All Questions
7
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Time dilation between now vs right after the Big Bang should imply the universe is much older than 13.8 bn years? [duplicate]
The universe is said to be 13.8 bn years old. But if we go back in time towards the Big Bang singularity time will slow down more and more and eventually stop because of the density of the singularity....
- 11
0
votes
1
answer
110
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Cosmological time-dilation caused redshifting and photonic energy: Are Photon’s Energies Changed by Relativistic Transformations?
Amateur here, so go easy.
Given that cosmological time-dilation is the only GR-consistent reading of cosmological redshifting due to the accelerated expansion of space (due to the constancy of the ...
4
votes
3
answers
1k
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Does GR explain cosmological time dilation?
There is plenty of evidence for a cosmological time dilation effect. For instance a supernova that takes 20 days to decay will appear to take 40 days to decay when observed at redshift $z=1$ (see Ned ...
- 5,925
2
votes
2
answers
76
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Does Time Dilation apply to me when I'm outside the Hubble sphere?
Imagine that I'm at a fixed point on space outside the Hubble sphere. As the space outside the Hubble sphere expands faster than the people on Earth, I too should be moving away from you guys at the ...
- 119
1
vote
1
answer
100
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What is observed as rate of change of proper distance with time due to space-expansion to a binary star approaches, then exceeds the speed of light?
Aliens on planet M observe a binary star at distance D with a 10 day "clockwise" revolution period. All other massive objects are FAR away and can be ignored.
At time=0, the center of mass ...
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-3
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1
answer
149
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Expansion of what? [duplicate]
When people say "the expansion of the Universe" they seem to mean the expansion of the space between mass-dense regions. However, my understanding is that space and time are intrinsically linked, so ① ...
- 323
3
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5
answers
4k
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Time dilation of distant cosmic events. What is it?
I was reading the Wikipedia's page about "tired light", where we read that any alternative explanation to the observed redshift (described by Hubble's law) should be able to overcome several ...
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