# Tag Info

### Could the human body feel the sudden disappearance or end of a gravitational force?

Firstly, the sun can't just "disappear". Even if it were converted by magic into "pure energy", that energy can't go anywhere faster than the speed of light, and Energy has ...
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### Do tidal forces on moons cause them to emit gravitational waves?

Yes, but the effect is tiny Tim Rias (in a comment below) calculates it to be $10^{-18}$ Watts. (see a paper about doing a similar calculation for neutron stars) Bodies that have spherically ...
• 116k

### Are gravitational waves emitted equally in all directions?

The gravitational wave strain is not isotropic. More power is emitted (per unit solid angle) along the orbital axis of the binary than in the orbital plane. For a circular orbit (and they tend to be ...
• 146k

### Why do we say that gravitational waves travel at the speed of light, when they can escape a black hole and light cannot?

Gravitional waves CAN'T escape a black hole; nothing that carries information can escape. The event Horizon is one way. The gravitational waves don't come from the singularity but instead come from ...
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Accepted

### Joseph Weber's aluminum cylinder

The concept of the "resonant bar" detector for gravitational waves is that you get your cylinder of material to oscillate at its resonant frequency when pinged by a gravitational wave source....
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### A mysterious signal at 14.2054 µHz

No, because the strain amplitude from this binary is vanishingly small compared with variations in atmospheric pressure due to a variety of mechanisms at frequencies similar to the expected frequency ...
• 146k

### Radiation pattern of a GW source

Gravitational waves are tensor modes that are, in general, a mixture of two orthogonal polarisation states known as plus and cross. By analogy with electromagnetic waves, you can refer to a wave ...
• 146k
Accepted

### Gravitational wave for Solo mass system

Suppose you have a mass $m$ moving up and down along the z-axis according to: $$z(t) = A \cos\omega t$$ The traceless part of the quadrople moment tensor then has components \begin{align} I_{xx}^T &...
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### Is it possible to detect gravitational lensing of both light and gravitational waves originating from the same event?

Yes; typically, if the light is lensed, the gravitational waves are also lensed, and vice versa. The main exception is if the lens is small. The current observatories, LIGO/Virgo/KAGRA, are sensitive ...
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### How far can a gravitational-wave pass through space?

Till infinity Your question is based on the false premise that gravitational waves require energy to propagate through space and after a certain distance, the waves lose energy and disappear, which is ...
• 2,585

### Gravitational wave intereference

Gravitational waves are small perturbations in the spacetime metric caused by specific types of acceleration by masses. The gravitational attraction between masses is always present, regardless of ...
• 146k
Accepted

### What is the formula that shows that gravitational waves can carry information and data?

Obviously they can, in the sense that at least the presence or absence of a gravitational wave can be detected. Hence you could send information by generating one or not, for example by either ...
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Accepted

### Do collisions of stars still undergoing fusion reactions produce gravitational waves?

Although any binary pair of bodies will produce gravitational radiation, our current technology is only able to detect very powerful source of GW radiation. When a pair of black holes are in their ...
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### When gravitational waves pass through a star or gas cloud do they cause mixing of plasma and gas?

The strain of typical gravitational waves from black hole mergers is on the order of $10^{-21}$. This means that a length of 1000km is compressed and stretched by about the size of one proton. That is ...
• 116k
Accepted

### How far can a gravitational-wave pass through space?

In addition to the decrease in the vacuum due exclusively to the distance from the source of the gravitational wave, the gravitational wave undergoes an additional damping when it passes through ...
• 1,720

### Are gravitational waves emitted equally in all directions?

As a supplement to @ProfRob's answer. The answer there only takes into account the leading order contribution coming from $\ell=m=2$ quadrupole mode. For binaries that are far from merger, and merging ...
• 2,511

### Gravitational waves vs. "normal gravity"

Acceleration isn't a property of spacetime per se. Two test particles at the same location can have different instantaneous accelerations, so just knowing that there is a passing gravitational wave ...
• 3,498

### Could the revolution of super-massive black holes around each other create a pulsar-array gravitational wave signal despite 'final parsec' problem?

TL;DR: We do have gravitational wave emission from supermassive black hole binaries (SMBHBs) at larger separations, but a background created from solely those binaries won't have the characteristic ...
• 36k

### Do all orbits emit gravitational waves?

All orbits as you would normally think of them emit gravitational waves. You mention an axially symmetric orbit. A hypothetical rotating rigid hoop would not, since the distribution of mass is not ...
• 3,689
Accepted

### bent space-time by Energy can radiate gravitational-wave?

General relativity makes no distinction between "mass" and "energy". Mass is just one form of energy, a form that happens to be intrinsic to certain particles. For example, a ...
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### Effect of a passing gravitational wave

I suspect you still haven't clarified your question sufficiently. Gravitational waves are transverse so there is no stretching and compression in the direction they are propagating.
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### Gravitational-Wave Strain and Power (watt/square metre)

As explained in the thread How does the gravitational wave strain from a rotating binary depend on the chirp mass, frequency and distance & what a short derivation looks like? If $m_1$ and $m_2$ ...
• 1,720

### From where does the energy for gravitational waves come from?

Two black holes starting far apart have gravitational masses $M_1$ and $M_2$ (i.e. the masses you would put into the formulae for their Schwarzschild radii). When they merge they form a black hole ...
• 146k

### Do tidal forces on moons cause them to emit gravitational waves?

While JamesK's answer works hard and goes to great effort to emphasize that the effect is really small, so as to dismiss the effect as (humorous hat tip to Douglas Adams): The effect is small, You ...
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### Could the human body feel the sudden disappearance or end of a gravitational force?

No, the human body couldn't practically feel the sudden disappearance of a gravitational force Humans are able to feel because different accelerations applied to different parts of the body cause it ...
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