The problem with time and age of universe (or age of anything celestial)

(ok this is quite a random post, but something that have been on my mind for quite some time)

As we all already know from Einstein theory of relativity, time, is relative to gravity and speed of the observer. An observer which moves at a faster speed experiences time which is slower than another observer which moves at a slower speed. An observer which on a planet with higher gravity experiences time which is slower than an observer which on a planet with a lower gravity.

In the big bang theory, the universe started off at a singularity point which have near infinity mass, with near zero volume, leading to a near infinity gravity. If there is an observer during the big bang, and the observer is within at the point which have the highest gravity, the observer will observe that it tooks longer for the big bang to happen and expand to bunch of galaxies than an observer who are outside the singularity's gravitational field, whom might observe the big bang happened and expanded to bunch of galaxies in just a few seconds.

We creatures on earth always uses our time scale to measure the age of universe. However, the universe is expanding from a state of high gravity, and each galaxy moves at different speeds and have different gravity, and even earth was rotating at different speed during its early birth, leading to inconsistent measurement of time across this period from big bang to today.

Or am I missing something?


mr wn said…
this of course leads to "Who's time is right here?"
And who else :D

p/s: glad to find another physics geek
forrest noble said…
Today the expansion of the universe that is used is thought to be the average expansion of the universe rather than a Hubble constant rate of expansion. This is because of the dark energy hypothesis ascribes to different expansion rates over time.

The time being used in the Hubble formula is Earth standard time. Expansion is measured by the distance per unit of time that galaxies are supposedly receding from each other via the expansion of space, or the expression of expansion via General Relativity.

According to the BB model if you follow this expansion rate backward in time you will end at a single point about 13.7 billion years ago ("Earth mean time"). This is the present model which relates to the meaning of time being used.

I do not ascribe to the standard model because I believe in a different explanation for redshifts other than a Doppler-like expansion of space. If interested see

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