Inflection-point inflation in a hyper-charge oriented U(1)X model

Okada, Nobuchika; Okada, Satomi; Raut, Digesh

doi:10.1103/PhysRevD.95.055030

Title: Inflection-point inflation in a hyper-charge oriented ${U (1)}_{X}$ model

Journal Article · Fri Mar 31 00:00:00 EDT 2017 · Physical Review D

DOI:https://doi.org/10.1103/PhysRevD.95.055030· OSTI ID:1365638

Okada, Nobuchika ^[1]; Okada, Satomi ^[2]; Raut, Digesh ^[1]

Univ. of Alabama, Tuscaloosa, AL (United States). Dept. of Physics and Astronomy
Yamagata Univ. (Japan). Graduate School of Science and Engineering

Inflection-point inflation is an interesting possibility to realize a successful slow-roll inflation when inflation is driven by a single scalar field with its value during inflation below the Planck mass (ΦI≲M_Pl). In order for a renormalization group (RG) improved effective λΦ⁴ potential to develop an inflection-point, the running quartic coupling λ(Φ) must exhibit a minimum with an almost vanishing value in its RG evolution, namely λ(Φ_I)≃0 and β_λ(ΦI)≃0, where β_λ is the beta-function of the quartic coupling. Here in this paper, we consider the inflection-point inflation in the context of the minimal gauged U(1)_X extended Standard Model (SM), which is a generalization of the minimal U(1)_B$$-$$L model, and is constructed as a linear combination of the SM U(1)_Y and U(1)_B$$-$$L gauge symmetries. We identify the U(1)_X Higgs field with the inflaton field. For a successful inflection-point inflation to be consistent with the current cosmological observations, the mass ratios among the U(1)_X gauge boson, the right-handed neutrinos and the U(1)_X Higgs boson are fixed. Focusing on the case that the extra U(1)_X gauge symmetry is mostly aligned along the SM U(1)_Y direction, we investigate a consistency between the inflationary predictions and the latest LHC Run-2 results on the search for a narrow resonance with the di-lepton final state.

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Research Organization:: Univ. of Alabama, Tuscaloosa, AL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP)

Grant/Contract Number:: SC0013680

OSTI ID:: 1365638

Alternate ID(s):: OSTI ID: 1349543

Journal Information:: Physical Review D, Vol. 95, Issue 5; ISSN 2470-0010

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 24 works

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