All Questions
5
questions
1
vote
2
answers
76
views
What difference does the wavelength and/or frequency of a gravitational wave make? On the detector, for instance?
When they talk about the arms of LIGO or Virgo stretching by a thousandth of the width of a proton, they always emphasize that this is the wave's amplitude, not wavelength...
The wavelengths are ...
- 4,509
0
votes
1
answer
54
views
Observational evidences of the early universe other than CMB
CMB is a great experimental evidence that the universe was once in an hot themal phase at early times. Supposing all the CMB observations failed for tecnical reason (for example the rocket shipping ...
- 505
16
votes
3
answers
1k
views
What is the most compelling evidence of General Relativity in the presence of matter and energy?
The most oft-cited triumphs of GR are things such as the shifting perihelion of Mercury, gravitational redshift experiments, and gravitational lensing. But, as far as I know, these are only ...
- 2,046
1
vote
1
answer
82
views
Data/signal from a black hole to observe a singularity
I wonder if a situation is possible where, we measure some signal/property concerning a black hole. Supposing the measurement we make with some telescope, gets us the Fourier transform coefficients of ...
- 2,152
9
votes
1
answer
1k
views
What are the different ways to measure the spatial curvature of the universe?
Just what the question asks. Assuming the Friedmann-Rovertson-Walker (FRW) metric, what measurements can be performed to determine the spatial curvature of the universe.
- 3,492