Galaxies (Mar 2019)

What if Newton’s Gravitational Constant Was Negative?

  • Ismael Ayuso,
  • José P. Mimoso,
  • Nelson J. Nunes

DOI
https://doi.org/10.3390/galaxies7010038
Journal volume & issue
Vol. 7, no. 1
p. 38

Abstract

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In this work, we seek a cosmological mechanism that may define the sign of the effective gravitational coupling constant, G. To this end, we consider general scalar-tensor gravity theories as they provide the field theory natural framework for the variation of the gravitational coupling. We find that models with a quadratic potential naturally stabilize the value of G into the positive branch of the evolution and further, that de Sitter inflation and a relaxation to General Relativity is easily attained.

Keywords