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In mathematical physics, the **Peres metric** is defined by the proper time

for any arbitrary function *f*. If *f* is a harmonic function with respect to *x* and *y*, then the corresponding Peres metric satisfies the Einstein field equations in vacuum. Such a metric is often studied in the context of gravitational waves. The metric is named for Israeli physicist Asher Peres, who first defined it in 1959.

- Peres, Asher (1959). "Some Gravitational Waves".
*Phys. Rev. Lett.***3**(12): 571–572. Bibcode:1959PhRvL...3..571P. doi:10.1103/PhysRevLett.3.571. Retrieved 27 April 2013.