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1answer
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light gravitational wave interaction

What happens when light photos and gravitation waves collide? Like can the photon "surf" on the gravitational wave and change direction, wavelength, velocity?
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1answer
60 views

LIGO detection: What do we know about the black hole system?

I would to know how much we can infer from the LIGO detection on the black hole system. I understand that at least the following can be verified: Spins Inclination Initial masses Final masses ...
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2answers
1k views

Why there is no dipole gravitational wave?

I have read that "thanks to conservation of momentum" there is no dipole gravitational radiation. I am confused about this, since I cannot see the difference with e.m. radiation. Is this due to the ...
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0answers
74 views

Non-locality of gravitational energy

Gravitational energy is non-local which is essentially because of the equivalence principle. The equivalence principle says that you can always transform your frame so that you feel like in a ...
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0answers
125 views

Do photons generate gravitational waves since they affect with their energy the stress tensor?

The gravitational waves are fact. They are produced in a way predicted 100 years before by Einstein. Anything with energy affecting stress tensor of space time produces them. What does it happen with ...
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3answers
185 views

Can we detect gravitational waves generated from inside the event horizon of a black hole? [duplicate]

General relativity prevents light from escaping a black hole, but does it also apply to gravitational waves?
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0answers
43 views

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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0answers
52 views

LIGO detection statistic, SNR formula

According to B. P. Abbott paper published in Physical Review Letters, "Observation of Gravitational Waves from a Binary Black Hole Merger" ...
1
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1answer
114 views

What are gravitational waves relative to? [closed]

I have been having trouble picturing what kind of waves say Sun and Earth would make. Looking from top perspective Sun is in the middle and denting space while Earth is moving which is also denting ...
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0answers
43 views

How far gravitational waves like the ones recently detecty are dangerous for life? [duplicate]

I have read that gravitational waves can tear matter appart. I imagine you have to be fairly close to the event to be affected. Do we have a rough estimation of lethal distance ?
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1answer
92 views

Is there a path to go from GR, to Gravitational Waves, to Gravitational Particles (Gravitons), to Quantum Gravity?

The articles on the subject often say : a part of the mass of the 2 celestial bodies became energy for gravitational waves after merging : E(gravity waves) = (M1 + M2 - M_merged).c^2 Intuitively I ...
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0answers
36 views

Does the gravitational wave community plan to lower the threshold for claiming detections by 2000x?

I've read: To investigate the impact of reducing the parameter space for GRB searches, we will deliberately avoid the question of first gravitational wave detection - where a "5-sigma" ...
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0answers
13 views

How does gravitational waves interact with each other [duplicate]

With my limited knowledge in physics, I assume gravitational waves behave like the waves we know. If this assumption is true, how will they act when ripples go through each other? Will they cancel ...
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0answers
22 views

Gravitational Ripples [duplicate]

Recently the observance of Gravitational Ripples was reported using the LIGO detector. LIGO consists of two arms perpendicular to each other through which a split laser beam is passed and then ...
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0answers
63 views

Which formula was used to get Gravitational Waves animation?

I would like to make animation like this by myself It is from wikipedia article "Gravitational wave". But if I use formula from wikipedia article "Gravitational wave" subsection "7.2.2 Wave ...
0
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1answer
83 views

What field property may allow faster than $c$ speed?

What field property may allow faster than $c$ speed? Is there theoretical field or what property it needs to have to allow wave speed larger than $c$? What is the speed of the gravitational wave? Is ...
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3answers
105 views

Would the uncertainty principle apply to gravitational waves?

The uncertainty principle is one of the most basic rules of quantum mechanics, but Quantum mechanics still has not been unified with general relativity, so would the uncertainty principle apply to ...
2
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1answer
63 views

Gravitational waves induce changes in the $h_{00}$ (time) component of the metric?

I'm rather stumped by a subtle point regarding metric perturbations of GW. I'm well aware the GW are able to produce changes in the flat space metric, They are transverse and have planes of ...
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1answer
69 views

LIGO: Importance of photons

In LIGO, a photon beam travels in two perpendicular direction and time taken by each beam is noted. Non zero time difference is a signature of GWs here. What if I use electron beam travelling at ...
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0answers
62 views

Do gravitational waves contain actual energy and momentum? [closed]

Gravitational waves are waves in the fabric of space time and gravity is also caused by warped space time. So do gravitational waves contain actual energy and momentum?
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0answers
54 views

Gravitational Waves + impedance

Why isn't there an Impedance with gravitational waves? http://www.scientificamerican.com/video/gravitational-waves-are-the-ringing-of-spacetime/
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1answer
55 views

Turbulence in gravitational waves

I want to understand physical meaning and possible implications of few terms often used in physics specially with regards to gravitational waves / space-time fabric Space-time fabric is disturbed by ...
1
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1answer
79 views

Neutrinos are slower than gravitational waves according to their mass?

Neutrino bursts are observed before the visible light of supernovas, most famously SN 1987A. Astronomers likewise expect gravitational waves. Gravitational waves are supposed to travel at exactly the ...
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1answer
27 views

How is light used to measure the change in time caused by gravity?

Is the following analogy correct, if not- what changes are necessary to correct it? Let's consider a guy riding on a photon with a clock, and every time his clock ticks he paints a dot. Let's also ...
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2answers
84 views

How does some of the black hole (BH) mass escape the event horizon (EH) of either BH, or the merged EH of two merged BHs?

BH mass is a conserved quantity and cannot escape the horizon of a BH. Yet in mergers some percent (in GW150914 it was about 5 percent, or 3 solar masses) of the binary's mass escaped either before ...
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3answers
218 views

Meaning of $5.1\sigma$ significance with regards to GW150914

I couldn't find any publication by LIGO that explains how we should interpret this value. The closest I have found is the following quote: This means that a noise event mimicking GW150914 would be ...
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2answers
76 views

How does gravitational wave compress space time?

My question came from the talk of how gravitational wave stretches and compresses space time. Say there are two protons that are 1 centimeters apart, as a G-wave passes through them, would the ...
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1answer
57 views

Vibrating black holes

From http://ligo.org/science/Publication-S5S6RD/index.php "Every star in the universe vibrates or oscillates in some manner. Turbulence on the surface of the Sun causes well-known solar oscillations ...
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1answer
84 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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2answers
184 views

Why does LIGO have an arm length of few kilometers? Is the distance dependent on Gravitational Wave wavelength?

Antennas for capturing radio waves need to have $\frac{\lambda}{2}$ length for optimum reception of signal. Does it imply LIGO arm length is $\frac{\lambda}{2}$ of Gravitational Wave it is trying to ...
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2answers
91 views

About the working of LIGO [closed]

How is it that the gravitational wave occurred exactly so as to compress one tunnel and expand the other one( as is inferred from the explanations they Caltech gives)? Or is LIGO built in a way that ...
4
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1answer
105 views

What was the rate of Black Hole - Black Hole mergers expected to be detected by LIGO prior to GW150914?

My question is a more detailed version of the one found here, which elicited some good information but the question was never really answered. From table 4 in a 2010 paper we see the estimated rate ...
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0answers
58 views

Do gravitational waves have field components like electromagnetic waves?

One way I've been led to understand electromagnetic waves (and I accept that this might be a misconception I have) is that they 'self propagate' through empty space by virtue of the wave consisting of ...
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1answer
212 views

Could the September 2015 LIGO gravity 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 ...
2
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1answer
74 views

How they can estimate when the black holes collided in the recent LIGO discovery? [duplicate]

How they can estimate when the black holes collided in the recent LIGO discovery? If LIGO can detect ripples in the gravitational waves, how they can figure out how old those waves are? Surely ...
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4answers
148 views

Is the energy released by gravitional waves kinetic energy or converted rest mass?

It is said that at the binary black hole collision LIGO detected recently, the energy equivalent of 3 solar masses has been released. Since no matter can escape a black hole, the only source I can ...
3
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1answer
200 views

Is the GW150914 signal consistent with a superluminal gravity wave burst?

I've been following the news about the detection of gravity waves with interest and had a question for those with a physics background. I've gathered that the preferred explanation for GW150914 (Fig ...
3
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2answers
59 views

what's the connection, if any, between the graviton and the newly detected gravitational waves?

Is there any connection between the graviton, which is listed as a hypothetical particle, and the newly detected gravitational waves?
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3answers
80 views

Effect of Gravitational Waves on light?

We all know about the gravitational lensing effect. From the analogy of fabric of space time used to explain this concept to laymen like me, i understand that light follows the curvature of spacetime. ...
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2answers
78 views

Can a system be engineered to cause a standing wave resonance with gravity waves? [closed]

Thank you Docscience for helping me adjust my question in a better direction. My interest has been sparked by getting Into the chapter of waves in physics class and of course the new discovery of ...
2
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1answer
160 views

Does LIGO GW detection methodologically constitute discovery of two specific black holes (as astronomical objects)? [duplicate]

It is said that the gravitational waves (GW), recently detected by LIGO, correspond (according to Einstein General Relativity theory equations) to the effect of two black holes merging (with the ...
2
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1answer
54 views

Is gravitational wave affected by gravitational field [duplicate]

Does gravitational wave show gravitational lensing? Does it bend around mass?
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1answer
81 views

Do/Would Gravitational Waves have these properties? [closed]

I haven't done a ton of research on Gravitational Waves, but I have done some theorizing. Are these properties confirmed (by theory or observation) characteristics of GW? Gravitational Waves travel ...
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0answers
55 views

If we were orbiting the two black holes that LIGO detected, would anyone notice?

The two black holes that merged released an ENORMOUS amount of gravitational energy. According to National Geographic this was: In the last second before the black holes merged, they released 50 ...
0
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1answer
105 views

How can gravitational waves be detected when spacetime bends the instruments? [duplicate]

Apologies for the naive question, hoping someone with a proper physics background can explain this in layman's terms (as opposed to the more detailed answers at LIGO flawed by the identical expansion ...
2
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0answers
47 views

Have gravitational waves any effect on the electromagnetic waves in interferometers?

I am not into general relativity, but the explanation of how an interferometric gravitational antenna works is generally pretty basic. In the recently published paper announcing the detection of ...
3
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3answers
92 views

Earth's gravitational waves? Measurable?

Why don't they measure Earth's gravitational waves which has stronger effect holding us on planet and sounds to me maybe stronger instead of measuring far black hole mass created wave 1/1000th of ...
2
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2answers
63 views

Gravitational wave of Big bang? [duplicate]

Questions about the g-wave caused by the big bang: 1)was there a g-wave produced? 2) when will it reach us? 3) will it be too weak for us to detect(atleast now?)?
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0answers
45 views

Do gravitational waves produce real accelerations?

Do gravitational waves produce real accelerations? For example, if I have an electron and a gravitational wave passes by, will the electron emit electromagnetic waves according for instance to Larmor ...
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3answers
4k views

Can gravitational wave be used for data transmission?

Imagine an advanced civilization which can manipulate gravity like we manipulate electromagnetic radiation. Could they already be using gravitational waves for data transmission across different ...