All Questions
10
questions
0
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0
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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
1
vote
2
answers
383
views
Frequency sensitivity of gravitational wave interferometer with its armlength and with mass of the mergers
To the best of my knowledge, LIGO is capable of observing gravitational waves (GW) from stellar mass black hole (BH) mergers but not mergers of supermassive black holes. In order to detect the latter ...
- 26.8k
1
vote
0
answers
39
views
How are black hole masses calculated from gravitational waves? [duplicate]
I would like to know what data is used from gravitational wave detections to calculate black hole masses and how.
Also, what else can you deduce from gravitational wave detections? What was the exact ...
- 11
3
votes
1
answer
132
views
Determine expansion rate of universe from gravitational waves LIGO?
I heard on the TED Radio Hour that the LIGO team was able to make an independent measurement of the Hubble constant and the increasing expansion rate of the universe when they detected the ...
- 2,808
1
vote
1
answer
67
views
Where does the rate of mergers per halo in the "Did LIGO detect dark matter?" paper come from?
It was recently proposed that dark matter (DM) could be made of primordial black holes (PBHs) of $\sim 30 M_{\odot}$, like the first ones detected by LIGO. This idea was written in "Did LIGO detect ...
- 13
10
votes
1
answer
178
views
What LIGO should detect that it has not yet?
What would the lack of detection of such phenomena tell us about the Universe?
What should be the most frequent signals detected, theoretically speaking? I'm a lay person in the area, so you might ...
- 407
5
votes
3
answers
344
views
How would we estimate, ahead of time, "the chances" of LIGO spotting black holes colliding in the period that it has been operating? [duplicate]
Can anyone summarize calculations that have been done about the theoretical probability of a detectable black hole collision happening in the observable universe within the time that LIGO has been ...
- 1,272
15
votes
2
answers
841
views
Is there a Cosmic Gravitational Background Radiation (CGBR)?
The recent discovery by the LIGO made me wonder about this.
We know that there exists a CMBR, Cosmic Microwave Background Radiation, a blanket of electromagnetic energy covering the universe, made by ...
- 562
8
votes
1
answer
253
views
How many galaxies could be the source of the recent LIGO detection?
The recent LIGO detection is pretty exciting, and a lot of people are asking whether there is a chance of optical detection of the black hole pair that created the signal. From a cursory reading of ...
- 134k
3
votes
1
answer
228
views
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