A5088703813- Neutrino Physics Research
- Astrophysics and Cosmic Phenomena
- Particle physics theoretical and experimental studies
- Dark Matter and Cosmic Phenomena
- Gamma-ray bursts and supernovae
- Quantum, superfluid, helium dynamics
- Cosmology and Gravitation Theories
- Cold Atom Physics and Bose-Einstein Condensates
- Nuclear physics research studies
- Particle accelerators and beam dynamics
- Advanced Thermodynamics and Statistical Mechanics
- Superconducting Materials and Applications
- Quantum Information and Cryptography
- Data Quality and Management
- Advanced NMR Techniques and Applications
- Solar and Space Plasma Dynamics
- Quantum chaos and dynamical systems
- Quantum many-body systems
- Big Data Technologies and Applications
- Computational Physics and Python Applications
- Strong Light-Matter Interactions
- Radio Astronomy Observations and Technology
- Research Data Management Practices
- Scientific Research and Discoveries
- Atomic and Subatomic Physics Research
University of Minnesota System
2024-2025
SLAC National Accelerator Laboratory
2021-2024
University of Minnesota
2024
University of California, Berkeley
2019-2021
University of Washington
2020-2021
Menlo School
2021
University of Wisconsin–Madison
2019
University of California, San Diego
2014-2017
We present a comprehensive review of keV-scale sterile neutrino Dark Matter, collecting views and insights from all disciplines involved - cosmology, astrophysics, nuclear, particle physics in each case viewed both theoretical experimental/observational perspectives. After reviewing the role active neutrinos physics, we focus on context Matter puzzle. Here, first motivation for based challenges tensions purely cold scenarios. then round out discussion by critically summarizing known...
Abstract In high-energy astrophysical processes involving compact objects, such as core-collapse supernovae or binary neutron star mergers, neutrinos play an important role in the synthesis of nuclides. Neutrinos these environments can experience collective flavor oscillations driven by neutrino–neutrino interactions, including coherent forward scattering and incoherent (collisional) effects. Recently, there has been interest exploring potential novel behaviors going beyond one-particle...
We present a model where sterile neutrinos with rest masses in the range $\ensuremath{\sim}\mathrm{keV}$ to $\ensuremath{\sim}\mathrm{MeV}$ can be dark matter and consistent all laboratory, cosmological, large-scale structure, as well x-ray constraints. These are assumed freeze out of thermal chemical equilibrium radiation very early Universe, prior an epoch prodigious entropy generation (``dilution'') from out-of-equilibrium decay heavy particles. In this work, we consider heavy,...
We investigate the importance of going beyond mean-field approximation in dynamics collective neutrino oscillations. To expand our understanding coherent oscillation problem, we apply concepts from many-body physics and quantum information theory. Specifically, use measures nontrivial correlations (otherwise known as ``entanglement'') between constituent neutrinos system, such entanglement entropy Bloch vector reduced density matrix. The relevance mean field is demonstrated by comparisons...
In environments such as core-collapse supernovae, neutron star mergers, or the early universe, where neutrino fluxes can be extremely high, neutrino-neutrino interactions are appreciable and contribute substantially to their flavor evolution. Such a system of interacting neutrinos regarded quantum many-body system, prospects for nontrivial correlations, i.e., entanglement, developing in gas have been investigated previously. this work, we uncover an intriguing connection between entropy...
If a system of flavor-oscillating neutrinos is at high enough densities that neutrino-neutrino coherent forward scatterings are non-negligible, the becomes time-dependent many-body problem. An important and open question whether flavor evolution sufficiently described by mean-field approach or can be strongly affected correlations arising from two-body interactions in neutrino Hamiltonian, as measured nontrivial quantum entanglement. Numerical computations time systems challenging because...
The flavor evolution of neutrinos in environments with large neutrino number densities is an open problem at the nexus astrophysics and physics. Among many unanswered questions pertaining to this problem, it remains be determined whether neutrino-neutrino coherent scattering can give rise nontrivial quantum entanglement among neutrinos, affect a meaningful way. To gain further insight into question, here we study simple system two interacting beams, obtain exact phase-space explored by using...
In environments with prodigious numbers of neutrinos, such as core-collapse supernovae, neutron star mergers, or the early universe, neutrino-neutrino interactions are dynamically significant. They can dominate neutrino flavor evolution and force it to be nonlinear, causing collective oscillations. Such oscillations have been studied numerically, for systems up millions using mean-field one-particle effective approximations. However, a system interacting neutrinos is quantum many-body...
Abstract The origin of the solar system abundances several proton-rich isotopes, especially 92,94 Mo and 96,98 Ru, has been an enduring mystery in nuclear astrophysics. An attractive proposal to solve this problem is νp -process, which can operate neutrino-driven outflows a core-collapse supernova after shock launched. Years detailed studies, however, have cast doubt over ability process generate sufficiently high absolute relative amounts various p -nuclei. -process also thought be excluded...
We demonstrate a method to systematically obtain eigenvalues and eigenstates of many-body Hamiltonian describing collective neutrino oscillations. The is derived from the Richardson-Gaudin framework, which involves casting eigenproblem as set coupled nonlinear "Bethe Ansatz equations", solutions can then be used parametrize eigenvectors. specific approach outlined in this paper consists defining auxiliary variables that are related Bethe-Ansatz parameters, thereby transforming equations into...
We examine the flavor evolution of neutrinos emitted from disklike remnant (hereafter called ``neutrino disk'') a binary neutron star (BNS) merger. specifically follow center disk, along polar axis perpendicular to equatorial plane. carried out two-flavor simulations using variety different possible initial neutrino luminosities and energy spectra and, for comparison, three-flavor in specific cases. In all simulations, normal mass hierarchy was used. The found be highly dependent on spectra;...
We show that a particular class of postrecombination phase transitions in the vacuum can lead to localized overdense regions on relatively small scales, roughly ${10}^{6}$ ${10}^{10}{M}_{\ensuremath{\bigodot}}$, potentially interesting for origin large black hole seeds and dwarf galaxy evolution. Our study suggests this mechanism could operate over range conditions which are consistent with current cosmological laboratory bounds. One byproduct transition bubble-wall decay may be extra...
We present neutrino bulb model simulations of Majorana coherent spin transformation (i.e., neutrino-antineutrino transformation), coupled to flavor evolution, for conditions corresponding the neutronization burst epoch an oxygen-neon-magnesium core collapse supernova. Significant in, example, could alter fluences neutrinos and antineutrinos in a way which is potentially detectable Galactic Our calculations first time incorporate geometric dilution evolution combine two-flavor three-flavor...
We assess the utility of an optimization-based data assimilation (D.A.) technique for treating problem nonlinear neutrino flavor transformation in core-collapse supernovae. D.A. uses measurements obtained from a physical system to estimate state variable evolution and parameter values associated model. Formulated as optimization procedure, can offer integration-blind approach predicting model evolution, which offers advantage models that thwart solution via traditional numerical integration...
We present a mechanism for producing cosmologically-significant relic density of one or more sterile neutrinos. This scheme invokes two steps: First, population "heavy" neutrinos is created by scattering-induced decoherence active neutrinos; Second, this transferred, via neutrino self-interaction-mediated scatterings and decays, to lighter mass ($\sim 10\,{\rm keV}$ $\sim 1\,{\rm GeV}$) that are far weakly (or not at all) mixed with species could constitute dark matter. Dark matter produced...
Understanding the physics of deep solar interior, and more exotic environs core-collapse supernovae (CCSN) binary neutron-star (NS) mergers, is keen interest in many avenues research. To date, this based largely on simulations via forward integration. While these provide valuable constraints, it could be insightful to adopt ``inverse approach'' as a point comparison. Within paradigm, parameters interior are not output an assumed model, but rather inferred real data. We take specific case...
In preparation for the 2023 NSAC Long Range Plan (LRP), members of Nuclear Science community gathered to discuss current state of, and plans further leveraging opportunities in, QIST in NP research at Quantum Information U.S. Physics Planning workshop, held Santa Fe, New Mexico on January 31 - February 1, 2023. The workshop included 45 in-person participants 53 remote attendees. outcome identified strategic requirements next 5-10 years advance quantum sensing simulations within NP, develop a...
The multimessenger astrophysics of compact objects presents a vast range environments where neutrino flavor transformation may occur and be important for nucleosynthesis, dynamics, detected signal. Development efficient techniques surveying evolution solution spaces in these diverse environments, which augment complement existing sophisticated computational tools, could leverage progress this field. To end we continue our exploration statistical data assimilation (SDA) to identify solutions...
The evolution of neutrino flavor in dense environments such as core-collapse supernovae and binary compact object mergers constitutes an important unsolved problem. Its solution has potential implications for the dynamics heavy-element nucleosynthesis these environments. In this paper, we build upon recent work to explore inference-based techniques estimation model parameters histories. We combine data assimilation, ordinary differential equation solvers, neural networks craft inference...
We consider systems where dynamical variables are the generators of SU(2) group. A subset these Hamiltonians is exactly solvable using Bethe ansatz techniques. show that equations equivalent to polynomial relationships between operator invariants, or equivalently, eigenvalues those invariants.
We continue examining statistical data assimilation, an inference methodology, to infer solutions neutrino flavor evolution, for the first time using real---rather than simulated---data. The model represents neutrinos streaming from Sun's center and undergoing a Mikheyev-Smirnov-Wolfenstein resonance in space, due radially varying electron number density. energies are chosen correspond experimental bins Sudbury Neutrino Observatory Borexino experiments, which measure electron-flavor survival...