Zobrazeno 1 - 10
of 35
pro vyhledávání: '"Moursy, Ahmad"'
We explore the cosmological and astrophysical implications of a realistic hybrid inflation model based on flipped $SU(5)$. The model contains superheavy metastable cosmic strings arising from a waterfall field that encounters a limited number of $e$-
Externí odkaz:
http://arxiv.org/abs/2409.13584
Autor:
Moursy, Ahmad, Shafi, Qaisar
We show how topologically stable superheavy magnetic monopoles and primordial black holes can be generated at observable levels by the waterfall field in hybrid inflation models based on grand unified theories. In $SU(5) \times U(1)_\chi$ grand unifi
Externí odkaz:
http://arxiv.org/abs/2405.04397
Inflation, superheavy metastable strings and gravitational waves in non-supersymmetric flipped SU(5)
Publikováno v:
JCAP 03 (2024) 006
Motivated by the NANOGrav 15 year data and other recent investigations of stochastic gravitational background radiation based on pulsar timing arrays, we show how superheavy strings survive inflation but the slightly heavier monopoles do not in a non
Externí odkaz:
http://arxiv.org/abs/2308.07094
We propose a model realizes that a semi-visible dark photon which can contribute to the anomalous magnetic moment ($g-2$) of both electron and muon. In this model, the electron $g-2$ is deviated from the Standard Model (SM) prediction by the 1-loop d
Externí odkaz:
http://arxiv.org/abs/2308.05691
Cosmological probes of Grand Unification: Primordial Blackholes & scalar-induced Gravitational Waves
We investigate the inflationary cosmology involving an SU(5) GUT (grand unified theory) singlet scalar with non-minimal coupling to the Ricci scalar. In this scenario the scale of grand unification is set by the inflaton vev when the inflaton rolls d
Externí odkaz:
http://arxiv.org/abs/2306.04002
Publikováno v:
Phys. Rev. D 107, 035023 (2023)
We propose a modification to the standard hybrid inflation model \cite{Linde:1993cn}, that connects a successful hybrid inflation scenario to the standard model Higgs sector, via the electroweak vacuum stability. The proposed model results in an effe
Externí odkaz:
http://arxiv.org/abs/2210.03247
In supergravity, the dynamics of the sgoldstino -- superpartner of the goldstino superfield associated with the breaking of supersymmetry at low energy -- can substantially modify the dynamics of inflation in the primordial Universe. So-called sgolds
Externí odkaz:
http://arxiv.org/abs/2207.11502
Autor:
Moursy, Ahmad
We develop a model of sneutrino inflation that is charged under $U(1)_{B-L}$ gauge symmetry in no-scale supergravity framework. The model provides an interesting modification of tribrid inflation. We impose $U(1)_R$ symmetry on the renormalizable lev
Externí odkaz:
http://arxiv.org/abs/2107.06670
Autor:
Moursy, Ahmad
In this paper we provide a no-scale supergravity scenario of hybrid inflation with R-symmetry being broken maximally. We investigate the inflation dynamics in details in both cases of pure F-term hybrid inflation and when adding constant Fayet-Iliopo
Externí odkaz:
http://arxiv.org/abs/2009.14149
Publikováno v:
Phys. Rev. D 99, 095022 (2019)
We consider a cosmological inflation scenario based on a no-scale supergravity sector with $U(1)_R$ symmetry. It is shown that a tree level $U(1)_R$ symmetric superpotential alone does not lead to a slowly rolling scalar potential. A deformation of t
Externí odkaz:
http://arxiv.org/abs/1810.06408