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Title: Sneutrino tribrid inflation, metastable cosmic strings and gravitational waves

Journal Article · · Journal of Cosmology and Astroparticle Physics
 [1];  [1];  [2]
  1. Quaid-i-Azam University, Islamabad (Pakistan)
  2. University of Delaware, Newark, DE (United States)
+ Show Author Affiliations

We present a successful realization of sneutrino tribrid inflation model based on a gauged U(1)_B-L extension of Minimal Supersymmetric Standard Model (MSSM). A single interaction term involving the B-L Higgs field and the right-handed neutrinos serves multiple purposes. These include the generation of heavy Majorana masses for the right-handed neutrinos to provide an explanation for the tiny neutrino masses via the seesaw mechanism, a realistic scenario for reheating and non-thermal leptogenesis with a reheat temperature as low as 106 GeV, and a successful realization of inflation with right-handed sneutrino as the inflaton. The matter parity which helps avoid rapid proton decay survives as a Z2 subgroup of a U(1) R-symmetry. Depending on the choice of model parameters yields the following predicted range of the tensor to scalar ratio, 3 x 10-11≲ r≲ 7x 10-4 (6 x 10-7≲ r ≲ 0.01), and the running of the scalar spectral index, -0.00022 ≲ dn_s/dln k ≲ -0.0026 (-0.00014 ≲ dn_s/dln k ≲ 0.005), along with the B-L breaking scale, 3 x 1014≲ M/ GeV≲ 5 x 1015 (6 x 1015 ≲ M/ GeV≲ 2 x 1016), calculated at the central value of the scalar spectral index, n_s =0.966, reported by Planck 2018. The possibility of realizing metastable cosmic strings in a grand unified theory setup is briefly discussed. The metastable cosmic string network admits string tension values in the range 10-8≲ Gμs ≲ 10-6, and predicts a stochastic gravitational wave background lying within the 2-σ bounds of the recent NANOGrav 12.5-yr data.

Research Organization:
Univ. of Delaware, Newark, DE (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
SC0013880
OSTI ID:
1979342
Alternate ID(s):
OSTI ID: 1998144
Journal Information:
Journal of Cosmology and Astroparticle Physics, Vol. 2021, Issue 11; ISSN 1475-7516
Publisher:
Institute of Physics (IOP)Copyright Statement
Country of Publication:
United States
Language:
English

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Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
gravitational waves / sources
inflation
particle physics
cosmology connection
supersymmetry and cosmology