G. C. McLaughlin
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View article: Kilonova Emissions from Neutron Star Merger Remnants: Implications for the Nuclear Equation of State
Kilonova Emissions from Neutron Star Merger Remnants: Implications for the Nuclear Equation of State Open
Multimessenger observations of binary neutron star mergers can provide valuable information on the nuclear equation of state (EOS). Here, we investigate the extent to which electromagnetic observations of the associated kilonovae allow us …
View article: Angle-dependent in Situ Fast Flavor Transformations in Post-neutron-star-merger Disks
Angle-dependent in Situ Fast Flavor Transformations in Post-neutron-star-merger Disks Open
The remnant black hole–accretion disk system resulting from binary neutron star mergers has proven to be a promising site for synthesizing the heaviest elements via rapid neutron capture ( r -process). A critical factor in determining the …
View article: Advection algorithms for quantum neutrino moment transport
Advection algorithms for quantum neutrino moment transport Open
Neutrino transport in compact objects is an inherently challenging multidimensional problem. Here, this difficulty is compounded if one includes flavor transformation—an intrinsically quantum phenomenon requiring one to follow the coherenc…
View article: Quantum closures for neutrino moment transport
Quantum closures for neutrino moment transport Open
A computationally efficient method for calculating the transport of neutrino flavor in simulations is to use angular moments of the neutrino one-body reduced density matrix, i.e., “quantum moments.” As with any moment-based radiation trans…
View article: Quantum maximum entropy closure for small flavor coherence
Quantum maximum entropy closure for small flavor coherence Open
Quantum angular moment transport schemes are an important avenue toward describing neutrino flavor mixing phenomena in dense astrophysical environments such as supernovae and merging neutron stars. Successful implementation will require ne…
View article: Mass measurements of neutron-rich nuclides using the Canadian Penning Trap to inform predictions in the $r$-process rare-earth peak region
Mass measurements of neutron-rich nuclides using the Canadian Penning Trap to inform predictions in the $r$-process rare-earth peak region Open
Studies aiming to determine the astrophysical origins of nuclei produced by the rapid neutron capture process ($r$ process) rely on nuclear properties as inputs for simulations. The solar abundances can be used as a benchmark for such calc…
View article: The Time Evolution of Fast Flavor Crossings in Postmerger Disks around a Black Hole Remnant
The Time Evolution of Fast Flavor Crossings in Postmerger Disks around a Black Hole Remnant Open
We postprocess a three-dimensional, general relativistic, full transport neutrino radiation magnetohydrodynamics simulation of the black-hole-accretion disk-wind system thought to be a potential outcome of the GW170817 merger to investigat…
View article: Quantum Closures for Neutrino Moment Transport
Quantum Closures for Neutrino Moment Transport Open
A computationally efficient method for calculating the transport of neutrino flavor in simulations is to use angular moments of the neutrino one-body reduced density matrix, i.e., `quantum moments'. As with any moment-based radiation trans…
View article: Quantum maximum entropy closure for small flavor coherence
Quantum maximum entropy closure for small flavor coherence Open
Quantum angular moment transport schemes are an important avenue toward describing neutrino flavor mixing phenomena in dense astrophysical environments such as supernovae and merging neutron stars. Successful implementation will require ne…
View article: Kilonova Emissions from Neutron Star Merger Remnants: Implications for Nuclear Equation of State
Kilonova Emissions from Neutron Star Merger Remnants: Implications for Nuclear Equation of State Open
Multi-messenger observation of binary neutron-star mergers can provide valuable information on the nuclear equation of state (EoS). Here, we investigate to which extent electromagnetic observations of the associated kilonovae allow us to p…
View article: Nuclear Uncertainties Associated with the Nucleosynthesis in Ejecta of a Black Hole Accretion Disk
Nuclear Uncertainties Associated with the Nucleosynthesis in Ejecta of a Black Hole Accretion Disk Open
The simulation of heavy element nucleosynthesis requires input from yet-to-be-measured nuclear properties. The uncertainty in the values of these off-stability nuclear properties propagates to uncertainties in the predictions of elemental …
View article: The time evolution of fast flavor crossings in post-merger disks around a black hole remnant
The time evolution of fast flavor crossings in post-merger disks around a black hole remnant Open
We postprocess a three-dimensional general relativistic, full transport neutrino radiation magnetohydrodynamics simulation of the black hole--accretion disk--wind system thought to be a potential outcome of the GW170817 merger to investiga…
View article: Nuclear uncertainties associated with the ejecta of a neutron-star black-hole accretion disk
Nuclear uncertainties associated with the ejecta of a neutron-star black-hole accretion disk Open
The simulation of heavy element nucleosynthesis requires input from yet-to-be-measured nuclear properties. The uncertainty in the values of these off-stability nuclear properties propagates to uncertainties in the predictions of elemental …
View article: Magnetic Field Strength Effects on Nucleosynthesis from Neutron Star Merger Outflows
Magnetic Field Strength Effects on Nucleosynthesis from Neutron Star Merger Outflows Open
Magnetohydrodynamic turbulence drives the central engine of post-merger remnants, potentially powering both a nucleosynthetically active disk wind and the relativistic jet behind a short gamma-ray burst. We explore the impact of the magnet…
View article: Neutrino fast flavor oscillations with moments: Linear stability analysis and application to neutron star mergers
Neutrino fast flavor oscillations with moments: Linear stability analysis and application to neutron star mergers Open
Providing an accurate modeling of neutrino physics in dense astrophysical environments such as binary neutron star mergers presents a challenge for hydrodynamic simulations. Nevertheless, understanding how flavor transformation can occur a…
View article: Two-moment Neutrino Flavor Transformation with Applications to the Fast Flavor Instability in Neutron Star Mergers
Two-moment Neutrino Flavor Transformation with Applications to the Fast Flavor Instability in Neutron Star Mergers Open
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 supernovae, neutron star mergers, and many other objects whe…
View article: Neutrino flavor transformation with moments: application to fast flavor instabilities in neutron star mergers
Neutrino flavor transformation with moments: application to fast flavor instabilities in neutron star mergers Open
Neutrino evolution, of great importance in environments such as neutron star mergers (NSM) because of their impact on explosive nucleosynthesis, is still poorly understood due to the high complexity and variety of possible flavor conversio…
View article: Emergent Nucleosynthesis from a 1.2 s Long Simulation of a Black Hole Accretion Disk
Emergent Nucleosynthesis from a 1.2 s Long Simulation of a Black Hole Accretion Disk Open
We simulate a black hole accretion disk system with full-transport general relativistic neutrino radiation magnetohydrodynamics for 1.2 s. This system is likely to form after the merger of two compact objects and is thought to be a robust …
View article: Emergent Nucleosynthesis from a 1.2 s Long Simulation of a Black Hole Accretion Disk
Emergent Nucleosynthesis from a 1.2 s Long Simulation of a Black Hole Accretion Disk Open
We simulate a black hole accretion disk system with full-transport general relativistic neutrino radiation magnetohydrodynamics for 1.2 s. This system is likely to form after the merger of two compact objects and is thought to be a robust …
View article: Thallium-208: A Beacon of <i>In Situ</i> Neutron Capture Nucleosynthesis
Thallium-208: A Beacon of <i>In Situ</i> Neutron Capture Nucleosynthesis Open
We demonstrate that the well-known 2.6 MeV gamma-ray emission line from thallium-208 could serve as a real-time indicator of astrophysical heavy element production, with both rapid (r) and intermediate (i) neutron capture processes capable…
View article: Could a Kilonova Kill: A Threat Assessment
Could a Kilonova Kill: A Threat Assessment Open
Binary neutron star mergers produce high-energy emissions from several physically different sources, including a gamma-ray burst (GRB) and its afterglow, a kilonova (KN), and, at late times, a remnant many parsecs in size. Ionizing radiati…
View article: Neutrino fast flavor oscillations with moments: linear stability analysis and application to neutron star mergers
Neutrino fast flavor oscillations with moments: linear stability analysis and application to neutron star mergers Open
Providing an accurate modeling of neutrino physics in dense astrophysical environments such as binary neutron star mergers presents a challenge for hydrodynamic simulations. Nevertheless, understanding how flavor transformation can occur a…
View article: Thallium-208: a beacon of in situ neutron capture nucleosynthesis
Thallium-208: a beacon of in situ neutron capture nucleosynthesis Open
We demonstrate that the well-known 2.6 MeV gamma-ray emission line from thallium-208 could serve as a real-time indicator of astrophysical heavy element production, with both rapid (r) and intermediate (i) neutron capture processes capable…
View article: Magnetic Field Strength Effects on Nucleosynthesis from Neutron Star Merger Outflows
Magnetic Field Strength Effects on Nucleosynthesis from Neutron Star Merger Outflows Open
Magnetohydrodynamic turbulence drives the central engine of post-merger remnants, potentially powering both a nucleosynthetically active disk wind and the relativistic jet behind a short gamma ray burst. We explore the impact of the magnet…
View article: Could a Kilonova Kill: a Threat Assessment
Could a Kilonova Kill: a Threat Assessment Open
Binary neutron star mergers (BNS) produce high-energy emissions from several physically different sources, including a gamma-ray burst (GRB) and its afterglow, a kilonova, and, at late times, a remnant many parsecs in size. Ionizing radiat…
View article: Emergent nucleosynthesis from a 1.2 second long simulation of a black-hole accretion disk
Emergent nucleosynthesis from a 1.2 second long simulation of a black-hole accretion disk Open
We simulate a black-hole accretion disk system with full-transport general relativistic neutrino radiation magnetohydrodynamics (GR$ν$RMHD) for 1.2 seconds. This system is likely to form after the merger of two compact objects and is thoug…
View article: Two-Moment Neutrino Flavor Transformation with applications to the Fast Flavor Instability in Neutron Star Mergers
Two-Moment Neutrino Flavor Transformation with applications to the Fast Flavor Instability in Neutron Star Mergers Open
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 supernovae, neutron star mergers, and many other objects whe…
View article: HD 222925: A New Opportunity to Explore the Astrophysical and Nuclear Conditions of r-process Sites
HD 222925: A New Opportunity to Explore the Astrophysical and Nuclear Conditions of r-process Sites Open
With the most trans-iron elements detected of any star outside the solar system, HD 222925 represents the most complete chemical inventory among metal-poor stars enhanced with elements made by the rapid neutron capture (“ r ”) process. As …