All Questions
19
questions
2
votes
1
answer
117
views
Can either of LISA, NanoGrav or LIGO measure the polarization of gravitational wave background (GWB)?
Polarization in GWB should carry as much important information as in CMB. However, I've done some superfluous literature research and found little discussion. Is there any planned project for ...
- 619
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
78
views
What does determine the frequency of gravitational waves caused by inflation?
It is theorized that during inflation gravitational waves are produced. See this article by Guzzetti, Bartolo, Liguori, and Matarrese (Cornell University). Or this one by Liu, Guo, Cai, and Shiu (...
2
votes
0
answers
113
views
Operatorial CTP / in-in formalism for sourced GW production?
Introduction / context -
The inflationary paradigm of modern cosmology is a very powerful and predictive framework in which we can trace the primordial cosmological perturbations as originated by zero-...
- 46
7
votes
1
answer
826
views
Damhsa Theory: Can gravitational waves really affect the long term climatic evolution of Earth?
As a glaciologist I'm often involved in topics related to the long-term climatic evolution of Earth, and to the factors that can trigger or end ice ages.
Recently, I came across the paper "Applying ...
- 228
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
2
votes
0
answers
97
views
Inflationary model that predicts both gravitational waves and isocurvature perturbations
I 'm searching for inflationary models that predict both gravitational waves and isocurvature (isothermal) perturbations.
If I understood well, de Sitter inflation predicts only curvature (adiabatic)...
- 41
1
vote
2
answers
123
views
What information about inflation could be gained from a measurement of the Cosmic Gravitational Wave Background?
I understand that inflation predicts that there is a primordial gravitational wave background due to quantum fluctuations in the gravitational field. Inflation is, of course, very important in terms ...
- 149
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
3
votes
0
answers
210
views
Is there any primordial gravitational wave(form) that could explain dark energy?
First, I asked myself the question:
Is there any gravitational waveform, however fantastical, that could explain dark energy.
I suppose for a ubiquitous gravitational wave to be an explanation for ...
- 341
5
votes
1
answer
575
views
Is inflation theory really dead?
I know the title is little bit challenging but maybe most of you heard about the last BICEP2 paper on February. As I have read about it here and here. My understanding is, BICEP2 results released on ...
- 1,151
2
votes
1
answer
77
views
Are there other places to look for the gravitational wave, other than space?
The recent BICEP2 announcements about the existence of gravity waves made the news, and made a big pitch for cosmic inflation, in the process they also claimed to detect the existence of gravitational ...
- 303
8
votes
0
answers
135
views
How do inflationary models predict the generation of gravitational waves during the inflationary period?
Recent results from the BICEP2 experiment have produced a lot of talk about the primordial gravitational waves produced during the inflationary period.
I would like to have some explanation about how ...
- 383
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
8
votes
1
answer
350
views
In the B mode power spectrum, what is the relationship between the multipole number and the wavelength of the seed gravitational waves?
One of the key datasets of the recent BICEP2 results is the B mode power spectrum shown below. The existence of these B modes implies the existence of gravitational waves prior to inflation.
My ...
- 7,063