Robustness of the Cosmological Constant Damping Mechanism Through Matter Eras. (arXiv:2010.05927v2 [gr-qc] UPDATED)
<a href="http://arxiv.org/find/gr-qc/1/au:+Evnin_O/0/1/0/all/0/1">Oleg Evnin</a>, <a href="http://arxiv.org/find/gr-qc/1/au:+Massart_V/0/1/0/all/0/1">Victor Massart</a>, <a href="http://arxiv.org/find/gr-qc/1/au:+Nguyen_K/0/1/0/all/0/1">Kevin Nguyen</a>
A dynamical resolution to the cosmological constant fine-tuning problem has
been previously put forward, based on a scalar-tensor gravitational theory
possessing de Sitter attractor solutions characterized by a small Hubble
expansion rate, irrespective of an initially large vacuum energy. We show that
a technically natural subregion of the parameter space yields a cosmological
evolution through radiation- and matter-dominated eras that is essentially
indistinguishable from that predicted by General Relativity. Similarly, the
proposed model automatically satisfies the observational constraints on a fifth
force mediated by the new scalar degree of freedom.
A dynamical resolution to the cosmological constant fine-tuning problem has
been previously put forward, based on a scalar-tensor gravitational theory
possessing de Sitter attractor solutions characterized by a small Hubble
expansion rate, irrespective of an initially large vacuum energy. We show that
a technically natural subregion of the parameter space yields a cosmological
evolution through radiation- and matter-dominated eras that is essentially
indistinguishable from that predicted by General Relativity. Similarly, the
proposed model automatically satisfies the observational constraints on a fifth
force mediated by the new scalar degree of freedom.
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