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1answer
31 views

Graviational waves do travel faster than light!

Can someone explain to me why everybody on this post Do gravitational waves travel faster than light? says that gravitational waves travel at the speed of light? Let me give you my counter example. ...
-4
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1answer
16 views

Is LIGO One Laboratory or Two?

I argued that LIGO is one laboratory since both Livingston and Hanford are required to make one measurement. Therefore, the requirement of science for measurements to be repeated in more than one ...
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0answers
21 views

What are the wave characteristics for the detected gravity wave?

I'm curious to know what the amplitude and wavelength of the detected gravity waves are. The paper mentions some characteristics of the detection event, but not what that means for the wave itself. ...
3
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1answer
38 views

Does gravitational waves add mass to black hole?

Due to the recent discovery of gravitational waves by LIGO I was wondering suppose a black hole stood between a gravitational wave then due to the fact that black hole can attract every thing then ...
6
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1answer
42 views

Why gravitational waves are not produced by objects moving at constant velocity?

Gravitational wave is produced by change in gravitational field, source. If something is moving away from me at constant speed, its gravitational field will vary. But why only accelerating bodies ...
0
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0answers
13 views

Numerical simulation of strong field gravitational vacuum solutions colliding

I am interested in the current state of knowledge of strong field General Relativity learned from numerical investigations of gravitational wave packets colliding with each other or black holes. If ...
0
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1answer
45 views

How well can we localize gravitational wave sources?

A recent question cited a story about the recent gravitational wave detection saying that we can use the gravitational wave sensing to find supernova earlier in their process of collapse: [with ...
1
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1answer
118 views

Is it pure luck to observe a gravitational wave?

I actually have two questions: Since only a gravitational wave that is strong enough can be detected and the GW passes by the earth at light speed, can I say that we are lucky to detect one this ...
0
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1answer
28 views

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

Is the essence of the discovery of gravity waves that we now know that gravity propagates through space at the speed of light and not instantly?
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2answers
46 views

How does the $4$Km arms of LIGO measured so accurately?

The arms of the LIGO interferometer are $4$ Km long.Now,LIGO functions by measuring phase difference between two beams of light comming (as in Michaelson's Interferometer) to a sensitivity of ...
8
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1answer
275 views

Is there a “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 ...
2
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2answers
82 views

Gravitational Wave Impact

What would we see and feel if the waves were powerful enough? Do the waves influence whatever they pass through like a pressure wave would? Or would they be more transparent to the subject there ...
4
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1answer
48 views

Two naive questions about gravitational waves

My understanding of GW is that they ripple the fabric of the space-time just as accelerating charged particle emits electromagnetic radiation, accelerating massive objects produce gravitational ...
4
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1answer
39 views

Gravitational waves in other dimensions

I know this question is purely speculative, as we don't know if more dimensions do exist and also we do not know if gravity is indeed stronger in other dimensions (if they were to exist). But, one of ...
0
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1answer
39 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 gravity waves, I was discussing gravitational waves with a friend, and he asked whether this could potentially lead to some kind ...
2
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0answers
36 views

How LIGO is calibrated?

I think I have understood properly the principle of LIGO, however the sensitivty is around $10^{-18}m$ of accuracy of distorion. That looks pretty small... just starting with simpler phenomena, for ...
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2answers
119 views

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

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 ...
2
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1answer
94 views

How did the scientists know two black holes collided 1.3 billion years ago?

I saw a TEDx talk the previous day about the LIGO experiment and in that video he said they are waiting for the day Jan 1st 2017 for the Ripple in Gravity caused by two black holes colliding each ...
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0answers
29 views

Is the expanding of the universe also a cause which can induce gravitational waves from mass?

Gravitational waves arises when mass is rotating in another mass'orbital, in explosions and of course in case of colliding black holes. But are they also created when mass is moving and speeding ...
1
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2answers
46 views

Are gravitational waves effected by the curvature of space time (gravitational lensing)?

I have a basic question I can't seem to find anything on (I keep hearing about how gravity waves and gravitational lensing were both predicted by Einstein). We all know about the gravitational ...
3
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1answer
58 views

How did LIGO detect the source of the gravitational waves?

I read the newspaper today and I found that LIGO had detected gravitational waves. This is from their official website: For the first time, scientists have observed ripples in the fabric of ...
4
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0answers
60 views

How does LIGO reduce noise below what it is detecting?

LIGO is designed to detect changes in length on the order of 10,000ths the scale of a proton. I know they are extremely well isolated from their surroundings, but how could we even approach isolation ...
3
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0answers
71 views

Are gravitational waves dissipated and what is the mechanism?

I was amazed by the fact that we have been able to detect gravitational waves created thousands of year before they were observed. My surprise is that any wave phenomena I know it is always ...
0
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1answer
53 views

How much time distortion was caused by GW150914?

I understand (at least I think I understand) that LIGO used distortion of space to detect GW150914 (one arm grew longer, the other arm grew shorter, causing interference in the returning laser-pulse ...
0
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2answers
60 views

What was the frequency of the gravitational wave recently detected, and why?

In one early Internet post there was a graphic that appeared to show the gravitational wave (pulse) at about 30 cps. And another video it was stated that the gravitational wave would be as high as ...
0
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0answers
28 views

Do gravitational waves interact with the Earth's magnetic field?

Do gravitational waves cause a minor vibration of the Earth's magnetic field, and therefore a minor (if undetectable) electrical inductance?
1
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2answers
74 views

Could the LIGO in fact measure .. the expansion of the universe? What specifically is the numerical ratio of effects?

It would seem that LIGO measures wibbles in the metric (not manifold) of spacetime: How is it that distortions in space can be measured as distances? It would seem that the expansion of the universe ...
0
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0answers
34 views

Path of light and gravitational waves

Now that gravitational waves are detected, the way they are detected was using laser beams and they were out of phase when the return from the same trip distance. Does this means it is based on ...
2
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1answer
41 views

Is there any issue/concern for a slight wavelength shift of the laser light in the LIGO experiments?

A friend and I were having a discussion about the LIGO experiments and were wondering if there is any issue with the laser light undergoing a wavelength shift as a result of the gravitational wave? ...
0
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0answers
57 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 ...
4
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2answers
98 views

Do the photons emitted along with the gravitational waves take more time to reach earth than the ones emitted after them?

I'm puzzled because the gravitational waves do warp the spacetime locally. They do it continuously as they propagate. So the photons travelling in tandem with these waves must be constantly following ...
5
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1answer
51 views

Orientation of the LIGO Arms

The orientation of the interferometer arms at both sites are approximately Northeast-Southwest and Nortwest-Southeast, though I assume that, on account of the Earth's curvature, no pair of arms is ...
4
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2answers
80 views

Why do detectors for gravitational waves have only two perpendicular arms, not three?

I wonder why detectors for gravitational waves have only two perpendicular arms, not three. Having three arms appears to allow for better detection of direction, or may even increase sensitivity (I ...
8
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1answer
69 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 ...
3
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2answers
91 views

Does wave-particle duality exist for gravitational waves?

For electromagnetic waves there exists a wave/particle duality: light sometimes behaves as a wave, and other times as a particle (photons). Does such a duality exist for gravitational waves? In other ...
1
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2answers
89 views

How were the solar masses and distance of the GW150914 merger event calculated from the signal?

The GW150914 signal was observed, giving us the frequency and amplitude of the event. Because LIGO has two detectors a rough source location could be derived. But how do these three factors allow for ...
2
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1answer
66 views

Where does gravitational waves' energy go?

Following the measurement of gravitational waves, many sources described them and explained they carry energy away. What I don't get is how this energy will get transfered back to anything else. If ...
2
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2answers
49 views

Can we see the famous black hole pair or its effect on other stars in any other means but LIGO?

If the source of LIGO's detection is a pair of black holes, can we see them using a traditional electromagnetic/neutrino/some other kind of telescope? Or can we see their effect on other stars in ...
0
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1answer
88 views

LIGO discovery: if the space “time” metric is changed, how is it measured? [duplicate]

Regarding the wonderful 2016 news about gravitational waves. Travel time in one arm of the LIGO is ~ 30μs. A gravitational wave affects the arm for some few hundred of these laps. Then for example ...
2
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2answers
152 views

Could discovered gravitational waves in fact be an aether wind? [duplicate]

Proving the existence of gravitational waves might revolutionise cosmology, but the method used by LIGO is quite similar to the famous Michelson-Morely interferometer built more than a hundred years ...
0
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4answers
183 views
0
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0answers
41 views

How do gravitational waves and black holes interact?

Following the first detection of gravitational waves yesterday (11 Feb. 2016) by LIGO, I have a couple of questions about how gravitational waves and black holes interact. Assume that there is a ...
2
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0answers
56 views

Now that gravitational waves have been discovered, what does their particle version look like? [duplicate]

Duality dictates that gravitational waves should have a particle counterpart too, right? Will this in any way help solve the big problem of quantum gravity?
1
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0answers
28 views

What is the effect of gravitational waves on time? [duplicate]

I always struggle with the time concept when it comes to general relativity. In the recent discovery the gravitational waves have been detected by the "displacement" of the mirrors and the difference ...
2
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1answer
46 views

In GR what is a “source-frame mass”?

In the recent LIGO paper, "GW150914: First results from the search for binary black hole coalescence with Advanced LIGO, (LIGO Scientific Collaboration and Virgo Collaboration)", they refer to the ...
0
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1answer
65 views

How much force is required to produce a noticeable gravitational wave?

By noticeable, I do not mean noticeable from half way across the galaxy to our observatories, but noticeable as in, if there were an object with enough mass and energy within say, the distance of our ...
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4answers
6k views

Do gravitational waves travel faster than light?

In Feb 12, 2016 edition of Times of India, an article read [with the discovery of gravitational waves, we will be able to] Track Supernovas hours before they're visible to any telescope because ...
0
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2answers
63 views

Is there a connection between Space-Time Vortex and Gravitational Waves?

Is there a connection between Space-Time Vortex and gravitational waves? Space-Time Vortex
2
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1answer
104 views

How does LIGO account for curvature of Earth?

Using an earth curvature calculator, I found that at a distance of 4 km (the length of LIGO's arms), more 1.26 m is hidden by the horizon. When constructing LIGO, did they account for the curvature of ...
4
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1answer
83 views

Why are Gravitational Waves so small?

I'm sure you've all seen the diagrams and/or 3D visualizations of gravity; the ball sitting on a piece of fabric which makes it sink down. They've also started using it in the videos that explain ...