TeV scale leptogenesis in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si1.gif" overflow="scroll"><mml:mi>B</mml:mi><mml:mo>−</mml:mo><mml:mi>L</mml:mi></mml:math>model with alternative cosmologies

Abdallah, Waleed; Delépine, D.; Khalil, S.

doi:10.1016/j.physletb.2013.07.047

Cited by 21 publications

(12 citation statements)

References 77 publications

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“…Some recent implications of non-standard cosmology in the context of leptogenesis through RHN decay can be found in refs. [41][42][43]. In the present framework we explicate the influence of such alternate cosmology in order to produce the observed BAU through the process of leptogenesis from the decay of a heavy SM singlet scalar.…”

Section: Jhep03(2021)044mentioning

confidence: 99%

A dark clue to seesaw and leptogenesis in a pseudo-Dirac singlet doublet scenario with (non)standard cosmology

Konar

Mukherjee

Saha

et al. 2021

J. High Energ. Phys.

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We propose an appealing alternative scenario of leptogenesis assisted by dark sector which leads to the baryon asymmetry of the Universe satisfying all theoretical and experimental constraints. The dark sector carries a non minimal set up of singlet doublet fermionic dark matter extended with copies of a real singlet scalar field. A small Majorana mass term for the singlet dark fermion, in addition to the typical Dirac term, provides the more favourable dark matter of pseudo-Dirac type, capable of escaping the direct search. Such a construction also offers a formidable scope to radiative generation of active neutrino masses. In the presence of a (non)standard thermal history of the Universe, we perform the detailed dark matter phenomenology adopting the suitable benchmark scenarios, consistent with direct detection and neutrino oscillations data. Besides, we have demonstrated that the singlet scalars can go through CP-violating out of equilibrium decay, producing an ample amount of lepton asymmetry. Such an asymmetry then gets converted into the observed baryon asymmetry of the Universe through the non-perturbative sphaleron processes owing to the presence of the alternative cosmological background considered here. Unconventional thermal history of the Universe can thus aspire to lend a critical role both in the context of dark matter as well as in realizing baryogenesis.

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Section: Jhep03(2021)044mentioning

confidence: 99%

A dark clue to seesaw and leptogenesis in a pseudo-Dirac singlet doublet scenario with (non)standard cosmology

Konar

Mukherjee

Saha

et al. 2021

J. High Energ. Phys.

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“…On the other hand, The modified expansion law of RSII, modifies common phenomena in cosmology, e.g. gravitino production, 14,15 baryogenesis, [15][16][17] dark matter relic abundance [18][19][20][21][22][23] and etc.…”

Section: Introductionmentioning

confidence: 99%

Hubble inflation in Randall–Sundrum type II model

Abedi

Abbassi

Bahamonde

2020

Int. J. Mod. Phys. D

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We study a braneworld Randall–Sundrum type II (RSII) model using the Hamilton–Jacobi formalism. We extend the standard inflationary parameters and the flow equations for this braneworld scenario. We investigate the conditions that reduce the infinite number of flow equations into a finite number and confirm that by considering one of the inflationary parameters that vanishes, the Hubble expansion rate gets a polynomial form in both General Relativity (GR) and in the high-energy regime of RSII. We also show that if one sets this inflationary parameter to a constant value, the model features a nonpolynomial form of the Hubble expansion rate. The form of the Hubble parameter in this case is different in GR and RSII. Next, we consider a single-scalar field model with a Hubble expansion rate behaving as [Formula: see text] and show that compared to GR, the RSII model has a smaller tensor-to-scalar ratio and larger spectral index for [Formula: see text]. Therefore, RSII model leads to better predictions than GR.

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“…Recent astronomical observations and laboratory experiments appear to show hints that several phenomena in physics, astrophysics and cosmology oppose a traditional view of standard-model physics (e.g., Riess et al 1998;Furniss et al 2013). This has motivated developments of modified or alternative theories of quantum physics and gravitation (e.g., Capozziello et al 2013;Wanas & Hassan 2014;Nashed & El Hanafy 2014;Arbab 2015;Sami et al 2018), generally termed physics beyond the standard model (e.g., Sushkov 2011;Abdallah et al 2013;El-Zant 2015).…”

Section: Introductionmentioning

confidence: 99%

Extragalactic background light inhomogeneities and Lorentz-Invariance Violation in gamma-gamma absorption and Compton scattering

Abdalla

2019

Proc. IAU

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At energies approaching the Planck energy scale 1019GeV, several quantum-gravity theories predict that familiar concepts such as Lorentz (LIV) symmetry can be broken. Such extreme energies are currently unreachable by experiments on Earth, but for photons traveling over cosmological distances the accumulated deviations from the Lorentz symmetry may be measurable using the Cherenkov Telescope Array (CTA). To study the spectral hardening feature observed in some VHE gamma-ray blazars, we calculate the reduction of the EBL gamma-gamma opacity due to the existence of underdense regions along the line of sight to VHE -gamma ray sources and we compared with the possibility of a LIV signature. Considering the LIV effect, we found that the cosmic opacity for VHE-gamma rays with energy more than 10 TeV can be strongly reduced. I will further discuss the impact of LIV on the Compton scattering process, and how future CTA observations may open an exciting window on studies of the fundamental physics.

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TeV scale leptogenesis inB−Lmodel with alternative cosmologies

Cited by 21 publications

References 77 publications

A dark clue to seesaw and leptogenesis in a pseudo-Dirac singlet doublet scenario with (non)standard cosmology

A dark clue to seesaw and leptogenesis in a pseudo-Dirac singlet doublet scenario with (non)standard cosmology

Hubble inflation in Randall–Sundrum type II model

Extragalactic background light inhomogeneities and Lorentz-Invariance Violation in gamma-gamma absorption and Compton scattering

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