Implication of Preheating on Gravity Assisted Baryogenesis in R 2-Higgs Inflation

Yann Cado,Christoph Englert,Tanmoy Modak,Mariano Quiros

PHYSICAL REVIEW D（2025）

Sorbonne Univ | Univ Glasgow | Indian Inst Sci Educ & Res Berhampur | Inst Fis Altes Energies IFAE

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Abstract

We investigate the impact of preheating on baryogenesis in R2-Higgs inflation. In this scenario, the inclusion of a dimension-six operator (R/A2)B mu nu B mu nu abundantly generates helical hypermagnetic fields during inflation, leading to a baryon asymmetric Universe at the electroweak crossover. Focusing on the R2-like regime, we first derive the relevant dynamics of preheating using a doubly covariant formalism. We find that preheating can happen for the Higgs, transverse gauge, and Goldstone bosons, however, it is dependent on the value of the nonminimal coupling xi H between the Standard Model Higgs field and the Ricci scalar. We identify the preheating temperature to determine the appropriate scale A for driving baryogenesis, which is around A 2.2(2.6) x 10-5MP for xi H 1(10). Our results represent the most accurate estimation of the scale of gravity induced baryogenesis in R2-Higgs inflation to date. Areas for further improvement are identified.

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