All Questions
13
questions
11
votes
3
answers
2k
views
What would the wavelength of the Cosmic Background Gravitational Wave radiation be?
Considering electromagnetic CMB can only see light as old as 380,000 years after the Big Bang, whilst theoretically those being gravitational should be formed from the beginning, what would their ...
- 441
1
vote
1
answer
69
views
Gravitational analogue for Cosmic Microwave Background? [duplicate]
Penzias and Wilson famously discovered the CMB as a signal that they failed to be able to account for after removing all other known radio-sources. It's apparently close to the same strength in all ...
- 1,945
-5
votes
1
answer
72
views
Could gravitational waves give an illusion of an expanding universe? [closed]
Could the effect of “expanding” gravity (gravitational waves spreading at the speed of light) as it travels through space (and therefore becomes less local) red-shift all EM waves and thus give us ...
5
votes
1
answer
420
views
How much uncertainty has the relic graviton background?
In the paper [1], it is mentioned that inflation predicts that a relic graviton background is about 0.9 K (cf. cosmic neutrino background, 1.945 K, and cosmic microwave background, 2.73 K). How much ...
- 6,611
-1
votes
3
answers
69
views
Is the gravitational pull of the early ($10^{10}$ more massive) universe still observable?
During one of the early epochs of the universe it used to be 10^10 times more massive than it is now, just before the matter / antimatter annihilation. So what cosmic gravity is being asserted on the ...
- 214
1
vote
0
answers
140
views
Repulsive domain walls in gravity - current status of the field?
I know that in gravity domain-wall solutions are known to be repulsive. See e.g. this paper. Does anybody know anything about the current state of this field? It seems natural and appealing to try to ...
- 2,921
0
votes
1
answer
57
views
Do gravitational waves affect cosmic evolution?
If gravitational waves are not absorbed or captured by stars and planets and they keep on propagating through the universe, then it means that there must be a certain amount of gravitational energy ...
- 15.1k
2
votes
2
answers
148
views
Gravitational wave of Big bang? [duplicate]
Questions about the g-wave caused by the big bang:
1)was there a g-wave produced?
2) when will it reach us?
3) will it be too weak for us to detect(atleast now?)?
- 997
0
votes
1
answer
77
views
What are the implications of the LIGO results in reference to our current Cosmological models?
I was looking for some explicit information on the implications of the LIGO results or probing eras prior to the or near to the Big Bang singularity.
So, my question is therefore, what, if any, are ...
- 1,634
1
vote
2
answers
190
views
Is the expanding of the universe also a cause which can induce gravitational waves from mass? [duplicate]
Gravitational waves arises when mass is rotating in another mass'orbital, in explosions and of course in case of colliding black holes. But are they also created when mass is moving and speeding ...
- 3,348
0
votes
0
answers
86
views
Evidence of possible tidal effects close to a gravitational wave emitting system
Currently we are attempting to detect gravitational wave emissions using the LIGO gravitational wave detection system (and similiar systems), by attempting to detect very weak gravitational waves ...
user81619
5
votes
2
answers
446
views
gravitational waves and inflation theory
I am not a technical guy and I have no scientific knowloedge in physics but I have been reading books, watching videos in order to understand our cosmology and ...
- 185
3
votes
1
answer
230
views
variations of Einstein equations with conversion between gravitational and non-gravitational energy
I'm looking for existing papers studying a variation to Einstein equation that does not rely on the annoying matter conservation identity:
$$ T_{\mu \nu; \nu} = 0 $$
And instead tries to equate the ...
- 14.5k