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What if Newton’s Gravitational Constant Was Negative?

Departamento de Física and Instituto de Astrofísica e Ciências do Espaço, Faculdade de Ciências, Universidade de Lisboa, Edifício C8, Campo Grande, 1769-016 Lisboa, Portugal
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Galaxies 2019, 7(1), 38;
Received: 30 January 2019 / Revised: 7 March 2019 / Accepted: 11 March 2019 / Published: 18 March 2019
PDF [3791 KB, uploaded 18 March 2019]


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. View Full-Text
Keywords: gravitation; modified gravity; cosmology; variation of constants gravitation; modified gravity; cosmology; variation of constants

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Ayuso, I.; Mimoso, J.P.; Nunes, N.J. What if Newton’s Gravitational Constant Was Negative? Galaxies 2019, 7, 38.

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