When a supernova occurs is it expected that the gravity wave

[wolram]

When a supernova occurs is it expected that the gravity wave will reach a point at the same time as the light?

 

[vincentm]

electromagnetic force has some similarities to the gravitational force.

Modern Physics has now accepted something known as the Standard Model as a description of all fundamental particles and three of the four fundamental forces that act between these particles (electromagnetism, weak nuclear force, strong nuclear force). The model regards all forces as being 'transmitted' by a type of particle known as bosons, which are exchanged between particles in order to transmit a force.

The Standard Model regards all electromagnetic radiation, which comprises the 'electromagnetic spectrum' and is responsible for the electromagnetic force, as consisting of discrete quanta (particles) known as photons. These photons have a number of distinguishing properties.

Equally, although the Standard Model does not formally include gravity, it is currently accepted that the gravitational force must be transmitted in the same way as the other forces. The boson responsible has become known as the graviton, and again has a number of distinguishing properties. The reason for any uncertainty and assumption here is because the graviton is yet to be observed (this would be expected because gravity is by far the weakest force, making the graviton most difficult to observe).

By comparing the fundamental properties of these bosons, it is clear that photons and gravitons are different, although they do share some of the same properties.

Source

 

[marcus]

When a supernova occurs is it expected that the gravity wave will reach a point at the same time as the light?

I think so. Approximately.
In everything I've read it's assumed that gravity waves travel at the same speed as light.
It's odd that gravity waves haven't been observed yet, though.

I would imagine that if gravity waves associated with various sorts of supernovae are observed, there may be differences in the arrival times of the signals, stemming from delays at the source. Even if, as I assume, the signals travel at the same speed thru empty space.

It takes the light a while to emerge. The gravity wave signaling the collapse might conceivably get here before the flash.

I was looking at the lightcurves of supernovae a while back and noticed that in some cases it takes several days for the visible brightness to build up. maybe someone can summarize the situation. In that case, we could get a gravity wave signal from the collapse immediately (if it was detectable) and then over the course of the next minutes or hours, or even days, see the light build up.

 

[smallphi]

An exact spherical collapse or explosion, no matter how intense, does not produce gravitational wave. Only deviations from spherical symmetry do and if those deviations are 'small' in some sense, that would explain why the produced wave is not as spectacular as the light wave and hence below our sensitivity of detection.