期刊
PHYSICS LETTERS B
卷 750, 期 -, 页码 194-200出版社
ELSEVIER
DOI: 10.1016/j.physletb.2015.09.020
关键词
Higgs boson; Inflation; Standard Model
资金
- STFC [ST/J000418/1]
- Spanish Ministry of Economy and Competitiveness [FPA2012-32828]
- Consolider-CPAN [CSD2007-00042]
- Centro de Excelencia Severo Ochoa Programme [SEV-2012-0249]
- C.A. de Madrid [HEPHACOS-S2009/ESP1473]
- Science and Technology Facilities Council [ST/L000520/1, ST/G00045X/1, ST/J000418/1] Funding Source: researchfish
- STFC [ST/J000418/1, ST/G00045X/1, ST/L000520/1] Funding Source: UKRI
We investigate whether Higgs inflation can occur in the Standard Model starting from natural initial conditions or not. The Higgs has a non-minimal coupling to the Ricci scalar. We confine our attention to the regime where quantum Einstein gravity effects are small in order to have results that are independent of the ultraviolet completion of gravity. At the classical level we find no tuning is required to have successful Higgs inflation, provided the initial homogeneity condition is satisfied. On the other hand, at the quantum level we obtain that the renormalization for large non-minimal coupling requires an additional degree of freedom, unless a tuning of the initial values of the running parameters is made. In order to see that this effect may change the predictions we finally include such degree of freedom in the field content and show that Starobinsky's R-2 inflation dominates over Higgs inflation. (C) 2015 The Authors. Published by Elsevier B.V.
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