Big Bang Breakthrough Team Back-Pedals On Major Result 127
An anonymous reader writes A few months ago researchers announced they had discovered proof of the big bang. Now they're not so sure. Further research suggests cosmic dust might have skewed the results. "Back in March, the BICEP2 team reported a twisted pattern in the sky, which they attributed to primordial gravitational waves, wrinkles in the fabric of the universe that could have been produced when the baby universe went through an enormous growth spurt. If correct, this would confirm the theory of inflation, which says that the universe expanded exponentially in the first slivers of a second after the big bang – many believe that it continues to expand into an ever-growing multiverse. Doubts about the announcement soon emerged. The BICEP2 team identified the waves based on how they twisted, or polarised, the photons in the cosmic microwave background (CMB), the earliest light emitted in the universe around 380,000 years after the big bang. Other objects, such as the ashes of exploding stars or dust within our galaxy, can polarise light as well."
Not the Big Bang (Score:5, Informative)
There's a ton of evidence for the Big Bang, the existence of the CMB at all being one of them. That result was meant to be evidence for Inflation [wikipedia.org], which is used to explain why the universe appears evenly distributed everywhere you look, among other things.
Re:Inflation was BEFORE the big bang (Score:4, Informative)
No, it wasn't.
Re:This science does sound quasi-religious. (Score:4, Informative)
CMBR isn't a sketchy concept, it's there to be observed - as it has been for several years now. The question is whether it's uniform or undulated, which is hard to determine as we're swimming through it. It's like trying to determine the shape of a cloud when you're sitting inside it.
Re:Backpeddle? (Score:5, Informative)
I am not sure "back pedal" is really the right word here. They did some research, published a result, other researchers pointed out potential problems with the conclusions, the original team listened to the criticisms and took them seriously.
Right... its even less serious that you make it out to be.
A dumbed down explanation of how it went:
Researchers: "We finally have conclusive evidence of Inflation!"
Critics: "That's pretty cool but did you consider X?"
Researchers: "Yes, but we're not ready to publish all the data yet. If we do, someone might beat us to some other stuff we're working on"
*data finally published*
Critics: "Ah, you did account for X. You're probably correct, but X could possibly be bigger than you accounted for in some rare cases."
Researchers: "Ah, we see your point now. Ok, this isn't conclusive evidence... but it's pretty darn close. There's another group that's very close to completing a study that will confirm our observation so we'll just wait for them as it will come sooner than anything we can do."
Re:Not the Big Bang (Score:5, Informative)
Cosmic inflation has always puzzled me - so the distance between particles of matter is slowly widening, without the particles themselves actually moving, why can't we observe this at the molecular level? Or do we? Even if its only a miniscule expansion at the smallest scales it must surely show some sign, and wouldn't it have some effect on say chemical interactions?
There are three different expansive phenomenon in modern cosmology - the initial inflation of the original symmetry breaking event, the subsequent vastly longer and slower expansion (measured by the Hubble Constant) that followed where the Universe coasted under influence of gravity alone, and then the recently discovered (and cosmically more recent) cosmic acceleration.that is now offsetting gravity.
The first event lasting a trillionth of a trillionth of a trillionth of a second did indeed push all the particles then existing apart very fast, while creating lots of new particles.
The second phase of coasting, and the modern phase when cosmic acceleration kicked in, is currently pushing things apart on a cosmic scale, but not gravitationally bound structures, much less the far more strongly bound electromagnetically bound ones (atoms and molecules, and molecular agglomerations) or nuclear force bound structures.
Eventually, under current models, cosmic acceleration will strengthen to the point where it will start ripping apart these galaxy clusters. then galaxies, then star systems, then stars and bulk matter, then molecules and atoms, then nuclei,and finally composite subatomic particles themselves.
Re:Not the Big Bang (Score:4, Informative)
The speed of light is the ultimate speed limit relative to the underlying spacetime. If spacetime itself expands or contracts, that speed limit may not apply. That is, in fact, also the basis of the Alcubierre warp drive [wikipedia.org].