All Questions
Tagged with cosmology gravitational-waves
82
questions
3
votes
2
answers
244
views
BICEP2 experiments
How was the polarization experimentally measured in the BICEP2 experiments and why did they look specifically at B-modes? Why is it implying the existence of gravitational waves and the need to ...
- 1,707
5
votes
1
answer
346
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What do the BICEP2 results mean for string gas cosmology and the ekpyrotic universe?
The imprint of gravitational waves created shortly after the big bang may offer direct evidence for inflation theory, according to a discovery by the BICEP2 experiment at the South Pole and released ...
- 904
9
votes
1
answer
1k
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What do the line segments on the BICEP2 B-mode polarization map mean?
The first image of BICEP2 visuals shows the "BICEP2 B-mode Signal", described as follows:
Gravitational waves from inflation generate a faint but distinctive
twisting pattern in the polarization ...
- 505
81
votes
6
answers
7k
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What was the major discovery on gravitational waves made March 17th, 2014, in the BICEP2 experiment?
The Harvard-Smithsonian Centre for Astrophysics held a press conference today to announce a major discovery relating to gravitational waves. What was their announcement, and what are the implications?
...
- 5,569
10
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2
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973
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Do photons and cosmic rays radiate energy through gravitational waves? If not, why not?
Due to the mass-energy equivalence, both matter and EM radiation bend spacetime, and both are capable of forming singularities (black hole, white hole/kugelblitz). In light of this, why do photons ...
user40753
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
3
votes
1
answer
228
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Thermal gravitational radiation and its detection
To my poor knowledge on the topic, the gravitational waves that are most likely to be detected by LIGO or other experiments do not have thermal spectrum. But I'm not certain.
I know that Hawking's ...
- 6,889