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Fermilab Reports Dark Energy Not Needed
An anonymous reader writes "A Fermilab press release
reports that the expansion of the universe may be
explainable without the need for dark energy or a
cosmological constant. Apparently, ripples from
inflation in the early universe may account for
the observed expansion rate of the universe."
If there was nothing to push against, what would cause something to be held back and "ripple" as if there were some sort of repulsive force?
Let's say we've reached the edge of the universe, what happens when we step beyond that boundary? What is out there that would possibly hold back further expansion of our universe?
"We realized that you simply need to add this new key ingredient, the ripples of spacetime generated during the epoch of inflation, to Einstein's General Relativity to explain why the universe is accelerating today," Riotto says. "It seems that the solution to the puzzle of acceleration involves the universe beyond our cosmic horizon. No mysterious dark energy is required."
Go science! Now if only religion could get around to realizing that . . . . . .
Only in a Slashdot fantasy can a Slackware install turn into several hours of sex . . . . .
Comment removed based on user account deletion
This anti-intellectualism stain in /. responders is saddening. Basically it seems to be, "I don't understand what they're talking about, so I think I'll make fun of them" or "I don't understand the thousands of papers that have been published, so I'm going to shout something superior-sounding from the cheap seats". Dismissing a beautiful and maturing field of physics with "we don't really know anything, so give up" is a sophomoric and pretentious reaction.
Sure, there's a bunch that we don't understand, but please realize that this is the way science works. Nature is too subtle for us to have canned and precise answers for her behavior. Cosmologists are rightly invigorated by the new data, and ought to be encouraged to research and refute each other's ideas.
Can't we just admit we don't have a freakin' clue and move along?
...but he was right. He took a stab in the dark, figured out an explanation that worked (even though it sounded insane from a "common sense" point of view), and the evidence proved him right. Time and space are relative--we know this for a fact now, because other scientists set out to prove (or disprove) Einstein's crazy ideas. We're not so sure about Dark Energy/inflation ripples/mystical tomatoes, and hell, we might never know for sure, but it's obvious that SOMETHING is going on here, and I for one am glad that the scientists of today are coming up with these all of these cheesy, crazy explanations.
Move along to what? Above all else, science is supposed to try to explain these mysteries. To give up because we don't have a (seemingly) elegant or simple explanation is, well, the anthesis of the scientific method. You've got to come up with a theory. Maybe it sounds good, and maybe it doesn't--the only real question is, does it explain the phenomenon being observed?
If I knew Einstein back in 1905, I would've told him he needed to lay off the crack pipe. "Matter bending space? Relative velocity creating differing timeframes? Dude, what a fantasy, what a KLUDGE! You can't just go ripping apart some of the basic assumptions of science just because you want Maxwell's and Newton's ideas to play nicely together."
FAR more interesting than The Elegant Universe is his subsequent book The Fabric of the Cosmos: Space, Time, and the Texture of Reality. I highly recommend this to anyone that was interested by his earlier work or the various discussions here.
Most posts here seem to be quoting science from decades ago. The errors and misconceptions too numerous. It is clear that many have no idea how far we have come in understanding everything all the way back to and including time zero, including what even caused the Big Bang. It takes a mass of just 10Kg at the Big Bang to explain all known matter and energy in the unverse today. The Inflationary Model today is nothing like the originally proposed Big Bang. It predicts and explains what we currently observe.
Fermilab's proposal is fascinating and if they are correct could have a serious impact on modern research such as the search for the Higgs boson that will be done at the CERN supercollider. The Higgs Field is related to the Inflaton Field responsible for the initial expansion.
The universe is very possibly 2 dimensional, you can think of a Pac-Man screen. If string theory is correct, all known matter is made of open ended strings. Open ended strings must be attached to a d-brane, a one or more dimensional membrane predicted by string theory. It is very likely our entire universe is attached to a 2 diminsional d-brane. This prevents our universe from any of those sci-fi parralel or other universes we love reading about. The only thing that can possibly escape is gravity, hence Gravity Phones for those of you that watched the Elegant Universe.
It isn't the universe that has to be elegant, but our theory of it. The reason why is that we aren't very smart, and theories with fewer free parameters are a lot easier for us to understand.
--Tom
Blasphemy is a human right. Blasphemophobia kills.
Well, we could get into a very long and detailed discussion into the value of basic research. I'll point out just a few of the benefits we have received from Fermilab, and leave the rest to you.
1) Ever hear of a "computing farm"? I'm sure you have. The concept was pioneered at Fermilab.
2) Ask Bob Young, "Who made the most important confirmation of the value of Linux in the early days?" Couldn't be Fermilab, could it? ( Bob Young was one of the founders of RedHat, BTW. )
3) Who has done more basic research into superconductors? Who pioneered the use of superconductors? Fermilab.
4) How many lives have been saved through the use of radiation for treating cancer? Neutron therapy was pioneered at Fermilab.
5) Do you like American Buffalo? At one time, the only surviving herds were at Fermilab and Yellowstone. Fortunately, they have made a comeback.
6) Enjoy using the web? Fermilab was the third website on the planet, behind CERN and SLAC.
I'm sure I have missed a few, but I hope you get the point. We are lucky that our ancestors didn't take the same outlook as you. Some things need a horizon of lifetimes, not just your own. How long was the electron studied? Quantum theory? Radiation? Thankfully, many did, and have left us with a rich environment to live in. I hope the current generation, and those to follow, are wise enough to invest in the future with basic research.
As for my assertion that money devoted to basic research is dropping at a alarming rate, I will leave this as an exercise for the reader. The results of your studies will be quite enlightening, and quite possibly, terrifying.
"To those who are overly cautious, everything is impossible. "
Very well put! What really shocks me is that the cowboy mentality is even so prevalent here on slashdot, where many people interested in technology seem to believe that science is of no worth, but God and bombs are.
I find it simply frightening, because I think it poses a very significant threat to the future of the USA, which is heading down the road of becoming a military power without the brains needed to steer it in a wise direction.
No, something that does not appear possible or make sense in nature does not prove that god exists. You cannot put everything that you do not understand down to god, jesus christ!
What you're missing is that science has theories that make predictions about observable things in the real world.
General Relativity, for instance, led to predictions of 1) longer particle decay times for moving subatomic particles, 2) different orbital period for Mercury than Newtonian mechanics predicted and 3) bending of starlight due to intervening gravitational fields. There are quite famous observations confirming these predictions.
Similarly, there are quite convincing observations that lend support to the Big Bang theory. Cosmic backround radiation measurements, observed Hubble expansion and observations of galactic evolution as we look further away (further into the past) come to mind as examples.
That is the difference between religion and science. Science attempts to verify its theories with observed phenomena and experiments. Religion accepts its theories based on blind faith.
All that said, there is nothing incompatible between science and religion really, as long as your religion doesn't dogmatically insist its wisdom about the real world subsumes observed scientific knowledge (the big trap into which some Christian sects seem to have fallen). In fact, I would argue that quantum mechanics provides an interesting "out" for religion - quantum randomness versus "Gods will". After all, quantum randomness is neither knowable or predictable for us, but it might be exactly enacting Gods will...
I've often wondered why Einstein said "God would never play dice with the Universe". Perhaps Gods dice are loaded. :-)
Galileo: "The Earth revolves around the Sun!"
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