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The role of temperature dependent string-inspired CPT violating backgrounds in leptogenesis and the chiral magnetic

Thomas Bossingham¹, Nick E Mavromatos¹, Sarben Sarkar¹

¹Theoretical Particle Physics and Cosmology Group, Department of Physics, King's College London, Strand, London, WC2R 2LS UK.

The European Physical Journal. C, Particles and Fields

|March 16, 2019

Abstract:

In a temperature dependent CPT-Violating (CPTV) axial time-like background (induced by the Kalb-Ramond tensor field of string theory) we discuss leptogenesis by solving the Boltzmann equation.The current work non-trivially modifies the framework of a previous phenomenological approach by the authors where the CPTV axial background was considered to be a constant (with no microscopic justification). The constant background approximation though is shown to capture the main phenomenological features of leptogenesis. On comparing our analysis to the related chiral magnetic effect for axial current condensates, we conclude that the Kalb-Ramond field does not play the role of the chiral chemical potential needed for that effect.

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