Spontaneous violation of the energy conditions

Details Spontaneous violation of the energy conditions Spontaneous violation of the energy conditions

2004-01-24

arxiv.org/abs/astro-ph/0401521v1

Astrophys.J. 603 (2004) L133-L136

Astronomy and Astrophysics

Astrophysics

10 pages, 1 figure, accepted for publication in The Astrophysical Journal Letters

Scientific paper

10.1086/383145

A decade ago, it was shown that a wide class of scalar-tensor theories can pass very restrictive weak field tests of gravity and yet exhibit non-perturbative strong field deviations away from General Relativity. This phenomenon was called `Spontaneous Scalarization' and causes the (Einstein frame) scalar field inside a neutron star to rapidly become inhomogeneous once the star's mass increases above some critical value. For a star whose mass is below the threshold, the field is instead nearly uniform (a state which minimises the star's energy) and the configuration is similar to the General Relativity one. Here, we show that the spontaneous scalarization phenomenon is linked to another strong field effect: a spontaneous violation of the weak energy condition.

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