Questions tagged [ligo]

The Laser Interferometer Gravitational-Wave Observatory (short LIGO) is a large interferometer used for the detection of gravitational waves. Use this tag for questions about this specific installation; for questions more generally about the properties of gravitational waves or gravitation, use [gravitational-waves] and/or [general-relativity]

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aLIGO potential signals mimicking GWs not considered in the team publications? [closed]

[EDITED to accommodate info from the comments] Among the local atmospheric electromagnetic potential sources of a signal capable of mimicking the waveform of a GW not sufficiently considered by LIGO ...
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446 views

LIGO may have inadvertently detected the helioseismic burst from the Sun on 14 September 2015 [closed]

Here is a quote from an online article: "A gust is on the way. NOAA forecasters expect a stream of high-speed solar wind to reach Earth on Sept. 14th-15th, sparking renewed displays of high-latitude ...
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1answer
124 views

Gravitational waves veracity? [closed]

W/r to the recent announcement of gravitational wave detection, since the signal to noise ration appears to be about 3 to 1 (not really very good) and there is no collaborating evidence from neutrino ...
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1answer
59 views

Attributing Gravitational waves to a source

At a given time, there would be n number of binary neutron stars or Black Holes or even Super Novae, all of which would be leaving a gravitational wave imprint ..So how do LIGO scientists know which ...
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Is the LIGO detector acceptance different for gravitational and for non-gravitational waves?

The famous signals recorded by the LIGO observatories are characterized as observations of passing gravitational waves, where at each observatory site: Test masses are hung by wires near the vertex ...
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1answer
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Variability of the orbital inclination of a black hole merger?

How variable should we expect the orbital inclination of a typical black hole merger to be, relative to the galactic plane? The LIGO simulation seems to give the impression that the orbital ...
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1answer
169 views

What's the relationship between classical gravitational waves and gravitons? [duplicate]

LIGO have detected gravitational waves, why we are still far away from detecting gravitations? how to understand the statement below? A classical wave may be considered to be a coherent ...
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1answer
75 views

What does the presence of gravitational waves show? [duplicate]

Is the essence of the discovery of gravitational waves that we now know that gravity propagates through space at the speed of light and not instantly?
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Is it possible (either in practice or in principle) to produce images with a LIGO-type gravitational “telescope”?

I was reading an article in the newspaper today that referred to LIGO (and gravity-wave measurements in general) as "a new type of telescope". That got me thinking -- as I understand it, LIGO uses ...
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How can gravitational waves from such a long distance affect the beam of light?

Even if it does affect it should affect all the surrounding object making it impossible to detect any change. It would be like keeping a man and a scale in a room, and if a gravitational wave is ...
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What is tc time at coalescence, ϕc phase at coalescence given in this following question ?for LIGO Data

I Am new to LIGO data I was looking at the first solution for this question How were the solar masses and distance of the GW150914 merger event calculated from the signal? trying to reproduce a ...
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LIGO Gravitational waves detection [duplicate]

During the detection of gravitational waves by LIGO machine, why wasn't the laser light used in the detection, also stretched as a result of the stretching of space time fabric?
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Has there been any analysis on LIGO data looking for a 24 hour frequency?

The reason I ask this is because it seems like it would be a simple analysis to run with all the data we have and it would tell us if the land-based LIGO detectors pick up anything depending on our ...
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248 views

Producing an audible sound from the gravitational waves of the GW150914 event

As is said in the latest LIGO press realease, the detected gravitational waves vary with a frequency that is audible for us. The audio one can obtain from the detected data is actually plaied during ...
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1answer
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LIGO test masses in free fall

I know that the LIGO test masses are considered to be in free fall. However, they are supported by pendula. I thought that free fall means the only acting force is gravity - doesn't the tension in the ...
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1answer
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How much more precise would LIGO have to be?

The planets and a spinning black hole both drag their local frames and thus generate gravitational waves The amplitude should be proportional to the size of the celestial body, while the frequency of ...
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1answer
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Significance of the LIGO experiment with respect to length contraction

it might be best to first detail my (admittedly limited) understanding of the LIGO experiment. a beam of light is split along two 4Km evacuated pipes then reflected back where their interference ...
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Non-Planar Ring Oscillator in LIGO

How does total internal reflection from non-planar surfaces in an NPRO help eliminating standing wave and why a planar structure can't give the same result? I understand that to produce optical diode ...
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29 views

Simplified analytical model of LIGO signal

What is a simplified analytical model of the LIGO signal? It looks like a chirped sinusoid, but somewhat asymmetric. Wikipedia shows some pictures of these signals, but the signal model is generated ...
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1answer
44 views

Difference in Gravitational Waveforms for different objects?

This is an extension of one of my older questions: How would the gravitational strain waveform look like for a planet in orbit with a star? Let's say at some distance D there are two objects which ...
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1answer
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What information can we know by LIGO's detection of gravitational waves?

LIGO's detection of gravitational waves can help estimate Hubble's constant in a new way. Another paper might be informative. Apart from that what information can we get from the observed ...
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1answer
95 views

As a gravitational wave passes by a region, do the space-time dimensions undulate and move in a wavelike fashion?

As a gravitational wave passes by a region, do the space-time dimensions undulate and move in a wavelike fashion? Does LIGO measure the movement of the space-time dimensions as a gravitational wave ...
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1answer
129 views

If future measurements of black hole mergers will falsify general relativity, what other theory is there ready to be adopted?

In a recent paper from scientific american: https://www.scientificamerican.com/article/ligo-black-hole-echoes-hint-at-general-relativity-breakdown1/?wt.mc=SA_Twitter-Share it's said that general ...
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1answer
99 views

Why do LIGO use a quarter wavelength for detecting gravitational waves?

I have already researched into this and I am left slightly confused still. I have gathered that the use of a quarter wavelength is to turn a linearly polarised wave into a circularly polarised wave. ...
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192 views

Did the LIGO measure gravitomagnetic waves as well?

I think of gravitomagnetism as as the "magnetic" portion of gravity, with gravity being the "electric" portion. Since gravity ("electric") seems to affect space (which the LIGO could detect) what ...
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How can LIGO's measures be unequivocaly tied to gravitational waves? [duplicate]

I understand that there are 2 devices so that the signal cannot have a local stimulation as a source. But why couldn't it be seismic activity for instance? Given the accuracy of the devices couldn't ...
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1answer
111 views

What effect would GW150914 have had over a much shorter distance? [duplicate]

In the wake of the recent news of the confirmation of the existence on gravitational waves, I was discussing gravitational waves with a friend, and he asked whether this could potentially lead to some ...
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How far from the LIGO event would we have to be to hear it? [duplicate]

I imagine that at some optimum distance the gravitational waves would create compression and rarefaction waves in air sufficiently loud to be heard by the human ear. What is that distance? The ...
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1answer
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If light was 2 parts per trillion slower than gravitational waves, would we know this from Gauss' law? [duplicate]

In the recent neutron star merger. The gravitational waves started 100 seconds before the collision, which is when they reached a max and STOPPED. The mass quadrupole had stopped changing, which means ...
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385 views

How does LIGO detect Gravitational Waves if they bend both space and time?

Please note that this is not an inquiry into the mechanisms of technology that LIGO uses to detect gravitational waves. Also, I am not a flat-earther. I was watching physicists vs. flat-earthers ...
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1answer
461 views

Why does Ligo's second detection of gravitational waves and a black hole merger look absolutely nothing like the first? [closed]

Why does Ligo's reported second detection of gravitational waves and a black hole merger look absolutely nothing like the first detection announced in Februaray? Here is the data from the first LIGO ...
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380 views

Is it possible that a gravitational wave of spacetime hit the solar system? [closed]

I went (on vacation) to the beach, The sea was very calm (just like solar system) There was one person in a fishing boat, Suddenly a huge wave came to shore... Is it possible that a gravitational ...
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Could the September 2015 LIGO gravitational wave “detection” from “merging black holes” be fake? [closed]

The following Physical Review D article gives reasonable bounds for gravitational wave detection for Supernova core collapse. These bounds cannot be overwhelmingly different from the bounds on GW ...