Emergent inflation from a Nambu–Jona-Lasinio mechanism in gravity with non-dynamical torsion

Journal Article · 02 April 2019 · European Physical Journal. C, Particles and Fields

DOI: https://doi.org/10.1140/epjc/s10052-019-6803-7 · OSTI ID:1529238

Addazi, Andrea ^[1]; Chen, Pisin ^[2]; Marcianò, Antonino ^[1]

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1. Fudan Univ., Shanghai (China)
2. National Taiwan Univ., Taipei (Taiwan); Stanford Univ., Stanford, CA (United States)

We discuss how inflation can emerge from a four-fermion interaction induced by torsion. Inflation can arise from coupling torsion to Standard Model fermions, without any need of introducing new scalar particles beyond the Standard Model. Within this picture, the inflaton field can be a composite field of the SM-particles and arises from a Nambu–Jona-Lasinio mechanism in curved space-time, non-minimally coupled with the Ricci scalar. The model we specify predicts small value of the r-parameter, namely r ~10^–4 ÷ 10^–2, which nonetheless would be detectable by the next generation of experiments, including BICEP 3 and the AliCPT projects.

• Research Organization: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
• Sponsoring Organization: USDOE
• Grant/Contract Number: AC02-76SF00515; 11875113
• OSTI ID: 1529238
• Journal Information: European Physical Journal. C, Particles and Fields, Vol. 79, Issue 4; ISSN 1434-6044
• Publisher: SpringerCopyright Statement
• Country of Publication: United States
• Language: English