Geroch energy

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The Geroch energy or Geroch mass is one of the possible definitions of mass in general relativity. It can be derived from the Hawking energy, itself a measure of the bending of ingoing and outgoing rays of light that are orthogonal to a 2-sphere surrounding the region of space whose mass is to be defined, by leaving out certain (positive) terms related to the sphere's external and internal curvature.

[edit] See also

• Mass in general relativity

[edit] References

• Section 6.2 in Szabados, László B. (2004), “Quasi-Local Energy-Momentum and Angular Momentum in GR”, Living Rev. Relativity 7, <http://www.livingreviews.org/lrr-2004-4>. Retrieved on 23 August 2007