SMatrix and Anomaly of de Sitter
Abstract
$S$matrix formulation of gravity excludes de Sitter vacua. In particular, this is organic to string theory. The $S$matrix constraint is enforced by an anomalous quantum breaktime proportional to the inverse values of gravitational and/or string couplings. Due to this, de Sitter can satisfy the conditions for a valid vacuum only at the expense of trivializing the graviton and closedstring $S$matrixes. At nonzero gravitational and string couplings, de Sitter is deformed by corpuscular $1/N$ effects, similarly to WittenVeneziano mechanism in QCD with $N$ colors. In this picture, an $S$matrix formulation of Einstein gravity, such as string theory, nullifies an outstanding cosmological puzzle. We discuss possible observational signatures which are especially interesting in theories with large number of particle species. Species can enhance the primordial quantum imprints to potentially observable level even if the standard inflaton fluctuations are negligible.
 Publication:

Symmetry
 Pub Date:
 December 2020
 DOI:
 10.3390/sym13010003
 arXiv:
 arXiv:2012.02133
 Bibcode:
 2020Symm...13....3D
 Keywords:

 High Energy Physics  Theory;
 Astrophysics  Cosmology and Nongalactic Astrophysics;
 General Relativity and Quantum Cosmology;
 High Energy Physics  Phenomenology
 EPrint:
 12 pages