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Many of the still open questions about cosmology will be answered by advances in high-energy physics. But not all. In fact, we are reaching the practical technological limits of studying particle physics by means of massive accelerators. In the future, our best sources of observational information for both high-energy physics and cosmology will be telescopes and other sorts of energy detectors that are tuned to observe processes in the universe which happened -- literally -- very far away and very long ago.
The topics covered by other pages under this one (listed and described in the box above) indicate most of the major open questions. But we can make a brief summary. Here are the big questions which we can realistically hope to address specifically in the area of cosmology:
* Is the inflationary hypothesis -- which determines the "initial conditions" that control practically everything we can now observe in the universe -- generally accurate?
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Originally posted by Arbitrageur
reply to post by AncientShade
The inflation theory requires that matter travels faster than the speed of light in violation of the laws of physics as we know them, so it's more than just answering if the model is accurate. It's basically re-writing the laws of physics as we know them to enable matter to travel faster than light, something we believe to be impossible.
That's my point. The expansion now is near the speed of light.
Originally posted by CLPrime
Metric expansion/inflation does not involve matter moving at faster than the speed of light... if this were true, then even the current expansion would approach a violation of that, as matter very near the CMB are, relative to us, travelling at very near the speed of light.
I never said it violated relativity.
Originally posted by CLPrime
But the point is that metric expansion does not violate the "speed limit" imposed by Relativity no matter how fast that expansion is. It doesn't violate Relativity because metric expansion is not a proper velocity. There's nothing for us to further understand, in that regard, because there is no contradiction.
So I'd say the inflation field is one major thing we need to understand, but don't.
Unsolved problems in physics
Is the theory of cosmological inflation correct, and if so, what are the details of this epoch? What is the hypothetical inflaton field giving rise to inflation?
Originally posted by Arbitrageur
I never said it violated relativity.