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…. question is have they neglected the effects of time dilation in their thought experiment?
The time reversed movie will break simply because it will eventually reach the inflationary era. This is after all the whole point; to validate the big bang hypothesis. Unless I am mistaken.
dlorde: see John Horgan's blog where "Physicist Paul Steinhardt Slams Inflation, [the] Cosmic Theory He Helped Conceive". I don't think inflation is an essential part of big-bang cosmology myself. Expansion yes, but not inflation. IMHO it's a solution for a problem that doesn't exist.
...my point was that I don't think you can validate the big bang hypothesis by an assertion of inflation
I don't have the maths for a proper critique of my own.
Quote from: jeffreyH on 11/01/2015 21:55:03The time reversed movie will break simply because it will eventually reach the inflationary era. This is after all the whole point; to validate the big bang hypothesis. Unless I am mistaken.But the argument wasn't about inflation, it was that the traveller would appear to moving > c.Also, inflation is a consequence or requirement of the big bang theory... if you posit eternal expansion without big bang or inflation, you won't reach the inflationary era (though there are probably plenty of other reasons to reject eternal expansion in favour of the big bang - such as the CBR).
In such a universe you will find astronomical proofs for a 'start of time'