Quantum Anomalies in String-Inspired Running Vacuum Universe: Inflation and Axion Dark Matter

26 Feb 2020 Basilakos Spyros Mavromatos Nick E. Sola Joan

In this letter, we elaborate further on a Cosmological "Running-Vacuum" type model for the Universe, suggested previously by the authors within the context of a string-inspired effective theory in the presence of a Kalb-Ramond (KR) gravitational axion field which descends from the antisymmetric tensor of the massless gravitational string multiplet. In the presence of this field, which has anomalous CP violating interactions with the gravitons, primordial gravitational waves induce gravitational anomalies, which in turn are responsible for the appearance of $H^2$ and $H^4$ contributions to the vacuum energy density, these terms being characteristic of generic "running-vacuum-model (RVM) type", where $H$ is the Hubble parameter... (read more)

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Categories


  • GENERAL RELATIVITY AND QUANTUM COSMOLOGY
  • HIGH ENERGY PHYSICS - PHENOMENOLOGY
  • HIGH ENERGY PHYSICS - THEORY