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

Thomas Bossingham; Nick E. Mavromatos; Sarben Sarkar

doi:10.1140/epjc/s10052-019-6564-3

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

Thomas Bossingham, Nick E. Mavromatos^*, Sarben Sarkar

^*Corresponding author for this work

Department of Clinical Physics

Research output: Contribution to journal › Article › peer-review

26 Citations (Scopus)

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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.

Original language	English
Article number	50
Pages (from-to)	1-15
Journal	European Physical Journal C
Volume	79
Issue number	1
Early online date	21 Jan 2019
DOIs	https://doi.org/10.1140/epjc/s10052-019-6564-3
Publication status	Published - Jan 2019

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10.1140/epjc/s10052-019-6564-3Licence: CC BY

The role of temperature_BOSSINGHAM_Accepted3January2019 GOLD VoR (CC BY)Final published version, 631 KBLicence: CC BY

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

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