A5068304738- Particle physics theoretical and experimental studies
- Neutrino Physics Research
- Dark Matter and Cosmic Phenomena
- Cosmology and Gravitation Theories
- Black Holes and Theoretical Physics
- Astrophysics and Cosmic Phenomena
- Quantum Chromodynamics and Particle Interactions
- Computational Physics and Python Applications
- Algorithms and Data Compression
- High-Energy Particle Collisions Research
- Galaxies: Formation, Evolution, Phenomena
- Particle Detector Development and Performance
- RNA and protein synthesis mechanisms
- Opinion Dynamics and Social Influence
- Spaceflight effects on biology
- Fractal and DNA sequence analysis
- Radio Astronomy Observations and Technology
- Statistical Mechanics and Entropy
- Contact Mechanics and Variational Inequalities
- Scientific Research and Discoveries
- Laser-induced spectroscopy and plasma
- Electrohydrodynamics and Fluid Dynamics
- Error Correcting Code Techniques
- Noncommutative and Quantum Gravity Theories
- Quantum chaos and dynamical systems
Universidade Federal do ABC
2019-2024
National Yunlin University of Science and Technology
2021
Universidade de São Paulo
2011-2019
Pontifical Catholic University of Rio de Janeiro
2018
Fermi National Accelerator Laboratory
2017
Jamia Millia Islamia
2015
Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati
2012-2014
Stony Brook University
2008-2011
State University of New York
2009-2011
Michigan Technological University
2007
Abstract Neutrinos are one of the most promising messengers for signals new physics Beyond Standard Model (BSM). On theoretical side, their elusive nature, combined with unknown mass mechanism, seems to indicate that neutrino sector is indeed opening a window physics. experimental several long-standing anomalies have been reported in past decades, providing strong motivation thoroughly test standard three-neutrino oscillation paradigm. In this Snowmass21 white paper, we explore potential...
The focus of this paper lies on the possible experimental tests leptogenesis scenarios. We consider both generated from oscillations, as well out-of-equilibrium decays. As Akhmedov–Rubakov–Smirnov (ARS) mechanism allows for heavy neutrinos in GeV range, opens up a plethora tests, e.g. at neutrino oscillation experiments, neutrinoless double beta decay, and direct searches neutral leptons future facilities. In contrast, testing decays is quite difficult task. comment necessary conditions...
We explore the interplay between light primordial black holes (PBH) and high-scale baryogenesis, with a particular emphasis on leptogenesis. first review generic baryogenesis scenario where heavy particle, $X$, mass, ${M}_{X}$, produced solely from PBH evaporation decays to generate baryon asymmetry. show that viable parameter space is bounded above by ${M}_{X}\ensuremath{\lesssim}{10}^{17}\text{ }\text{ }\mathrm{GeV}$ increases decreasing ${M}_{X}$. demonstrate regions of leptogenesis...
Leptogenesis is a class of scenarios in which the cosmic baryon asymmetry originates from an initial lepton generated decays heavy sterile neutrinos early Universe. We explain why leptogenesis appealing mechanism for baryogenesis. review its motivations and basic ingredients describe subclasses effects, like those flavours, spectator processes, scatterings, finite temperature corrections, role heavier neutrinos, quantum corrections. then address supersymmetric scenarios, as well some other...
If leptonic unitarity is violated by new physics at an energy scale much lower than the electroweak scale, which we call low-scale violation, it has different characteristic features from those expected in violation high-energy scales. They include maintaining flavor universality and absence of zero-distance transition. We present a framework for testing such low energies neutrino oscillation experiments. Starting unitary 3 active plus $N$ (arbitrary integer) sterile model show that...
A bstract We study the generation of baryon asymmetry in Composite Higgs models with partial compositeness Standard Model (SM) fermions and heavy right-handed neutrinos, developing for first time a complete picture leptogenesis that setup. The is induced by out equilibrium decays neutrinos into plasma nearly conformal field theory (CFT), i.e. deconfined phase dynamics. This exotic mechanism, which we call Conformal Leptogenesis , admits reliable description terms set “Boltzmann equations”...
A bstract The parameter space of freeze-in dark matter (DM) with mass m χ through light photon (“minimal DM”) is currently being probed by direct detection experiments electron and nuclear recoil. Exploring the DM production in range 10 − 2 MeV < 3 TeV, we quantify impact quantum statistics reheating dynamics (beyond instantaneous approximation) on early universe, particular, dependence cosmic equation state scaling temperature Standard Model bath during reheating. Special cases...
We discuss possible interpretations of the 37 high energy neutrino events observed by IceCube experiment in South Pole. examine possibility to explain spectrum exclusively decays a heavy long-lived particle mass PeV range. compare this with standard scenario, namely, single power-law related neutrinos produced astrophysical sources and viable hybrid situation where is product two components: decays. present simple extension Standard Model that could account for are needed order data. show...
A bstract We present a comprehensive study of the three-active plus N sterile neutrino model as framework for constraining leptonic unitarity violation induced at energy scales much lower than electroweak scale. formulate perturbation theory with expansion in small violating matrix element W while keeping (non- suppressed) matter effect to all orders. show that under same condition state masses 0.1 eV 2 ≲ m J (1–10) GeV vacuum, assuming typical accelerator based long-baseline oscillation...
We consider the see-saw mechanism within a nonsupersymmetric SO(10) model. By assuming quark-lepton symmetry, and after imposing suitable conditions that ensure right-handed neutrino masses are at most mildly hierarchical (compact spectrum) we obtain surprisingly predictive scenario. The absolute mass scale, Dirac two Majorana phases of mixing matrix remain determined in terms set already measured low energy observables, modulo discrete ambiguity signs angles phase. spectrum is also...
Abstract Since the gravitational interaction is universal, any particle that ever existed, if kinematically accessible, has to be produced through her. We explore possibility dark matter generated purely from scatterings together with heavy Majorana right-handed neutrinos are long-lived. Their late decay could inject significant entropy into thermal bath, diluting both abundance and cosmic baryon asymmetry, thereby imposing various constraints on reheating dynamics. Additionally injection,...
A ${\cal G}_{\cal F}=SU(3)_{Q}\times SU(3)_{u}\times SU(3)_{d}$ invariant scalar potential breaking spontaneously the quark flavor symmetry can explain standard model puzzle. The approximate alignment in space of vacuum expectation values up and down ``Yukawa fields'' is explained as a dynamical effect, observed mixing angles, weak CP violating phase, hierarchical masses be reproduced without introducing parameters.
The cosmological matter-antimatter asymmetry can arise from the baryon number conserving CP in two body decays of heavy particles, when final states carry equal and opposite number, one couples directly or indirectly to electroweak sphalerons so that its gets partly reprocessed into a lepton asymmetry, while other remains chemically decoupled thermal bath with content frozen. After sphaleron switchoff decay particles inject plasma an unbalanced giving rise baryogenesis. We highlight features...
We present an explicit computation of the CP asymmetry in scattering processes involving heavy right-handed neutrinos type I seesaw framework and Standard Model gauge bosons. Compared to violation two-body decays scatterings with top quarks there are new contributions at one loop form vertex corrections as well box diagrams. show that their presence implies that, unlike quarks, bosons is different from decay even for hierarchical neutrinos. This also holds L-conserving U(1)Y Quantitatively...
Soft leptogenesis is a scenario in which the cosmic baryon asymmetry produced from lepton generated decays of heavy sneutrinos (the partners singlet neutrinos seesaw) and where relevant sources CP violation are complex phases soft supersymmetry-breaking terms. We explain motivations for leptogenesis, review its basic ingredients: different CP-violating contributions, crucial role played by thermal corrections, enhancement efficiency flavor effects. also discuss high temperature regime T >...
Discrete Abelian symmetries (${\mathbb{Z}}_{N}$) are a common ``artifact'' of beyond the standard model physics models. They provide different avenues for constructing consistent scenarios lepton and quark mixing patterns, radiative neutrino mass generation as well dark matter stabilization. We argue that these can arise from spontaneous breaking $U(1)$ factors contained in global flavor symmetry transformations gauge-invariant kinetic Lagrangian. This will be case provided ultraviolet...
We describe a simple experiment to observe the fission of an electrically charged liquid droplet. Rayleigh charge instability occurs when electrostatic repulsion charges on surface droplet overcomes tension and tears apart. The requires low-power laser, optics, CCD camera, quadrupole trap, which can be constructed using widely available relatively straightforward instructions. was performed primarily by undergraduates as part their senior research projects implemented readily in advanced...
We study leptogenesis in the supersymmetric standard model plus seesaw. identify important qualitative differences that characterize with respect to non-supersymmetric case. The lepton number asymmetries fermions and scalars do not equilibrate, are related via a non-vanishing gaugino chemical potential. Due presence of new anomalous symmetries, electroweak sphalerons couple winos higgsinos, QCD gluinos, thus modifying corresponding equilibrium conditions. A constraint on particles potentials...
In this work, we investigate a scenario in which heavy Majorana Right-Handed Neutrinos (RHNs) are thermal equilibrium with dark sector temperature higher than the Standard Model (SM) bath. Specifically, consider Dark Matter (DM) abundance is fixed from freeze-out of DM annihilations into RHNs. Due to inert nature RHNs, show that it possible for two sectors remain thermally decoupled by having more generations The hotter implies abundances and RHNs following consequences. For leptogenesis, an...
A bstract We develop an extension of the basic inverse seesaw model which addresses simultaneously two its drawbacks, namely, lack explanation tiny Majorana mass term μ for TeV-scale singlet fermions and difficulty in achieving successful leptogenesis. Firstly, we investigate systematically leptogenesis within (and related linear) models show that a scenario requires either small Yukawa couplings, implying loss experimental signals, and/or quasi-degeneracy among singlets different...
We consider SO(10) Grand Unified Theories (GUTs) with vacuum expectation values (vevs) for fermion masses in the $$ \mathbf{10}+\overline{\mathbf{126}} representation. show that baryon asymmetry generated via leptogenesis is completely determined terms of measured low energy observables and one single high parameter related to ratio 10 \overline{\mathbf{126}} SU(2) doublet vevs. identify new decay channels heavy Majorana neutrinos into singlet leptons e c which can sizeably affect size...