All Questions
Tagged with cosmology gravitational-waves
82
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The data file of the LISA Interferometer results
How to extract the data of the strain versus frequency plot of the Laser Interferometer Space Antenna (LISA): Figure (2) in this paper:
https://arxiv.org/abs/1702.00786
The paper doesn't contain any ...
- 395
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25
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How to plot the curve of the gravitational wave energy density giving the data of the strain versus frequency
I want to plot the curve of energy density ($\Omega$) of the gravitational waves versus frequency that are predicted by the Einstein telescope. But in the ET pages:
https://moscow.sci-hub.se/4444/...
- 395
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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
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Thermal models of gravitational radiation?
How is the background noise of gravitational waves modeled? Is it a thermal model, giving a stochastic distribution of the curvature tensor (field-strength tensor) in ambient space? That is, every ...
- 241
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2
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Gravitons in a vacuum
I'm new so please be nice if I don't know too much about anything.
I was kind of curious about the idea of gravitons in a vacuum. (using string theory, or even superstring theory.) if space is a near-...
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Number of gravitational wave events needed to calculate Hubble parameter
How many GW events do we need to measure the Hubble parameter with a precision 1-5%? How do we calculate that number?
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Can gravitational waves gain energy in an expanding FRW spacetime?
I was reading this paper (Green's functions for gravitational waves in FRW spacetimes: https://arxiv.org/abs/gr-qc/9309025) I had a specific question about one statement in the paper that I would like ...
- 2,466
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137
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*Observational* Consequences of Energy Nonconservation in GR
What are the experimental or rather observable consequences of the non-conservation (or conservation) of energy in GR? Imagine our instruments were $10^3$ or even $10^6$ more sensitive, better ...
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Could gravitational waves be cosmologicaly 'redshifted'? [duplicate]
Is it posible that gravitational waves detected here on Earth could be cosmologicaly 'redshifted'? So, at emission they had higher frequency then after reaching Earth?
- 2,245
3
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LIGO et al: Is it possible to estimate the frequency of GW+EM detections?
In the past few years LIGO and VIRGO have detected a multitude of gravitational events. As far as I know however only GW170817 had a verifiable EM counterpart. Shouldn't it be possible, based on ...
- 1,093
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Faster-than-light gravitational waves and faster-than-light expansion in the inflation
I have no introduction to the inflationary epoch. I know, however, that during this time space-time expanded with a speed faster than the speed of light. If gravitational waves are perturbations of ...
- 585
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Is it possible to block a gravitational wave?
As John Micheal Godier states in this video: SETI and Alien Quantum Communications.
Alien civilizations might use different methods of communication beyond radio for several reasons.
J.M.G uses ...
- 441
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59
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Rotating binaries viewing geometry
I am reading this article
and looking at eq. (4). I am not sure how the expressions in terms of the viewing angle $\iota$ and the phase $\Phi$ are achieved. It looks to me like it has nothing to do ...
- 45
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2
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444
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Which is the total energy density constraint for the gravitational wave background?
Different constraints from different measuring methods have been set on different frequency ranges of the energy density of gravitational waves, as shown in the picture below. What is the total energy ...
- 466
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3
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Can the expansion of the Universe be explained by a giant gravitational wave? [closed]
Can the expansion of the Universe be explained by a giant gravitational wave with a wavelength bigger than observable Universe's diameter? In that case the expansion would be temporary, only happening ...
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