Local selftuning mechanism for the cosmological constant
Abstract
Recently the global variation of the Planck mass in the general relativistic EinsteinHilbert action was proposed as a selftuning mechanism of the cosmological constant preventing vacuum energy from freely gravitating. We show that this global mechanism emerges for generic local scalartensor theories with additional coupling of the scalar field to the field strength of a threeform gauge field that turns the scalar field constant on the domain of the action. Evaluation of the resulting integral constraint equation over the observable Universe yields a selfconsistent framework with general relativistic field equations and arbitrary radiatively stable residual cosmological constant. We argue that the expectation value for this residual is in good agreement with the magnitude of the observed cosmic acceleration.
 Publication:

Physical Review D
 Pub Date:
 August 2020
 DOI:
 10.1103/PhysRevD.102.043506
 arXiv:
 arXiv:2003.04303
 Bibcode:
 2020PhRvD.102d3506S
 Keywords:

 General Relativity and Quantum Cosmology;
 Astrophysics  Cosmology and Nongalactic Astrophysics;
 High Energy Physics  Theory
 EPrint:
 14 pages