What if Newton’s Gravitational Constant Was Negative?

What if Newton’s Gravitational Constant Was Negative?

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 tha...

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Bibliographic Details
Main Authors: Ismael Ayuso, José P. Mimoso, Nelson J. Nunes
Format: Article
Language:English
Published: MDPI AG 2019-03-01
Series:Galaxies
Subjects:
gravitation
modified gravity
cosmology
variation of constants
Online Access:http://www.mdpi.com/2075-4434/7/1/38
Description
Summary: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.
ISSN:2075-4434

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