We propose a new method toward distinguishing the Dirac versus Majorana nature of neutrino masses from spectrum gravitational waves (GWs) associated with mass genesis. Motivated by principle generating small without tiny Yukawa couplings, we assume generic seesaw mechanisms for both and masses. For neutrinos, further spontaneously broken gauged <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mi>U</a:mi><a:mo stretchy="false">(</a:mo><a:mn>1</a:mn><a:msub><a:mo...

The four-point correlation function of primordial scalar perturbations has parity-even and parity-odd contributions the signal in cosmological observations is opening a novel window to look for new physics inflationary epoch. We study distinct even prediction from axion inflation model, which inflaton couples vector field via Chern-Simons interaction, considered be either approximately massless ($m_A \ll $ Hubble scale $H$) or very massive \sim H $). arises due one transverse mode being...

Several pulsar timing arrays including NANOGrav, EPTA, PPTA, and CPTA have recently reported the observation of a stochastic background gravitational wave spectrum in nanohertz frequencies. An inflationary interpretation this is challenging from various aspects. We report that such signal can arise Chern-Simons coupling axion inflation, where pseudoscalar inflaton couples to (massive) $U(1)$ gauge field, leading efficient production transverse mode. Such tachyonic particle during inflation...

Abstract We extend the reach of “cosmological collider” for massive gauge boson production during inflation from CMB scales to interferometer scales. Considering a Chern-Simons coupling between bosons and pseudoscalar inflaton, one transverse modes is efficiently produced its inverse decay leaves an imprint in primordial scalar tensor perturbations. study correlation functions these perturbations derive updated constraints on parameter space observables. then extrapolate power spectrum...

In the light of evidence a gravitational wave background from NANOGrav 15yr data set, we reconsider split majoron model as new physics extension standard able to generate needed contribution solve current tension between and interpretation in terms inspiraling supermassive black hole massive binaries. seesaw right-handed neutrinos acquire Majorana masses spontaneous symmetry breaking global $U(1)_{B-L}$ strong first order phase transition complex scalar field occurring above electroweak...

We construct a texture where the Seesaw matrix is diagonalized by TriBiMaximal (TBM) with phase. All CKM and PMNS angles are within their pdg values, mass relations of quarks charged leptons extrapolated to GUT scale satisfied, including Gatto relation. The novel ingredient asymmetry down-quark lepton Yukawa matrices. Explaining reactor angle requires $\require{cancel} \cancel {CP}$ phase in TBM matrix, resulting Jarlskog-Greenberg invariant at $|J|=0.028$, albeit an undetermined sign. While...

In the light of evidence a gravitational wave background from NANOGrav 15 yr dataset, we reconsider split Majoron model as new physics extension standard able to generate needed contribution solve current tension between data and interpretation in terms inspiraling supermassive black hole massive binaries. seesaw right-handed neutrinos acquire Majorana masses spontaneous symmetry breaking global <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mrow><a:mi>U</a:mi><a:mo...

We propose a new method towards distinguishing the Dirac versus Majorana nature of neutrino masses from spectrum gravitational waves (GWs) associated with mass genesis. Motivated by principle generating small without tiny Yukawa couplings, we assume generic seesaw mechanisms for both and masses. For neutrinos, further spontaneously broken gauged $U(1)_{B-L}$ symmetry, independently type mechanism, which gives cosmic string induced GW signal flat over wide range frequencies. spontaneous...

Several pulsar timing arrays including NANOGrav, EPTA, PPTA, and CPTA have recently reported the observation of a stochastic background gravitational wave spectrum in nano-Hz frequencies. An inflationary interpretation this is challenging from various aspects. We report that such signal can arise Chern-Simons coupling axion inflation, where pseudoscalar inflaton couples to (massive) $U(1)$ gauge field, leading efficient production transverse mode. Such tachyonic particle during inflation...

A bstract We explore the origin of Majorana masses within majoron model and how this can lead to generation a distinguishable primordial stochastic background gravitational waves. first show in simplest only contribution from cosmic string be reach planned experiments. then consider extensions containing multiple complex scalars, demonstrating case spectrum comprising contributions both strong order phase transition strings naturally emerge. that interplay between scalar fields amplify...

We numerically determine the cosmological branch of free function in a nonlocal metric-based modification gravity which provides relativistic generalization Milgrom's Modified Newtonian Dynamics. are able to reproduce $\Lambda$CDM expansion history over virtually all cosmic history, including era radiation domination during Big Bang Nucleosynthesis, matter Recombination, and most vacuum energy domination. The very late period $0 \leq z < 0.0880$, model deviates from is interesting because it...

We propose $\mathcal{T}_{13} = \mathcal{Z}_{13} \rtimes \mathcal{Z}_3$ as the underlying non-Abelian discrete family symmetry of asymmetric texture presented in arXiv:1805.10684 [hep-ph]. Its mod 13 arithmetic distinguishes each Yukawa matrix element texture. construct a model effective interactions that singles out asymmetry and equates, without fine-tuning, products down-quark charged-lepton masses at GUT-like scale.

We investigate nonresonant thermal leptogenesis in the context of $SU(5)\ifmmode\times\else\texttimes\fi{}{\mathcal{T}}_{13}$ ``asymmetric texture'', where both Dirac and Majorana $CP$ violation arise from a single phase tribimaximal seesaw mixing matrix. show that baryon asymmetry universe can be explained this model only when flavor effects are considered for right-handed neutrino masses $\mathcal{O}({10}^{11}--{10}^{12})\text{ }\text{ }\mathrm{GeV}$. The sign also determines previously...

We extend the recently proposed $SU(5)\ifmmode\times\else\texttimes\fi{}{\mathcal{T}}_{13}$ model for asymmetric texture to up-type quark and seesaw sectors. The hierarchical masses are generated from higher-dimensional operators involving family-singlet Higgses, gauge-singlet familons, vectorlike messengers. complex-tribimaximal mixing arises vacuum structure of a minimal number resulting in an alignment between Yukawa Majorana matrices formula. Introducing four right-handed neutrinos,...

In flavor models the vacuum alignment of flavons is typically achieved via <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mi>F</a:mi></a:math>-terms certain fields in supersymmetric limit. We propose a method for preserving such alignments, up to rescaling expectation values, even after softly breaking supersymmetry (and symmetry). This facilitates which are nonsupersymmetric at low energies. Examples with different groups, namely, <c:math...

A bstract The spontaneous breaking of a U(1) symmetry via an intermediate discrete may yield hybrid topological defect domain walls bounded by cosmic strings . decay this network leads to unique gravitational wave signal spanning many orders in observable frequencies, that can be distinguished from signals generated other sources. We investigate the production waves mechanism context type-I two-Higgs-doublet model extended R symmetry, simultaneously accommodates seesaw mechanism, anomaly...

A bstract Dark sectors provide beyond Standard Model scenarios which can address unresolved puzzles, such as the observed dark matter abundance or baryon asymmetry of Universe. naturally small portal to sector is obtained if dark-sector interactions stem from a non-Abelian hidden gauge group that couples through kinetic mixing with hypercharge boson. In this work, we investigate phenomenology dimension five in presence CP violation, focusing on its signatures fermion electric dipole moments....

Gravitational production of massive particles due to cosmic expansion can be significant during the inflationary and reheating period Universe. If particle also has non-gravitational interactions that do not significantly affect its production, numerous observational probes open up, including cosmological probes. In this work, we focus on gravitational light vector bosons couple feebly Standard Model (SM) particles. Due very feeble coupling, never reach thermal equilibrium, if Hubble scale...

We investigate low-scale resonant leptogenesis in an $SU(5)\ifmmode\times\else\texttimes\fi{}{\mathcal{T}}_{13}$ model where a single high-energy phase the complex tribimaximal seesaw mixing produces yet to be observed low-energy Dirac and Majorana $CP$ phases. A fourth right-handed neutrino, required generate viable light neutrino masses within this scenario, also turns out necessary for successful asymmetry is produced by same phase. derive lower bound on mass spectrum GeV range, part of...

We investigate quantum correlations between successive steps of black hole evaporation and whether they might resolve the information paradox. 'Small' corrections in various models were shown to be unable restore unitarity. study a toy qubit model that allows small reaffirm previous results. Then, we relax 'smallness' condition find nontrivial upper lower bound on entanglement entropy change during process. This gives quantitative measure size correction needed these bounds lead significant...

We present here two concrete examples of models where a sub-TeV scale breaking their respective ${\mathcal{T}}_{13}$ and ${A}_{5}$ flavor symmetries is able to account for the recently observed discrepancy in muon anomalous magnetic moment, $(g\ensuremath{-}2{)}_{\ensuremath{\mu}}$. Similarities structures charged-lepton Yukawa matrix dipole yielding $(g\ensuremath{-}2{)}_{\ensuremath{\mu}}$ give rise strong constraints on low-scale when bounds from lepton violation (LFV) are imposed. These...

The spontaneous breaking of a $U(1)$ symmetry via an intermediate discrete may yield hybrid topological defect "domain walls bounded by cosmic strings". decay this network leads to unique gravitational wave signal spanning many orders in observable frequencies, that can be distinguished from signals generated other sources. We investigate the production waves mechanism context type-I two-Higgs-doublet model extended $U(1)_R$ symmetry, simultaneously accommodates seesaw mechanism, anomaly...

Dark sectors provide beyond Standard Model scenarios which can address unresolved puzzles, such as the observed dark matter abundance or baryon asymmetry of Universe. A naturally small portal to sector is obtained if dark-sector interactions stem from a non-Abelian hidden gauge group that couples through kinetic mixing with hypercharge boson. In this work, we investigate phenomenology dimension five in presence CP violation, focusing on its signatures fermion electric dipole moments. We show...

A bstract We present the possibility that seesaw mechanism and nonthermal leptogenesis can be investigated via primordial non-Gaussianities in context of a majoron curvaton model. Originating as massless Nambu-Goldstone boson from spontaneous breaking global baryon ( B ) minus lepton L number symmetry at scale v B−L , becomes massive when it couples to new confining sector through anomaly. Acting curvaton, produces observed red-tilted curvature power spectrum without relying on any inflaton...

Parikh and Wilczek formulated Hawking radiation as quantum tunneling across the event horizon proving spectrum to be nonthermal. These nonthermality factors emerging due back reaction effects have been claimed responsible for correlations among emitted quanta. It has proposed by several authors in literature that these actually carry out information locked a black hole hence provide resolution long debated paradox. This paper demonstrates this is fallacious proposition. Finally, it...