Constraining a possible time-variation of the gravitational constant through "gravitochemical heating" of neutron stars

Astronomy and Astrophysics – Astronomy

Scientific paper

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Stars: Neutron, Dense Matter, Gravitation, Relativity, Pulsars: General, Pulsars: Individual (Psr J0437-4715), Ultraviolet: Stars

Scientific paper

A hypothetical time-variation of the gravitational constant G would produce gravitochemical heating of old (≳ 107-8 yr) neutron stars. It could produce detectable thermal ultraviolet emission from such stars for changes as small as |Ġ/G|~ 10-12 yr-1, comparable to the best existing upper limits from other methods.

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