The Most General Four-Derivative Unitary String Effective Action with Torsion and Stringy Running Vacuum Model Inflation: Old Ideas from a Modern Perspective

The string-inspired running vacuum model (StRVM) of inflation is based on a Chern–Simons (CS) gravity effective action in which the only four-spacetime-derivative-order term is a gravitational anomalous CS–Pontryagin density coupled to an axion. In this work, we revisit curvature-squared string-insp...

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Главные авторы:	Nick E. Mavromatos, George Panagopoulos
Формат:	Artigo
Язык:	Inglês
Опубликовано:	MDPI AG 2026-03-01
Серии:	Universe
Предметы:	string effective actions local field redefinitions unitarity torsion Chern–Simons gravity gravitational waves
Online-ссылка:	https://www.mdpi.com/2218-1997/12/3/90
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