UV corrections in sgoldstino-less inflation

DOI10.1016/J.PHYSLETB.2016.05.072zbMATH Open1367.83094arXiv1601.03397OpenAlexW2238954422WikidataQ132689062 ScholiaQ132689062MaRDI QIDQ2012385

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Publication date: 31 July 2017

Published in: (Search for Journal in Brave)

Abstract: We study the embedding of inflation with nilpotent multiplets in supergravity, in particular the decoupling of the sgoldstino scalar field. Instead of being imposed by hand, the nilpotency constraint on the goldstino multiplet arises in the low energy-effective theory by integrating out heavy degrees of freedom. We present explicit supergravity models in which a large but finite sgoldstino mass arises from Yukawa or gauge interactions. In both cases the inflaton potential receives two types of corrections. One is from the backreaction of the sgoldstino, the other from the heavy fields generating its mass. We show that these scale oppositely with the Volkov-Akulov cut-off scale, which makes a consistent decoupling of the sgoldstino nontrivial. Still, we identify a parameter window in which sgoldstino-less inflation can take place, up to corrections which flatten the inflaton potential.

Full work available at URL: https://arxiv.org/abs/1601.03397

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