scholarly journals Shifted μ -hybrid inflation, gravitino dark matter, and observable gravity waves

2021 ◽  
Vol 103 (3) ◽  
Author(s):  
George Lazarides ◽  
Mansoor Ur Rehman ◽  
Qaisar Shafi ◽  
Fariha K. Vardag
Keyword(s):  
Dark Matter ◽  
Gravity Waves ◽  
Hybrid Inflation

scholarly journals Gravity waves and gravitino dark matter in μ-hybrid inflation

2018 ◽  
Vol 787 ◽  
pp. 141-145
Author(s):  
Nobuchika Okada ◽  
Qaisar Shafi
Keyword(s):  
Dark Matter ◽  
Gravity Waves ◽  
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 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

scholarly journals Dark matter gravity waves at LIGO and LISA

2019 ◽  
Vol 34 (16) ◽  
pp. 1950124
Author(s):  
Paul H. Frampton
Keyword(s):  
Black Holes ◽  
Dark Matter ◽  
Gravitational Wave ◽  
Gravity Waves ◽  
Gravitational Radiation ◽  
Massive Stars ◽  
Strain Sensitivity ◽  
Intermediate Mass ◽  
To Come ◽  
Merger Rate

We study the merger rate of dark matter PIMBHs (Primordial Intermediate Mass Black Holes). We conclude that the black holes observed by LIGO in GW150914 and later events were probably not dark matter PIMBHs but rather the result of gravitational collapse of very massive stars. To study the PIMBHs by gravitational radiation will require a detector sensitive to frequencies below 10 Hz and otherwise more sensitive than LIGO. The LISA detector, expected to come online in 2034, will be useful at frequencies below 1 Hz but further gravitational wave detectors beyond LISA, sensitive up to 10 Hz, and higher strain sensitivity will be necessary to fully study dark matter.

scholarly journals μ -hybrid inflation with low reheat temperature and observable gravity waves

2017 ◽  
Vol 96 (6) ◽  
Author(s):  
Mansoor Ur Rehman ◽  
Qaisar Shafi ◽  
Fariha K. Vardag
Keyword(s):  
Gravity Waves ◽  
Hybrid Inflation

scholarly journals Relic gravity waves and 7 keV dark matter from a GeV scale inflaton

2014 ◽  
Vol 736 ◽  
pp. 494-498 ◽  
Author(s):  
F.L. Bezrukov ◽  
D.S. Gorbunov
Keyword(s):  
Dark Matter ◽  
Gravity Waves

scholarly journals WIMP dark matter inflation with observable gravity waves

2011 ◽  
Vol 84 (4) ◽  
Author(s):  
Nobuchika Okada ◽  
Qaisar Shafi
Keyword(s):  
Dark Matter ◽  
Gravity Waves

scholarly journals HYBRID INFLATION FOLLOWED BY MODULAR INFLATION

2007 ◽  
Vol 22 (31) ◽  
pp. 5747-5759 ◽  
Author(s):  
GEORGE LAZARIDES
Keyword(s):  
Dark Matter ◽  
Cosmological Model ◽  
Cold Dark Matter ◽  
Grand Unification ◽  
Coupling Constant ◽  
Curvature Perturbation ◽  
Intermediate Scale ◽  
Central Values ◽  
Hybrid Inflation ◽  
Inflationary Models

Inflationary models with a superheavy scale F-term hybrid inflation followed by an intermediate scale modular inflation are considered. The restrictions on the power spectrum [Formula: see text] of curvature perturbation and the spectral index ns from the recent data within the power-law cosmological model with cold dark matter and a cosmological constant can be met provided that the number of e-foldings N HI * suffered by the pivot scale k* = 0.002/ Mpc during hybrid inflation is suitably restricted. The additional e-foldings needed for solving the horizon and flatness problems are generated by modular inflation with a string axion as inflaton. For central values of [Formula: see text] and ns, the grand unification scale comes out, in the case of standard hybrid inflation, close to its supersymmetric value M GUT ≃ 2.86 × 1016 GeV , the relevant coupling constant is relatively large (≈ 0.005 – 0.14), and 10 ≲ N HI * ≲ 21.7. In the shifted [smooth] hybrid inflation case, the grand unification scale can be identified with M GUT for N HI * ≃ 21 [N HI * ≃ 18].

scholarly journals Observable gravity waves from supersymmetric hybrid inflation

2011 ◽  
Vol 696 (5) ◽  
pp. 438-446 ◽  
Author(s):  
Qaisar Shafi ◽  
Joshua R. Wickman
Keyword(s):  
Gravity Waves ◽  
Hybrid Inflation

scholarly journals Gravity waves and proton decay in a flipped SU(5) hybrid inflation model

2018 ◽  
Vol 97 (12) ◽  
Author(s):  
Mansoor Ur Rehman ◽  
Qaisar Shafi ◽  
Umer Zubair
Keyword(s):  
Gravity Waves ◽  
Proton Decay ◽  
Inflation Model ◽  
Hybrid Inflation
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