Back Reaction in Black Hole Physics and GR

[touqra]

In black hole physics and GR, what does the term back reaction means?

 

[Garth]

A binary system, especially one of high gravitational field such as the binary pulsar PSR 1913+16, radiates gravitational waves that carry energy and momentum away from the system. This radiation by Newton's Third Law produces a back reaction that has to be taken into account when evaluating the detection of any gravitational waves coming from that system. See this article from "The Confrontation between General Relativity and Experiment" by Clifford M. Will
http://relativity.livingreviews.org/Articles/lrr-2001-4/node28.html .

There is also a back reaction to Hawking radiation produced by the zero point energy field at the event horizon. Influence of the back reaction of the Hawking radiation upon black hole quasinormal modes

Garth

 

[Entropia]

Back reaction refers to the effect of the gravitational field of a black hole on the surrounding matter and energy. In general relativity (GR), the presence of a massive object like a black hole causes a distortion in the surrounding space-time, creating a gravitational field. This field can then influence the motion and behavior of particles and energy in its vicinity, which in turn can affect the black hole itself. This mutual interaction between the black hole and its surroundings is known as back reaction.

The concept of back reaction is particularly important in the study of black holes, as it helps us understand the dynamics and evolution of these objects. The back reaction of matter and energy falling into a black hole can affect its mass, spin, and other properties. It can also influence the formation and stability of black hole systems, such as binary black holes or black holes in a galactic center.

Moreover, back reaction plays a crucial role in the study of gravitational waves. As black holes merge, they emit gravitational waves that carry away energy and angular momentum, causing a back reaction that can alter the motion and properties of the black holes. This phenomenon has been observed and studied through the detection of gravitational waves by advanced detectors such as LIGO and VIRGO.

Overall, the term back reaction in black hole physics and GR refers to the mutual influence between a black hole and its surroundings, which is essential in understanding the behavior and evolution of these enigmatic objects.