challenge was on the horizon.  They knew that eventually, the Baby Boom generation would retire, which meant a much bigger portion of our citizens would be relying on programs like Medicare, Social Security, and possibly Medicaid.  Like parents with young children who know they have to start saving for the college years, America had to start borrowing less and saving more to prepare for the retirement of an entire generation.

To meet this challenge, our leaders came together three times during the 1990s to reduce our nation’s deficit -- three times.  They forged historic agreements that required tough decisions made by the first President Bush, then made by President Clinton, by Democratic Congresses and by a Republican Congress.  All three agreements asked for shared responsibility and shared sacrifice.  But they largely protected the middle class; they largely protected our commitment to seniors; they protected our key investments in our future.
As a result of these bipartisan efforts, America’s finances were in great shape by the year 2000.  We went from deficit to surplus.  America was actually on track to becoming completely debt free, and we were prepared for the retirement of the Baby Boomers.

But after Democrats and Republicans committed to fiscal discipline during the 1990s, we lost our way in the decade that followed.  We increased spending dramatically for two wars and an expensive prescription drug program -– but we didn’t pay for any of this new spending.  Instead, we made the problem worse with trillions of dollars in unpaid-for tax cuts -– tax cuts that went to every millionaire and billionaire in the country; tax cuts that will force us to borrow an average of $500 billion every year over the next decade.
To give you an idea of how much damage this caused to our nation’s checkbook, consider this:  In the last decade, if we had simply found a way to pay for the tax cuts and the prescription drug benefit, our deficit would currently be at low historical levels in the coming years.

But that’s not what happened.  And so, by the time I took office, we once again found ourselves deeply in debt and unprepared for a Baby Boom retirement that is now starting to take place.  When I took office, our projected deficit, annually, was more than $1 trillion.  On top of that, we faced a terrible financial crisis and a recession that, like most recessions, led us to temporarily borrow even more.

In this case, we took a series of emergency steps that saved millions of jobs, kept credit flowing, and provided working families extra money in their pocket.  It was absolutely the right thing to do, but these steps were expensive, and added to our deficits in the short term.

So that’s how our fiscal challenge was created.  That’s how we got here.  And now that our economic recovery is gaining strength, Democrats and Republicans must come together and restore the fiscal responsibility that served us so well in the 1990s.  We have to live within our means.  We have to reduce our deficit, and we have to get back on a path that will allow us to pay down our debt.  And we have to do it in a way that protects the recovery, protects the investments we need to grow, create jobs, and helps us win the future.

Now, before I get into how we can achieve this goal, some of you, particularly the younger people here -- you don't qualify, Joe.  (Laughter.)  Some of you might be wondering, “Why is this so important?  Why does this matter to me?”
Well, here’s why.  Even after our economy recovers, our government will still be on track to spend more money than it takes in throughout this decade and beyond.  That means we’ll have to keep borrowing more from countries like China.  That means more of your tax dollars each year will go towards paying off the interest on all the loans that we keep taking out.  By the end of this decade, the interest that we owe on our debt could rise to nearly $1 trillion.  Think about that.  That's the interest -- just the interest payments. 
Then, as the Baby Boomers start to retire in greater numbers and health care costs continue to rise, the situation will get even worse.  By 2025, the amount of taxes we currently pay will only be enough to finance our health care programs -- Medicare and Medicaid -- Social Security, and the interest we owe on our debt.  That’s it.  Every other national priority -– education, transportation, even our national security -– will have to be paid for with borrowed money.

Now, ultimately, all this rising debt will cost us jobs and damage our economy.  It will prevent us from making the investments we need to win the future.  We won’t be able to afford good schools, new research, or the repair of roads -– all the things that create new jobs and businesses here in America.  Businesses will be less likely to invest and open shop in a country that seems unwilling or unable to balance its books.  And if our creditors start worrying that we may be unable to pay back our debts, that could drive up interest rates for everybody who borrows money -– making it harder for businesses to expand and hire, or families to take out a mortgage.

Here’s the good news:  That doesn’t have to be our future.  That doesn’t have to be the country that we leave our children.  We can solve this problem.  We came together as Democrats and Republicans to meet this challenge before; we can do it again.

But that starts by being honest about what’s causing our deficit.  You see, most Americans tend to dislike government spending in the abstract, but like the stuff that it buys.  Most of us, regardless of party affiliation, believe that we should have a strong military and a strong defense.  Most Americans believe we should invest in education and medical research.  Most Americans think we should protect commitments like Social Security and Medicare.  And without even looking at a poll, my finely honed political instincts tell me that almost nobody believes they should be paying higher taxes.  (Laughter.)
So because all this spending is popular with both Republicans and Democrats alike, and because nobody wants to pay higher taxes, politicians are often eager to feed the impression that solving the problem is just a matter of eliminating waste and abuse.  You’ll hear that phrase a lot.  “We just need to eliminate waste and abuse.”  The implication is that tackling the deficit issue won’t require tough choices.  Or politicians suggest that we can somehow close our entire deficit by eliminating things like foreign aid, even though foreign aid makes up about 1 percent of our entire federal budget.

So here’s the truth.  Around two-thirds of our budget -- two-thirds -- is spent on Medicare, Medicaid, Social Security, and national security.  Two-thirds.  Programs like unemployment

insurance, student loans, veterans’ benefits, and tax credits for working families take up another 20 percent.  What’s left, after interest on the debt, is just 12 percent for everything else.  That’s 12 percent for all of our national priorities -- education, clean energy, medical research, transportation, our national parks, food safety, keeping our air and water clean -- you name it -- all of that accounts for 12 percent of our budget.

Now, up till now, the debate here in Washington, the cuts proposed by a lot of folks in Washington, have focused exclusively on that 12 percent.  But cuts to that 12 percent alone won’t solve the problem.  So any serious plan to tackle our deficit will require us to put everything on the table, and take on excess spending wherever it exists in the budget.

A serious plan doesn’t require us to balance our budget overnight –- in fact, economists think that with the economy just starting to grow again, we need a phased-in approach –- but it does require tough decisions and support from our leaders in both parties now.  Above all, it will require us to choose a vision of the America we want to see five years, 10 years, 20 years down the road.
Now, to their credit, one vision has been presented and championed by Republicans in the House of Representatives and embraced by several of their party’s presidential candidates.  It’s a plan that aims to reduce our deficit by $4 trillion over the next 10 years, and one that addresses the challenge of Medicare and Medicaid in the years after that.

These are both worthy goals.  They’re worthy goals for us to achieve.  But the way this plan achieves those goals would lead to a fundamentally different America than the one we’ve known certainly in my lifetime.  In fact, I think it would be fundamentally different than what we’ve known throughout our history.

A 70 percent cut in clean energy.  A 25 percent cut in education.  A 30 percent cut in transportation.  Cuts in college Pell Grants that will grow to more than $1,000 per year.  That’s the proposal.  These aren’t the kind of cuts you make when you’re trying to get rid of some waste or find extra savings in the budget.  These aren’t the kinds of cuts that the Fiscal Commission proposed.  These are the kinds of cuts that tell us we can’t afford the America that I believe in and I think you believe in.

I believe it paints a vision of our future that is deeply pessimistic.  It’s a vision that says if our roads crumble and our bridges collapse, we can’t afford to fix them.  If there are bright young Americans who have the drive and the will but not the money to go to college, we can’t afford to send them.
Go to China and you’ll see businesses opening research labs and solar facilities.  South Korean children are outpacing our kids in math and science.  They’re scrambling to figure out how they put more money into education.  Brazil is investing billions in new infrastructure and can run half their cars not on high-priced gasoline, but on biofuels.  And yet, we are presented with a vision that says the American people, the United States of America -– the greatest nation on Earth -– can’t afford any of this.

It’s a vision that says America can’t afford to keep the promise we’ve made to care for our seniors.  It says that 10 years from now, if you’re a 65-year-old who’s eligible for Medicare, you should have to pay nearly $6,400 more than you would today.  It says instead of guaranteed health care, you will get a voucher.  And if that voucher isn’t worth enough to buy the insurance that’s available in the open marketplace, well, tough luck -– you’re on your own.  Put simply, it ends Medicare as we know it.

It’s a vision that says up to 50 million Americans have to lose their health insurance in order for us to reduce the deficit.  Who are these 50 million Americans?  Many are somebody’s grandparents -- may be one of yours -- who wouldn’t be able to afford nursing home care without Medicaid.  Many are poor children.  Some are middle-class families who have children with autism or Down’s syndrome.  Some of these kids with disabilities are -- the disabilities are so severe that they require 24-hour care.  These are the Americans we’d be telling to fend for themselves.   
  
And worst of all, this is a vision that says even though Americans can’t afford to invest in education at current levels, or clean energy, even though we can’t afford to maintain our commitment on Medicare and Medicaid, we can somehow afford more than $1 trillion in new tax breaks for the wealthy.  Think about that.

In the last decade, the average income of the bottom 90 percent of all working Americans actually declined.  Meanwhile, the top 1 percent saw their income rise by an average of more than a quarter of a million dollars each.  That’s who needs to pay less taxes?

They want to give people like me a $200,000 tax cut that’s paid for by asking 33 seniors each to pay $6,000 more in health costs.  That’s not right.  And it’s not going to happen as long as I’m President.  (Applause.)
This vision is less about reducing the deficit than it is about changing the basic social compact in America.  Ronald Reagan’s own budget director said, there’s nothing “serious” or “courageous” about this plan.  There’s nothing serious about a plan that claims to reduce the deficit by spending a trillion dollars on tax cuts for millionaires and billionaires.  And I don't think there’s anything courageous about asking for sacrifice from those who can least afford it and don’t have any clout on Capitol Hill.  That's not a vision of the America I know.
The America I know is generous and compassionate.  It’s a land of opportunity and optimism.  Yes, we take responsibility for ourselves, but we also take responsibility for each other; for the country we want and the future that we share.  We’re a nation that built a railroad across a continent and brought light to communities shrouded in darkness.  We sent a generation to college on the GI Bill and we saved millions of seniors from poverty with Social Security and Medicare.  We have led the world in scientific research and technological breakthroughs that have transformed millions of lives.  That’s who we are.  This is the America that I know.  We don’t have to choose between a future of spiraling debt and one where we forfeit our investment in our people and our country.

To meet our fiscal challenge, we will need to make reforms. We will all need to make sacrifices.  But we do not have to sacrifice the America we believe in.  And as long as I’m President, we won’t.

So today, I’m proposing a more balanced approach to achieve $4 trillion in deficit reduction over 12 years.  It’s an approach that borrows from the recommendations of the bipartisan Fiscal Commission that I appointed last year, and it builds on the roughly $1 trillion in deficit reduction I already proposed in my 2012 budget.  It’s an approach that puts every kind of spending on the table -- but one that protects the middle class, our promise to seniors, and our investments in the future.

The first step in our approach is to keep annual domestic spending low by building on the savings that both parties agreed to last week.  That step alone will save us about $750 billion over 12 years.  We will make the tough cuts necessary to achieve these savings, including in programs that I care deeply about, but I will not sacrifice the core investments that we need to grow and create jobs.  We will invest in medical research.  We will invest in clean energy technology.  We will invest in new roads and airports and broadband access.  We will invest in education.  We will invest in job training.  We will do what we need to do to compete, and we will win the future.

The second step in our approach is to find additional savings in our defense budget.  Now, as Commander-in-Chief, I have no greater responsibility than protecting our national security, and I will never accept cuts that compromise our ability to defend our homeland or America’s interests around the world.  But as the Chairman of the Joint Chiefs, Admiral Mullen, has said, the greatest long-term threat to America’s national security is America’s debt.  So just as we must find more savings in domestic programs, we must do the same in defense.  And we can do that while still keeping ourselves safe.

Over the last two years, Secretary Bob Gates has courageously taken on wasteful spending, saving $400 billion in current and future spending.  I believe we can do that again.  We need to not only eliminate waste and improve efficiency and effectiveness, but we’re going to have to conduct a fundamental review of America’s missions, capabilities, and our role in a changing world.  I intend to work with Secretary Gates and the Joint Chiefs on this review, and I will make specific decisions about spending after it’s complete.   

The third step in our approach is to further reduce health care spending in our budget.  Now, here, the difference with the House Republican plan could not be clearer.  Their plan essentially lowers the government’s health care bills by asking seniors and poor families to pay them instead.  Our approach lowers the government’s health care bills by reducing the cost of health care itself.
Already, the reforms we passed in the health care law will reduce our deficit by $1 trillion.  My approach would build on these reforms.  We will reduce wasteful subsidies and erroneous payments.  We will cut spending on prescription drugs by using Medicare’s purchasing power to drive greater efficiency and speed generic brands of medicine onto the market.  We will work with governors of both parties to demand more efficiency and accountability from Medicaid.
We will change the way we pay for health care -– not by the procedure or the number of days spent in a hospital, but with new incentives for doctors and hospitals to prevent injuries and improve results.  And we will slow the growth of Medicare costs by strengthening an independent commission of doctors, nurses, medical experts and consumers who will look at all the evidence and recommend the best ways to reduce unnecessary spending while protecting access to the services that seniors need. 

Now, we believe the reforms we’ve proposed to strengthen Medicare and Medicaid will enable us to keep these commitments to our citizens while saving us $500 billion by 2023, and an additional $1 trillion in the decade after that.  But if we’re wrong, and Medicare costs rise faster than we expect, then this approach will give the independent commission the authority to make additional savings by further improving Medicare. 

But let me be absolutely clear:  I will preserve these health care programs as a promise we make to each other in this society.  I will not allow Medicare to become a voucher program that leaves seniors at the mercy of the insurance industry, with a shrinking benefit to pay for rising costs.  I will not tell families with children who have disabilities that they have to fend for themselves.  We will reform these programs, but we will not abandon the fundamental commitment this country has kept for generations.

That includes, by the way, our commitment to Social Security.  While Social Security is not the cause of our deficit, it faces real long-term challenges in a country that’s growing older.  As I said in the State of the Union, both parties should work together now to strengthen Social Security for future generations.  But we have to do it without putting at risk current retirees, or the most vulnerable, or people with disabilities; without slashing benefits for future generations; and without subjecting Americans’ guaranteed retirement income to the whims of the stock market.  And it can be done.

Emphasis mine

The fourth step in our approach is to reduce spending in the tax code, so-called tax expenditures.  In December, I agreed to extend the tax cuts for the wealthiest Americans because it was the only way I could prevent a tax hike on middle-class Americans.  But we cannot afford $1 trillion worth of tax cuts for every millionaire and billionaire in our society.  We can’t afford it.  And I refuse to renew them again. 

Beyond that, the tax code is also loaded up with spending on things like itemized deductions.  And while I agree with the goals of many of these deductions, from homeownership to charitable giving, we can’t ignore the fact that they provide millionaires an average tax break of $75,000 but do nothing for the typical middle-class family that doesn’t itemize.  So my budget calls for limiting itemized deductions for the wealthiest 2 percent of Americans -- a reform that would reduce the deficit by $320 billion over 10 years. 
But to reduce the deficit, I believe we should go further.  And that’s why I’m calling on Congress to reform our individual tax code so that it is fair and simple -- so that the amount of taxes you pay isn’t determined by what kind of accountant you can afford.

I believe reform should protect the middle class, promote economic growth, and build on the fiscal commission’s model of reducing tax expenditures so that there’s enough savings to both lower rates and lower the deficit.  And as I called for in the State of the Union, we should reform our corporate tax code as well, to make our businesses and our economy more competitive.  
So this is my approach to reduce the deficit by $4 trillion over the next 12 years.  It’s an approach that achieves about $2 trillion in spending cuts across the budget.  It will lower our interest payments on the debt by $1 trillion.  It calls for tax reform to cut about $1 trillion in tax expenditures -- spending in the tax code.  And it achieves these goals while protecting the middle class, protecting our commitment to seniors, and protecting our investments in the future. 

Now, in the coming years, if the recovery speeds up and our economy grows faster than our current projections, we can make even greater progress than I’ve pledged here.  But just to hold Washington -- and to hold me --- accountable and make sure that the debt burden continues to decline, my plan includes a debt failsafe.  If, by 2014, our debt is not projected to fall as a share of the economy -– if we haven’t hit our targets, if Congress has failed to act -– then my plan will require us to come together and make up the additional savings with more spending cuts and more spending reductions in the tax code.  That should be an incentive for us to act boldly now, instead of kicking our problems further down the road.  

So this is our vision for America -– this is my vision for America -- a vision where we live within our means while still investing in our future; where everyone makes sacrifices but no one bears all the burden; where we provide a basic measure of security for our citizens and we provide rising opportunity for our children. 

There will be those who vigorously disagree with my approach.  I can guarantee that as well.  (Laughter.)  Some will argue we should not even consider ever -- ever -- raising taxes, even if only on the wealthiest Americans.  It’s just an article of faith to them.  I say that at a time when the tax burden on the wealthy is at its lowest level in half a century, the most fortunate among us can afford to pay a little more.  I don’t need another tax cut.  Warren Buffett doesn’t need another tax cut.  Not if we have to pay for it by making seniors pay more for Medicare.  Or by cutting kids from Head Start.  Or by taking away college scholarships that I wouldn’t be here without and that some of you would not be here without.

And here’s the thing:  I believe that most wealthy Americans would agree with me.  They want to give back to their country, a country that’s done so much for them.  It’s just Washington hasn’t asked them to.

Others will say that we shouldn’t even talk about cutting spending until the economy is fully recovered.  These are mostly folks in my party.  I’m sympathetic to this view -- which is one of the reasons I supported the payroll tax cuts we passed in December.  It’s also why we have to use a scalpel and not a machete to reduce the deficit, so that we can keep making the investments that create jobs.  But doing nothing on the deficit is just not an option.  Our debt has grown so large that we could do real damage to the economy if we don’t begin a process now to get our fiscal house in order. 

Finally, there are those who believe we shouldn’t make any reforms to Medicare, Medicaid, or Social Security, out of fear that any talk of change to these programs will immediately usher in the sort of steps that the House Republicans have proposed.  And I understand those fears.  But I guarantee that if we don’t make any changes at all, we won’t be able to keep our commitment to a retiring generation that will live longer and will face higher health care costs than those who came before.

Indeed, to those in my own party, I say that if we truly believe in a progressive vision of our society, we have an obligation to prove that we can afford our commitments.  If we believe the government can make a difference in people’s lives, we have the obligation to prove that it works -– by making government smarter, and leaner and more effective.

Of course, there are those who simply say there’s no way we can come together at all and agree on a solution to this challenge.  They’ll say the politics of this city are just too broken; the choices are just too hard; the parties are just too far apart.  And after a few years on this job, I have some sympathy for this view.  (Laughter.)

But I also know that we’ve come together before and met big challenges.  Ronald Reagan and Tip O’Neill came together to save Social Security for future generations.  The first President Bush and a Democratic Congress came together to reduce the deficit.  President Clinton and a Republican Congress battled each other ferociously, disagreed on just about everything, but they still found a way to balance the budget.  And in the last few months, both parties have come together to pass historic tax relief and spending cuts.
And I know there are Republicans and Democrats in Congress who want to see a balanced approach to deficit reduction.  And even those Republicans I disagree with most strongly I believe are sincere about wanting to do right by their country.  We may disagree on our visions, but I truly believe they want to do the right thing.

So I believe we can, and must, come together again.  This morning, I met with Democratic and Republican leaders in Congress to discuss the approach that I laid out today.  And in early May, the Vice President will begin regular meetings with leaders in both parties with the aim of reaching a final agreement on a plan to reduce the deficit and get it done by the end of June.
I don’t expect the details in any final agreement to look exactly like the approach I laid out today.  This a democracy; that’s not how things work.  I’m eager to hear other ideas from all ends of the political spectrum.  And though I’m sure the criticism of what I’ve said here today will be fierce in some quarters, and my critique of the House Republican approach has been strong, Americans deserve and will demand that we all make an effort to bridge our differences and find common ground.

This larger debate that we’re having -- this larger debate about the size and the role of government -- it has been with us since our founding days.  And during moments of great challenge and change, like the one that we’re living through now, the debate gets sharper and it gets more vigorous.  That’s not a bad thing.  In fact, it’s a good thing.  As a country that prizes both our individual freedom and our obligations to one another, this is one of the most important debates that we can have.

But no matter what we argue, no matter where we stand, we’ve always held certain beliefs as Americans.  We believe that in order to preserve our own freedoms and pursue our own happiness, we can’t just think about ourselves.  We have to think about the country that made these liberties possible.  We have to think about our fellow citizens with whom we share a community.  And we have to think about what’s required to preserve the American Dream for future generations.

This sense of responsibility -- to each other and to our country -- this isn’t a partisan feeling.  It isn’t a Democratic or a Republican idea.  It’s patriotism.
The other day I received a letter from a man in Florida.  He started off by telling me he didn’t vote for me and he hasn’t always agreed with me.  But even though he’s worried about our economy and the state of our politics -- here’s what he said -- he said, “I still believe.  I believe in that great country that my grandfather told me about.  I believe that somewhere lost in this quagmire of petty bickering on every news station, the ‘American Dream’ is still alive…We need to use our dollars here rebuilding, refurbishing and restoring all that our ancestors struggled to create and maintain…

“I still believe.”  I still believe as well.  And I know that if we can come together and uphold our responsibilities to one another and to this larger enterprise that is America, we will keep the dream of our founding alive -- in our time; and we will pass it on to our children.  We will pass on to our children a country that we believe in.

Thank you.  God bless you, and may God bless the United States of America.  (Applause.)

Tuesday, April 5, 2011

Dark matter

Over the past few years there has been much talk about dark matter in the popular scientific press.  A major reason for having to  hypothesize that such a material exists is the fact that galaxies rotate faster than they should based on the estimated  amount of visible matter in them.  The heavier a galaxy the faster it rotates.  
 
The total weight of visible  matter in a galaxy is derived by interpreting  the amount of matter that must exist in stars in order to produce the amount of observed electro-magnetic radiation (light and wave lengths both longer and shorter).  From what I can gather from the popular literature, the scientists are not talking about objects such as planets or dust clouds which are made out of ordinary (barionic) matter or even of black holes which are made of highly compressed conventional matter,  all of  which are dark.  
 
They are talking about  some totally different type of exotic material which has weight such, possibly,  as the elusive WHIMPS.

Right at the outset, I have to admit that I am a Newtonian physicist.  I taught senior physics in high school and that is the limit of my knowledge of the subject.  Quantum mechanics, relativity, string theory and such topics are total mysteries to me.  Therefore, take what you read, below, with  a pinch or two of salt. 

What triggered off this blog was reading an article in New Scientist (reference coming as soon as I can find it again) which reported that by looking at the infra red spectrum  from other galaxies, they discovered that there are a very large number of red dwarf stars that had not being taken into account in previous estimates of the weight of said galaxies.  The thought struck me:--- how much less dark matter is it now necessary to hypothesize, to explain the rotational speed of these galaxies because of this finding.  Then I got to thinking:--- How much other conventional matter will we discover as our technology improves.   
 
And about some other possible sources of conventional dark matter (rather than the hypothesized exotic kind)

1)  How about cosmic rays.  Has anyone taken them into account.  Cosmic rays are not rays any more than alpha rays are rays*.  Cosmic rays are nuclei of atoms, some of them at least as far up the periodic table as iron, traveling through space at relativistic speeds.  The flux of these particles out here on the fringes of our galaxy, the Milky Way, is not large but consider that our nearest star is 4.3 light years away.  Lets say that cosmic rays from that distance heading our way will reach us in 5 years (they are relativistic meaning that they are traveling at a considerable portion of the speed of light).  That is a considerable weight of matter.  Add to that, that in the center of the milky way, the flux is undoubtedly much larger and that all of space between the stars have these nuclei whizzing around and it adds up to quite a bit of weight.  It might even be that since they are relativistic, they are significantly 'heavier' than a similar nuclei at rest (Einstein relativity) and hence have a greater gravitational effect than the same number of nuclei at rest.

*Alpha rays are helium nuclei emitted during the decay of certain radioactive isotopes.  A Helium nucleus has 2 protons and 2 neutrons. They, typically, are ejected at about 5% of the speed of light.  About a tenth of cosmic rays are helium nucleii (alpha particles)  Many are much heavier.  Some cosmic rays are traveling much faster than  alpha 'rays' which are derived from radioactive sources. These heavier and faster cosmic rays are accelerated by magnetic fields in the cosmos.

2)  How about light itself.  It has been shown that as a ray of light passes by heavy objects**  it bends.  This is why lensing, which is used to study distant stars and galaxies, works.  If light bends as it comes near an object, in some sense, it has weight.  Again all the light which is traveling within our galaxy adds weight to it.  How many tons per second does even our modest sized sun put out by converting matter to Electomagnetic radiation.  How much matter is in the form of electromagnetic radiation at any given time in our galaxy. If a ton of matter is turned into electromagnetic radiation, is it's Newtonian weight a ton (or more or less)?

**One of Einsteins predictions, proven during an eclipse of the sunI have a problem with this also.  Could it not be that this bending is simply light being bent as it passes through the outer atmosphere (solar/stellar wind) similar to the phenomenon that produces our red sun rises and sun sets. 

3) And what of neutrinos.  They are very light, even compared to electrons but the flux of these particles is huge.
 
4) Then there are black holes.  Apparently it is thought that a very large black hole exists at the center of each galaxy.  Black holes by definition do not give out light.  The only way we can infer the weight of black holes is by the speed of rotation of stars around the hole.    The heavier the black hole, the faster the rotation.  It is also hypothesized that there are black holes within our galaxy (not in the center).  These would also be almost undetectable and give weight to the galaxy but no light*.

*New Scientist 7 May, 2011, p18

5)Then we have some more prosaic considerations.  This may be the 'biggie'.  How about simple shading.  If we observe a distant galaxy, many stars are behind other stars.  The stars behind are shaded by nearer stars so we have to make some sort of estimate of how much of the light output of the galaxy is not visible to us.  I wonder what assumptions are made to  estimate this factor.  A possible indication of this is that galaxies we observe from the top (or 'bottom') would seem to need less dark matter to explain their rotation than ones we observe edge on.  Edge on there would be more shading.

6) Of course there are all the conventional planets, free planets (not rotating around a sun), asteroids, dust, dead suns and so forth.  Are we basing the estimates of the total aggregate weight of these on the concentration in our local part of the Milky Way galaxy.  If we can't see them because they only show up by reflected light, it is hard to estimate how much there is.


At the bottom of the whole controversy is the fact that we can only factor in what we have already found and we are finding new things about our cosmos all the time (like the aformentioned red dwarfs).  I wonder if, as we find more and more, as yet undiscovered sources of conventional mass, the need for exotic (non barionic) dark matter to explain the rotational speed of galaxies will decrease or even disappear.

Remember Ocams Razor.