Gravitational antiscreening in stellar interiors

Abstract

A new class of relativistic stellar structure equations which include the effects of an energy-dependent Newton coupling is presented. Significant modifications in the mass-radius relation for neutron stars are possible only if the running of the Newton coupling due to quantum gravity occurs at low energies. A new Buchdahl limit is derived and its physical implications are discussed. In particular, sub-Planckian self-gravitating objects with arbitrarily small radii are possible.

19 pages, 3 figures. V2: minor changes, references added. Matches published version

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• Phenomenological footprints of Lambda varying gravity theories inspired from quantum gravity models in the multi-messenger era