A5101866408- Cosmology and Gravitation Theories
- Particle physics theoretical and experimental studies
- Dark Matter and Cosmic Phenomena
- Astrophysics and Cosmic Phenomena
- Neutrino Physics Research
- Quantum Chromodynamics and Particle Interactions
- Pulsars and Gravitational Waves Research
- High-Energy Particle Collisions Research
- Topological Materials and Phenomena
- Physics of Superconductivity and Magnetism
- Computational Physics and Python Applications
- Radio Astronomy Observations and Technology
- Graphene research and applications
- Relativity and Gravitational Theory
- High-pressure geophysics and materials
- Astronomy and Astrophysical Research
- Quantum and electron transport phenomena
- 2D Materials and Applications
- Advanced Thermodynamics and Statistical Mechanics
- Solar and Space Plasma Dynamics
- Quantum, superfluid, helium dynamics
- Galaxies: Formation, Evolution, Phenomena
University of Notre Dame
2021-2024
Menlo School
2022
SLAC National Accelerator Laboratory
2022
Tata Institute of Fundamental Research
2018-2022
Notre Dame of Dadiangas University
2020
Flavor-universal neutrino self-interaction has been shown to ease the tension between values of Hubble constant measured from early and late Universe data. We introduce a structure that is flavor-specific in three active framework. This motivated by stringent constraints on new secret interactions among electron muon neutrinos several laboratory experiments. Our study indicates presence strongly interaction mode which implies late-decoupling just prior matter radiation equality. Using...
In this paper, we study a possible early universe source for the recent observation of stochastic gravitational wave background at NANOGrav pulsar timing array. The is tachyonic instability in dark gauge field induced by an axionlike particle (ALP), known waves. We find that relative to previous analysis with 12.5-year dataset, current 15-year dataset favors parameter space relatively larger axion mass and decay constant. This favored heavily constrained <a:math...
New interactions of neutrinos can stop them from free streaming even after the weak interaction freeze-out. This results in a phase shift cosmic microwave background (CMB) acoustic peaks which alleviate Hubble tension. In addition, perturbations do not decay away on horizon entry and contribute to metric perturbation enhancing matter power spectrum. We demonstrate that this be achieved using new standard left-handed with dark without changing number effective relativistic degrees freedom....
Dark radiation (DR) appears as a new physics candidate in various scenarios beyond the Standard Model. While it is often assumed that perturbations DR are adiabatic, they can easily have an isocurvature component if more than one field was present during inflation, and whose decay products did not all thermalize with each other. By implementing appropriate initial conditions (IC), we derive constraints on both uncorrelated correlated density from full Planck 2018 data alone, also combination...
Abstract A phase shift in the acoustic oscillations of cosmic microwave background (CMB) spectra is a characteristic signature for presence non-photon radiation propagating differently from photons, even when couples to Standard Model particles solely gravitationally. It well-established that compared free-streaming radiation, CMB higher ℓ -modes self-interacting such as neutrinos and dark radiation. In this study, we further demonstrate scattering with matter can amplify shift. We show...
Abstract We revisit the cosmology of neutrino self-interaction and use latest cosmic microwave background data from Atacama Cosmology Telescope (ACT) Planck experiment to constrain interaction strength. In both flavor-universal nonuniversal coupling scenarios, we find that ACT prefers strong delays free streaming until just before matter-radiation equality. When combined with 2018 data, preference for decreases due polarization data. For dataset, flavor-specific still provides a better fit...
New interactions of neutrinos can stop them from free streaming in the early Universe even after weak decoupling epoch. This results enhancement primordial gravitational wave amplitude on small scales compared to standard $\Lambda$CDM prediction. In this paper we calculate effect dark matter neutrino CMB tensor $B$-modes spectrum. We show that new generates a scale or $\ell$ dependent imprint power spectrum at $\ell \gtrsim 100$. event are detected by future experiments, departure...
Self-interaction among the neutrinos in early Universe has been proposed as a solution to Hubble tension, discrepancy between measured values of constant from CMB and low-redshift data. However, flavor-universal neutrino self-interaction is highly constrained by Big Bang Nucleosynthesis other laboratory experiments such as, tau K-meson decay, double-neutrino beta decay etc. We study cosmology when only one or two states are self-interacting. Such flavor-specific interactions less...
A light axionlike particle or an (ALP) not just gives rise to interesting and spectacular signals of new physics as final states in meson decays, it necessarily leaves tell-tale signatures processes that involve standard model (SM) fields only (i.e., SM processes). These effects result the violation Gell-Mann-Okubo mass relation, modified form factors, altered integrated differential rates for various transitions etc. This suggests presence a low lying state, such ALP, extraction masses,...
In this paper we present an augmented version of the Abelian scalar clockwork model to generate geometrically suppressed vacuum expectation values (vev) pseudo Nambu-Goldstone bosons, that call clockworked vevs. We briefly comment on generalization setup and possible 5D UV realizations. demonstrate how tiny neutrino mass can be generated by clockworking a weak scale vev.
We propose a manifestly gauge invariant effective tensor operator that can account for the $ CP asymmetry anomaly in \tau decays, contrary to claim made literature. Additionally, this also help resolving long-standing discrepancy value of V_{us} extracted from inclusive decays. By construction, evades bounds neutron electric dipole moment, while keeping extraction exclusive decays unaffected. explicitly provide renormalizable model flavor symmetries yields desired operator.
A phase shift in the acoustic oscillations of cosmic microwave background (CMB) spectra is a characteristic signature for presence non-photon radiation propagating differently from photons, even when couples to Standard Model particles solely gravitationally. It well-established that compared free-streaming radiation, CMB higher $\ell$-modes self-interacting such as neutrinos and dark radiation. In this study, we further demonstrate scattering with matter can amplify shift. We show energy...
In this work, we study the cosmological effects of a tower warm dark matter states on cosmic microwave background (CMB) and large-scale structure (LSS). For concreteness, consider $N$naturalness model, which is proposed mechanism to solve Higgs hierarchy problem. framework, sector particles Standard Model copied $N$ times where mass-squared value only parameter that changes between sectors. The other sectors are similar our own, except their proportionally heavier cooler compared sector....
In this paper, we study a possible early universe source for the recent observation of stochastic gravitational wave background at NANOGrav pulsar timing array. The is tachyonic instability in dark gauge field induced by an axion-like particle (ALP), known waves. We find that relative to previous analysis with 12.5-year data set, current 15-year set favors parameter space relatively larger axion mass and decay constant. This favored heavily constrained $\Delta N_{\rm eff}$ overproduction ALP...
In $ \Lambda $CDM cosmology neutrinos start free-streaming after weak decoupling epoch and contribute to the damping of Primordial gravitational waves entering horizon. New interactions can stop from free-streaming, therefore, enhance primordial at small scale. This leads enhancement CMB - B mode compared higher multipoles ($ \ell $). mimics blue initial spectrum waves. Therefore departure scale invariance, if observed in future observations modes, be a signature non-standard neutrino...
We revisit the cosmology of neutrino self-interaction and use latest cosmic microwave background data from Atacama Cosmology Telescope (ACT) Planck experiment to constrain interaction strength. In both flavor-universal nonuniversal coupling scenarios, we find that ACT prefers strong delays free streaming until just before matter-radiation equality. When combined with 2018 data, preference for decreases due polarization data. For dataset, flavor-specific still provides a better fit CMB than...
We report the results of polarization-dependent Raman spectroscopy phonon states in single-crystalline quasi-one-dimensional NbTe$_4$ and TaTe$_4$ van der Waals materials. The measurements were conducted wide temperature range from 80 K to 560 K. Our show that although both materials have identical crystal structures symmetries, there is a drastic difference intensity their spectra. While TaTe4 exhibits well-defined peaks through examined frequency ranges, NbTe4 reveals extremely weak...
We report on low-frequency current fluctuations, i.e. electronic noise, in quasi-one-dimensional (TaSe$_4$)$_2$I Weyl semimetal nanoribbons. It was found that the noise spectral density is of 1/f type and scales with square current, S~I^2 (f frequency). The increases by almost an order magnitude develops Lorentzian features near temperature T~225 K. These changes were attributed to charge-density-wave phase transition even though maximum deviates from reported Peierls bulk crystals. level,...
In addition to giving rise spectacular new physics signals in the final states of meson decays, Axion-like-particles also induce modifications standard model decays mesons. These `indirect' signatures can be parametrized as hadronic form factors and probed using decay width distribution measurements. Starting with a generalized ALP Lagrangian, we demonstrate these effects for semileptonic Kaon derived bounds NA48/2 data. We briefly discuss other indirect such modification mass spectrum `sum...
We show how a light axion-like particle (ALP) leaves tell-tale signatures in processes that involve standard model (SM) fields only (i.e., SM processes). These include the violation of Gell-Mann--Okubo mass relation, modification form factors, alteration differential rates for various transitions, give rise to novel sum rules etc. Therefore, presence an ALP, extractions masses, mixing angles, and factors data-driven way provide important (indirect) bounds on ALP physics. remain valid limits...
A light axion-like particle or an ALP not just gives rise to interesting and spectacular signals of new physics as final states in meson decays, it necessarily leaves tell-tale signatures processes that involve standard model (SM) fields only (i.e., SM processes). These effects result the violation Gell-Mann--Okubo mass relation, modified form factors, altered integrated differential rates for various transitions etc. This suggests presence a low lying state, such ALP, extraction masses,...