Fine tuning may not be enough

Shun-Pei Miao, R. P. Woodard

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

We argue that the fine tuning problems of scalar-driven inflation may be worse than is commonly believed. The reason is that reheating requires the inflaton to be coupled to other matter fields whose vacuum fluctuations alter the inflaton potential. The usual response has been that even more fine-tuning of the classical potential V(φ) can repair any damage done in this way. We point out that the effective potential in de Sitter background actually depends in a complicated way upon the dimensionless combination of φ/H. We also show that the factors of H which occur in de Sitter do not even correspond to local functionals of the metric for general geometries, nor are they Planck-suppressed.

Original languageEnglish
Article number022
JournalJournal of Cosmology and Astroparticle Physics
Volume2015
Issue number9
DOIs
Publication statusPublished - 2015 Sep 8

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tuning
functionals
scalars
damage
vacuum
heating
geometry

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics

Cite this

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Fine tuning may not be enough. / Miao, Shun-Pei; Woodard, R. P.

In: Journal of Cosmology and Astroparticle Physics, Vol. 2015, No. 9, 022, 08.09.2015.

Research output: Contribution to journalArticle

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