scholarly journals Subcritical hybrid inflation in a generalized superconformal model

2021 ◽  
Vol 104 (12) ◽  
Author(s):  
Yoshihiro Gunji ◽  
Koji Ishiwata
Keyword(s):  
Hybrid Inflation

scholarly journals Harmonic hybrid inflation

2020 ◽  
Vol 2020 (12) ◽  
Author(s):  
Federico Carta ◽  
Nicole Righi ◽  
Yvette Welling ◽  
Alexander Westphal
Keyword(s):  
Domain Wall ◽  
Symmetry Breaking ◽  
Initial Conditions ◽  
Scalar Potential ◽  
Field Range ◽  
Slow Roll ◽  
Minimal Form ◽  
Wide Range ◽  
Hybrid Inflation ◽  
Type Iib String Theory

Abstract We present a mechanism for realizing hybrid inflation using two axion fields with a purely non-perturbatively generated scalar potential. The structure of the scalar potential is highly constrained by the discrete shift symmetries of the axions. We show that harmonic hybrid inflation generates observationally viable slow-roll inflation for a wide range of initial conditions. This is possible while accommodating certain UV arguments favoring constraints f ≲ MP and ∆ϕ60 ≲ MP on the axion periodicity and slow-roll field range, respectively. We discuss controlled ℤ2-symmetry breaking of the adjacent axion vacua as a means of avoiding cosmological domain wall problems. Including a minimal form of ℤ2-symmetry breaking into the minimally tuned setup leads to a prediction of primordial tensor modes with the tensor-to-scalar ratio in the range 10−4 ≲ r ≲ 0.01, directly accessible to upcoming CMB observations. Finally, we outline several avenues towards realizing harmonic hybrid inflation in type IIB string theory.

scholarly journals Observable proton decay in flipped SU(5)

2021 ◽  
Vol 2021 (2) ◽  
Author(s):  
Maria Mehmood ◽  
Mansoor Ur Rehman ◽  
Qaisar Shafi
Keyword(s):  
Neutrino Mass ◽  
Gauge Coupling ◽  
Proton Decay ◽  
Type I ◽  
Mass Model ◽  
Intermediate Scale ◽  
Decay Channels ◽  
Proton Lifetime ◽  
Hybrid Inflation ◽  
Neutrino Mass Models

Abstract We explore proton decay in a class of realistic supersymmetric flipped SU(5) models supplemented by a U(1)R symmetry which plays an essential role in implementing hybrid inflation. Two distinct neutrino mass models, based on inverse seesaw and type I seesaw, are identified, with the latter arising from the breaking of U(1)R by nonrenormalizable superpotential terms. Depending on the neutrino mass model an appropriate set of intermediate scale color triplets from the Higgs superfields play a key role in proton decay channels that include p → (e+, μ+) π0, p → (e+, μ+) K0, p →$$ \overline{v}{\pi}^{+} $$ v ¯ π + , and p →$$ \overline{v}{K}^{+} $$ v ¯ K + . We identify regions of the parameter space that yield proton lifetime estimates which are testable at Hyper-Kamiokande and other next generation experiments. We discuss how gauge coupling unification in the presence of intermediate scale particles is realized, and a Z4 symmetry is utilized to show how such intermediate scales can arise in flipped SU(5). Finally, we compare our predictions for proton decay with previous work based on SU(5) and flipped SU(5).

scholarly journals Initial conditions for smooth hybrid inflation

1996 ◽  
Vol 54 (2) ◽  
pp. 1369-1373 ◽  
Author(s):  
G. Lazarides ◽  
C. Panagiotakopoulos ◽  
N. D. Vlachos
Keyword(s):  
Initial Conditions ◽  
Hybrid Inflation

scholarly journals Waterfall field in hybrid inflation and curvature perturbation

2011 ◽  
Vol 2011 (03) ◽  
pp. 028-028 ◽  
Author(s):  
Jinn-Ouk Gong ◽  
Misao Sasaki
Keyword(s):  
Curvature Perturbation ◽  
Hybrid Inflation

scholarly journals Red spectral tilt and observable gravity waves in shifted hybrid inflation

2011 ◽  
Vol 84 (10) ◽  
Author(s):  
Matthew Civiletti ◽  
Mansoor Ur Rehman ◽  
Qaisar Shafi ◽  
Joshua R. Wickman
Keyword(s):  
Gravity Waves ◽  
Hybrid Inflation ◽  
Spectral Tilt

scholarly journals Beginning of Universe through large field hybrid inflation

2015 ◽  
Vol 30 (21) ◽  
pp. 1550106 ◽  
Author(s):  
Tatsuo Kobayashi ◽  
Osamu Seto
Keyword(s):  
Gravitational Wave ◽  
Early Universe ◽  
High Energy ◽  
Wave Mode ◽  
Energy Scale ◽  
Large Field ◽  
Tensor Perturbation ◽  
Expectation Value ◽  
Hybrid Inflation ◽  
High Energy Scale

Recent detection of B-mode polarization induced from tensor perturbations by the BICEP2 experiment implies the so-called large field inflation, where an inflaton field takes super-Planckian expectation value during inflation, at a high energy scale. We show however, if another inflation follows hybrid inflation, the hybrid inflation can generate a large tensor perturbation with not super-Planckian but Planckian field value. This scenario would relax the tension between BICEP2 and Planck concerning the tensor-to-scalar ratio, because a negative large running can also be obtained for a certain number of e-fold of the hybrid inflation. A natural interpretation of a large gravitational wave mode with or without the scalar spectral running might be multiple inflation in the early Universe.

scholarly journals Reheat temperature in supersymmetric hybrid inflation models

2005 ◽  
Vol 71 (4) ◽  
Author(s):  
V. N. Şenoğuz ◽  
Q. Shafi
Keyword(s):  
Hybrid Inflation

scholarly journals Reconstruction of potentials of hybrid inflation in the light of primordial black hole formation

2021 ◽  
Vol 2021 (06) ◽  
pp. 054
Author(s):  
Ki-Young Choi ◽  
Su-beom Kang ◽  
Rathul Nath Raveendran
Keyword(s):  
Black Hole ◽  
Primordial Black Hole ◽  
Hole Formation ◽  
Black Hole Formation ◽  
Hybrid Inflation

scholarly journals Hybrid inflation, dark energy and dark matter

2005 ◽  
Vol 620 (3-4) ◽  
pp. 105-110 ◽  
Author(s):  
Qaisar Shafi ◽  
Arunansu Sil ◽  
Siew-Phang Ng
Keyword(s):  
Dark Matter ◽  
Dark Energy ◽  
Hybrid Inflation
Sign in / Sign up

Export Citation Format

Share Document