Axions in gravity with torsion

Abstract

We study a scenario allowing a solution of the strong charge parity problem via the Peccei-Quinn mechanism, implemented in gravity with torsion. In this framework there appears a torsion-related pseudoscalar field known as Kalb-Ramond axion. We compare it with the so-called Barbero-Immirzi axion recently proposed in the literature also in the context of the gravity with torsion. We show that they are equivalent from the viewpoint of the effective theory. The phenomenology of these torsion-descended axions is completely determined by the Planck scale without any additional model parameters. These axions are very light and very weakly interacting with ordinary matter. We briefly comment on their astrophysical and cosmological implications in view of the recent BICEP2 and Planck data.

7 pages, no figures, comments and references added, published version

References in corpus (5)

• A Joint Analysis of BICEP2/Keck Array and Planck Data
• BICEP3: a 95 GHz refracting telescope for degree-scale CMB polarization
• Peccei--Quinn mechanism in gravity and the nature of the Barbero--Immirzi parameter
• Torsion in Extra Dimensions and One-Loop Observables
• Does the BICEP2 Observation of Cosmological Tensor Modes Imply an Era of Nearly Planckian Energy Densities?

Cited by in corpus (7)

• Non-zero torsion and late cosmology
• Luminal Propagation of Gravitational Waves in Scalar-tensor Theories: The Case for Torsion
• Updated limits on the CP violating $\eta \pi \pi$ and ${\eta }^{\prime }\pi \pi$ couplings derived from the neutron EDM
• Solar neutrinos, helicity effects and new affine gravity with torsion II
• Beyond Einstein: A Polynomial Affine Model of Gravity
• Duality and higher Buscher rules in p-form gauge theory and linearized gravity
• Parity violation in Poincaré gauge gravity