Realistic inflation in no-scale U(1) R symmetric flipped SU(5)

Abid, Mian Muhammad Azeem; Mehmood, Maria; Rehman, Mansoor Ur; Shafi, Qaisar

doi:10.1088/1475-7516/2021/10/015

Title: Realistic inflation in no-scale U(1)_R symmetric flipped SU(5)

Journal Article · Fri Oct 08 00:00:00 EDT 2021 · Journal of Cosmology and Astroparticle Physics

DOI:https://doi.org/10.1088/1475-7516/2021/10/015· OSTI ID:1979338

Abid, Mian Muhammad Azeem ^[1]; Mehmood, Maria ^[1]; Rehman, Mansoor Ur ^[1]; Shafi, Qaisar ^[2]

Quaid-i-Azam University, Islamabad (Pakistan)
University of Delaware, Newark, DE (United States)

We have realized non-minimal Higgs inflation and standard hybrid inflation in the supersymmetric flipped SU(5) model with U(1)_R symmetry using the no-scale form of the Kähler potential. In non-minimal Higgs inflation the waterfall Higgs field plays the role of inflaton, and in standard hybrid inflation the gauge singlet field S is employed as an inflaton. The predictions of both models are in good agreement with the Planck 2018 data. For numerical calculations we have fixed the gauge symmetry breaking scale, M, around 2 × 10¹⁶ GeV. In both models the inflaton field values are constrained below m_P. The tensor to scalar ratio r in non-minimal inflation is of the order of 10^-3 and for standard hybrid inflation r is tiny, of order 10^-15–10^-4. The scalar spectral index in both cases lie within the Planck 1-σ bounds, and the running of the scalar spectral index lies in the range, -dn_s/d ln k ~ 6 × 10^-4 for non-minimal model and 10^-9–10^-3 for the standard hybrid model. A realistic scenario of reheating and non-thermal leptogenesis is employed with reheat temperature T_r ~ 10⁹ GeV for non-minimal model and 10⁶–10¹⁰ GeV for standard hybrid model. The R-symmetry plays a vital role in forbidding rapid proton decay, but at the same time it also suppresses terms responsible for generating right handed neutrino masses. A realistic scenario of right handed neutrino masses is obtained by considering effective R symmetry breaking at the nonrenormalizable level with adequate suppression of rapid proton decay.

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Research Organization:: Univ. of Delaware, Newark, DE (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: SC0013880

OSTI ID:: 1979338

Alternate ID(s):: OSTI ID: 1998103

Journal Information:: Journal of Cosmology and Astroparticle Physics, Vol. 2021, Issue 10; ISSN 1475-7516

Publisher:: Institute of Physics (IOP)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: Realistic inflation in no-scale U(1) R symmetric flipped SU(5)

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Title: Realistic inflation in no-scale U(1)_R symmetric flipped SU(5)