280 citations · 1.4k across the 35 of their papers we have counts for
31 papers · 1 filter
Neutrino transport and flavor instabilities in a post-merger disk
Erick Urquilla, Swapnil Shankar, Debraj Kundu +6
Neutron star mergers are multimessenger sources whose dynamics and signals depend critically on neutrinos and their flavor transformations. We investigate whether fast and collisio…
Neutrino flavor instabilities in neutron star mergers with moment transport: Slow, fast, and collisional modes
Julien Froustey, Francois Foucart, Christian Hall +5
Determining where, when, and how neutrino flavor oscillations must be included in large-scale simulations of hot and dense astrophysical environments is an enduring challenge that…
Two-beam Multiparticle Many-body simulations of Inhomogeneous FFI
Zoha Laraib, Sherwood Richers
Neutrino flavor evolution in dense astrophysical environments is inherently nonlinear and sensitive to many-body (MB) quantum effects beyond the mean-field (MF) approximation. Exis…
Impact of Neutrino Flavor Conversions on Neutron Star Merger Dynamics, Ejecta, Nucleosynthesis, and Multi-Messenger Signals
Yi Qiu, David Radice, Sherwood Richers +3
We present numerical relativity simulations of binary neutron star mergers incorporating neutrino flavor transformations triggered by fast flavor instability, quantum many-body eff…
Many-Body Simulations of the Fast Flavor Instability
Zoha Laraib, Sherwood Richers
The neutrino fast flavor instability dominates the evolution of neutrino flavor within the engines of core-collapse supernovae and neutron star mergers. However, theoretical models…
Neutrino Flavor Transformation in Neutron Star Mergers
Yi Qiu, David Radice, Sherwood Richers +1
We present the first numerical relativity simulations including neutrino flavor transformations that could result from flavor instabilities, quantum many-body effects, or potential…
Neutrino Oscillations in Core-Collapse Supernovae and Neutron Star Mergers
Lucas Johns, Sherwood Richers, Meng-Ru Wu
Accurate neutrino transport is crucial for reliably modeling explosive astrophysical events like core-collapse supernovae (CCSNe) and neutron star mergers (NSMs). However, in these…
Advection Algorithms for Quantum Neutrino Moment Transport
Evan Grohs, Sherwood Richers, Julien Froustey +3
Neutrino transport in compact objects is an inherently challenging multi-dimensional problem. This difficulty is compounded if one includes flavor transformation -- an intrinsicall…
Asymptotic-state prediction for fast flavor transformation in neutron star mergers
Sherwood Richers, Julien Froustey, Somdutta Ghosh +2
Neutrino flavor instabilities appear to be omnipresent in dense astrophysical environments, thus presenting a challenge to large-scale simulations of core-collapse supernovae and n…
Inspecting neutrino flavor instabilities during proto-neutron star cooling phase in supernova: I. Spherically symmetric model
Masamichi Zaizen, Sherwood Richers, Hiroki Nagakura +2
In the standard model of core-collapse supernova (CCSN), all neutrinos are assumed to be in pure flavor eigenstates in CCSN cores, but the assumption becomes invalid if neutrino di…
Three-flavor, Full Momentum Space Neutrino Spin Oscillations in Neutron Star Mergers
Henry Purcell, Sherwood Richers, Amol V. Patwardhan +1
In the presence of anisotropic neutrino and antineutrino fluxes, the quantum kinetic equations drive coherent oscillations in neutrino helicity, frequently referred to as spin osci…
Neutrino flavor transformation with moments: application to fast flavor instabilities in neutron star mergers
Julien Froustey, Sherwood Richers, Evan Grohs +4
Neutrino evolution, of great importance in environments such as neutron star mergers (NSMs) because of their impact on explosive nucleosynthesis, is still poorly understood due to…
Chaos in Inhomogeneous Neutrino Fast Flavor Instability
Erick Urquilla, Sherwood Richers
In dense neutrino gases, the neutrino-neutrino coherent forward scattering gives rise to a complex flavor oscillation phenomenon not fully incorporated in simulations of neutron st…
Neutrino fast flavor oscillations with moments: linear stability analysis and application to neutron star mergers
Julien Froustey, Sherwood Richers, Evan Grohs +4
Providing an accurate modeling of neutrino physics in dense astrophysical environments such as binary neutron star mergers presents a challenge for hydrodynamic simulations. Nevert…
Two-Moment Neutrino Flavor Transformation with applications to the Fast Flavor Instability in Neutron Star Mergers
Evan Grohs, Sherwood Richers, Sean M. Couch +4
Multi-messenger astrophysics has produced a wealth of data with much more to come in the future. This enormous data set will reveal new insights into the physics of core collapse s…
Bayesian inference from gravitational waves in fast-rotating, core-collapse supernovae
Carlos Pastor-Marcos, Pablo Cerdá-Durán, Daniel Walker +4
Core-collapse supernovae (CCSNe) are prime candidates for gravitational-wave detectors. The analysis of their complex waveforms can potentially provide information on the physical…
Fast Flavor Transformations
Sherwood Richers, Manibrata Sen
The neutrino fast flavor instability (FFI) can change neutrino flavor on time scales of nanoseconds and length scales of centimeters. It is expected to be ubiquitous in core-collap…
The Fast Flavor Instability in Hypermassive Neutron Star Disk Outflows
Rodrigo Fernández, Sherwood Richers, Nicole Mulyk +1
We examine the effect of neutrino flavor transformation by the fast flavor instability (FFI) on long-term mass ejection from accretion disks formed after neutron star mergers. Neut…
Evaluating Approximate Flavor Instability Metrics in Neutron Star Mergers
Sherwood Richers
Neutrinos can rapidly change flavor in the inner dense regions of core-collapse supernovae and neutron star mergers due to the neutrino fast flavor instability. If the amount of fl…
Code Comparison for Fast Flavor Instability Simulation
Sherwood Richers, Huaiyu Duan, Meng-Ru Wu +5
The fast flavor instability (FFI) is expected to be ubiquitous in core-collapse supernovae and neutron star mergers. It rapidly shuffles neutrino flavor in a way that could impact…
The Neutrino Fast Flavor Instability in Three Dimensions
Sherwood Richers, Donald Willcox, Nicole ford
Neutrino flavor instabilities have the potential to shuffle neutrinos between electron, mu, and tau flavor states, modifying the core-collapse supernova mechanism and the heavy ele…
Particle-in-cell Simulation of the Neutrino Fast Flavor Instability
Sherwood Richers, Don E. Willcox, Nicole M. Ford +1
Neutrinos drive core-collapse supernovae, launch outflows from neutron star merger accretion disks, and set the ratio of protons to neutrons in ejecta from both systems that genera…
Rank-3 Moment Closures in General Relativistic Neutrino Transport
Sherwood Richers
Many modern simulations of accretion disks use moment-based methods for radiation transport to determine the thermal evolution of the disk and the properties of the ejected matter.…
Neutrino Quantum Kinetics in Compact Objects
Sherwood A. Richers, Gail C. McLaughlin, James P. Kneller +1
Neutrinos play a critical role of transporting energy and changing the lepton density within core-collapse supernovae and neutron star mergers. The quantum kinetic equations (QKEs)…