What if Newton's Gravitational Constant was negative?

Understand

In this work, we seek a cosmological mechanism that may define the sign of the effective gravitational coupling constant, {\em 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 {\em G} into the positive branch of the evolution and further, that de Sitter inflation and a relaxation to General Relativity is easily attained.