The Komar mass (named after Arthur Komar) of a system is one of several formal concepts of mass that are used in general relativity. The Komar mass can be defined in any stationary spacetime, which is a spacetime in which all the metric can be written so that they are independent of time. Alternatively, a stationary spacetime can be defined as a spacetime which possesses a timelike Killing vector field.
The following discussion is an expanded and simplified version of the motivational treatment in (Wald, 1984, pg 288).
Read more about Komar Mass: Motivation, Komar Mass As Volume Integral - General Stationary Metric, Komar Mass As Surface Integral - General Stationary Metric
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“The mass of men lead lives of quiet desperation.”
—Henry David Thoreau (1817–1862)