Moinul Hossain Rahat
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View article: CP-violating portal to Dark Sectors
CP-violating portal to Dark Sectors Open
View article: Electric Dipole Moments as indirect probes of dark sectors
Electric Dipole Moments as indirect probes of dark sectors Open
A bstract Dark sectors provide beyond Standard Model scenarios which can address unresolved puzzles, such as the observed dark matter abundance or the baryon asymmetry of the Universe. A naturally small portal to the dark sector is obtaine…
View article: Split Majoron model confronts the NANOGrav signal and cosmological tensions
Split Majoron model confronts the NANOGrav signal and cosmological tensions Open
In the light of the evidence of a gravitational wave background from the NANOGrav 15 yr dataset, we reconsider the split Majoron model as a new physics extension of the standard model able to generate a needed contribution to solve the cur…
View article: Type-I two-Higgs-doublet model and gravitational waves from domain walls bounded by strings
Type-I two-Higgs-doublet model and gravitational waves from domain walls bounded by strings Open
A bstract The spontaneous breaking of a U(1) symmetry via an intermediate discrete symmetry may yield a hybrid topological defect of domain walls bounded by cosmic strings . The decay of this defect network leads to a unique gravitational …
View article: Electric Dipole Moments as indirect probes of Dark Sectors
Electric Dipole Moments as indirect probes of Dark Sectors Open
Dark sectors provide beyond Standard Model scenarios which can address unresolved puzzles, such as the observed dark matter abundance or the baryon asymmetry of the Universe. A naturally small portal to the dark sector is obtained if dark-…
View article: Flavon vacuum alignment beyond SUSY
Flavon vacuum alignment beyond SUSY Open
In flavor models the vacuum alignment of flavons is typically achieved via the F-terms of certain fields in the supersymmetric limit. We propose a method for preserving such alignments, up to a rescaling of the vacuum expectation values, e…
View article: Gravitational waves from phase transitions and cosmic strings in neutrino mass models with multiple majorons
Gravitational waves from phase transitions and cosmic strings in neutrino mass models with multiple majorons Open
A bstract We explore the origin of Majorana masses within the majoron model and how this can lead to the generation of a distinguishable primordial stochastic background of gravitational waves. We first show how in the simplest majoron mod…
View article: Type-I two-Higgs-doublet model and gravitational waves from domain walls bounded by strings
Type-I two-Higgs-doublet model and gravitational waves from domain walls bounded by strings Open
The spontaneous breaking of a $U(1)$ symmetry via an intermediate discrete symmetry may yield a hybrid topological defect of \emph{domain walls bounded by cosmic strings}. The decay of this defect network leads to a unique gravitational wa…
View article: Toward distinguishing Dirac from Majorana neutrino mass with gravitational waves
Toward distinguishing Dirac from Majorana neutrino mass with gravitational waves Open
We propose a new method toward distinguishing the Dirac versus Majorana nature of neutrino masses from the spectrum of gravitational waves (GWs) associated with neutrino mass genesis. Motivated by the principle of generating small neutrino…
View article: NANOGrav signal from axion inflation
NANOGrav signal from axion inflation Open
Several pulsar timing arrays including NANOGrav, EPTA, PPTA, and CPTA have recently reported the observation of a stochastic background of gravitational wave spectrum in the nanohertz frequencies. An inflationary interpretation of this obs…
View article: Flavon vacuum alignment beyond SUSY
Flavon vacuum alignment beyond SUSY Open
In flavor models the vacuum alignment of flavons is typically achieved via the $F$-terms of certain fields in the supersymmetric limit. We propose a method for preserving such alignments, up to a rescaling of the vacuum expectation values,…
View article: Primordial non-Gaussianity as a probe of seesaw and leptogenesis
Primordial non-Gaussianity as a probe of seesaw and leptogenesis Open
A bstract We present the possibility that the seesaw mechanism and nonthermal leptogenesis can be investigated via primordial non-Gaussianities in the context of a majoron curvaton model. Originating as a massless Nambu-Goldstone boson fro…
View article: Primordial non-Gaussianity as a probe of seesaw and leptogenesis
Primordial non-Gaussianity as a probe of seesaw and leptogenesis Open
We present the possibility that the seesaw mechanism and nonthermal leptogenesis can be {investigated} via primordial non-Gaussianities in the context of a majoron curvaton model. Originating as a massless Nambu-Goldstone boson from the sp…
View article: The split majoron model confronts the NANOGrav signal and cosmological tensions
The split majoron model confronts the NANOGrav signal and cosmological tensions Open
In the light of the evidence of a gravitational wave background from the NANOGrav 15yr data set, we reconsider the split majoron model as a new physics extension of the standard model able to generate a needed contribution to solve the cur…
View article: NANOGrav signal from axion inflation
NANOGrav signal from axion inflation Open
Several pulsar timing arrays including NANOGrav, EPTA, PPTA, and CPTA have recently reported the observation of a stochastic background of gravitational wave spectrum in the nano-Hz frequencies. An inflationary interpretation of this obser…
View article: Towards distinguishing Dirac from Majorana neutrino mass with gravitational waves
Towards distinguishing Dirac from Majorana neutrino mass with gravitational waves Open
We propose a new method towards distinguishing the Dirac versus Majorana nature of neutrino masses from the spectrum of gravitational waves (GWs) associated with neutrino mass genesis. Motivated by the principle of generating small neutrin…
View article: Gravitational waves from phase transitions and cosmic strings in neutrino mass models with multiple majorons
Gravitational waves from phase transitions and cosmic strings in neutrino mass models with multiple majorons Open
We explore the origin of Majorana masses within the majoron model and how this can lead to the generation of a distinguishable primordial stochastic background of gravitational waves. We first show how in the simplest majoron model only a …
View article: Parity-odd and even trispectrum from axion inflation
Parity-odd and even trispectrum from axion inflation Open
The four-point correlation function of primordial scalar perturbations has parity-even and parity-odd contributions and the parity-odd signal in cosmological observations is opening a novel window to look for new physics in the inflationar…
View article: Gravitational wave probes of massive gauge bosons at the cosmological collider
Gravitational wave probes of massive gauge bosons at the cosmological collider Open
We extend the reach of the “cosmological collider” for massive gauge boson production during inflation from the CMB scales to the interferometer scales. Considering a Chern-Simons coupling between the gauge bosons and the pseudoscalar infl…
View article: Gravitational Wave Probes of Massive Gauge Bosons at the Cosmological Collider
Gravitational Wave Probes of Massive Gauge Bosons at the Cosmological Collider Open
We extend the reach of the ``cosmological collider'' for massive gauge boson production during inflation from the CMB scales to the interferometer scales. Considering a Chern-Simons coupling between the gauge bosons and the pseudoscalar in…
View article: Parity-Odd and Even Trispectrum from Axion Inflation
Parity-Odd and Even Trispectrum from Axion Inflation Open
The four-point correlation function of primordial scalar perturbations has parity-even and parity-odd contributions and the parity-odd signal in cosmological observations is opening a novel window to look for new physics in the inflationar…
View article: BBN photodisintegration constraints on gravitationally produced vector bosons
BBN photodisintegration constraints on gravitationally produced vector bosons Open
View article: Constraining low-scale flavor models with <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mo stretchy="false">(</mml:mo><mml:mi>g</mml:mi><mml:mo>−</mml:mo><mml:mn>2</mml:mn><mml:msub><mml:mo stretchy="false">)</mml:mo><mml:mi>μ</mml:mi></mml:msub></mml:math> and lepton flavor violation
Constraining low-scale flavor models with and lepton flavor violation Open
We present here two concrete examples of models where a sub-TeV scale breaking of their respective T13 and A5 flavor symmetries is able to account for the recently observed discrepancy in the muon anomalous magnetic moment, (g-2)μ. Similar…
View article: Low-scale resonant leptogenesis in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>S</mml:mi><mml:mi>U</mml:mi><mml:mo stretchy="false">(</mml:mo><mml:mn>5</mml:mn><mml:mo stretchy="false">)</mml:mo></mml:math> GUT with <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi mathvariant="script">T</mml:mi><mml:mn>13</mml:mn></mml:msub></mml:math> family symmetry
Low-scale resonant leptogenesis in GUT with family symmetry Open
We investigate low-scale resonant leptogenesis in an SU(5) x $\\mathscr{T}_{13}$ model where a single high-energy phase in the complex tribimaximal seesaw mixing produces the yet to be observed low-energy Dirac and Majorana CP phases. A fo…
View article: Low-scale Resonant Leptogenesis in $SU(5)$ GUT with $\mathcal{T}_{13}$ Family Symmetry
Low-scale Resonant Leptogenesis in $SU(5)$ GUT with $\mathcal{T}_{13}$ Family Symmetry Open
We investigate low-scale resonant leptogenesis in an $SU(5) \times \mathcal{T}_{13}$ model where a single high energy phase in the complex Tribimaximal seesaw mixing produces the yet-to-be-observed low energy Dirac and Majorana ${CP}$ phas…
View article: Leptogenesis from the asymmetric texture
Leptogenesis from the asymmetric texture Open
We investigate nonresonant thermal leptogenesis in the context of the SU(5) × T13 “asymmetric texture”, where both Dirac and Majorana CP violation arise from a single phase in the tribimaximal seesaw mixing matrix. We show that …
View article: Tribimaximal mixing in the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>S</mml:mi><mml:mi>U</mml:mi><mml:mo stretchy="false" mathvariant="bold">(</mml:mo><mml:mn>5</mml:mn><mml:mo stretchy="false" mathvariant="bold">)</mml:mo><mml:mo>×</mml:mo><mml:msub><mml:mi mathvariant="script">T</mml:mi><mml:mn>13</mml:mn></mml:msub></mml:math> texture
Tribimaximal mixing in the texture Open
We extend the recently proposed $SU(5) \\times \\mathcal{T}_{13}$ model for the asymmetric texture to the up-type quark and Seesaw sectors. The hierarchical up-type quark masses are generated from higher-dimensional operators involving fam…
View article: Stitching an asymmetric texture with <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="script">T</mml:mi></mml:mrow><mml:mrow><mml:mn>13</mml:mn></mml:mrow></mml:msub><mml:mo>×</mml:mo><mml:msub><mml:mrow><mml:mi mathvariant="script">Z</mml:mi></mml:mrow><mml:mrow><mml:mn>5</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math> family symmetry
Stitching an asymmetric texture with family symmetry Open
We propose T13 = Z13 x Z3 as the underlying non-Abelian discrete family symmetry of the asymmetric texture presented. Its mod 13 arithmetic distinguishes each Yukawa matrix element of the texture. We constr…
View article: Modifications of the Page Curve from correlations within Hawking radiation
Modifications of the Page Curve from correlations within Hawking radiation Open
View article: Stitching an Asymmetric Texture with $\mathcal{T}_{13}$
Stitching an Asymmetric Texture with $\mathcal{T}_{13}$ Open
We propose $\mathcal{T}_{13} = \mathcal{Z}_{13} \rtimes \mathcal{Z}_3$ as the underlying non-Abelian discrete family symmetry of the asymmetric texture presented in arXiv:1805.10684 [hep-ph]. Its mod 13 arithmetic distinguishes each Yukawa…