Answerer

I tend to think that the 'time of the universe'(whether at the beginning or not) came mainly from GR ( with the help of Hubble constant). Since Hubble constant was discovered based on the observations that the universe was expanding and all the distant galaxies(on the average) are moving faster than nearby ones, so ,Hubble constant and cosmological equation work just the same in most parts of the universe. Therefore we have good reasosn to believe that the 'age of the universe' that we are talking about 'works' for all frame references except maybe some of the extreme cases.

Ernest Sparks

The era before the inflation represents total symmetry, matched particles/antiparticles, matched supersymmetric partners, etc. Therefore there is no basis for any definite observer frame of reference. In a real sense, therefore, the inflation is the actual "creation" event. All vestiges/remnants of the past come from the post-inflation period, when asymmetry begins and stable configurations permit establishing observer frames of reference. If you are idealist and believe in mind separate from matter, then it behooves you to describe how to ideate a frame of reference and justify that choice.
That's my opinion.

Mr. Sammi

Eh,

if you believe the laws of physics held true at the instant of the big bang, then those laws would have already have to have been embedded at 10 E -34 secs, sorto wanno makeo youo believe in some kindo GODo. Shh do not let the creationists in on this logic...


Sammi Na Boodie (but would that not be warp time)

cfgauss

I should also point out that, just as there is no "absolute (or preferred) frame of reference" for space (i.e., it's cool to set up coordinate systems wherever and however you want), there is no "preferred time frame" either. It's just as good to measure time from Earth as it is from by a black hole as it is to measure it from a proton created in the Big Bang.

Ernest: That doesn't make any sense...

Shadowy Man

That's true for inertial reference frames only.

cfgauss

You can use non-inertial ones, as long as you remember to account for all the problems!