James P. Kneller
YOU?
Author Swipe
View article: Turbulence in Core-collapse Supernovae
Turbulence in Core-collapse Supernovae Open
It is understood in a general sense that turbulent fluid motion below the shock front in a core-collapse supernova stiffens the effective equation of state of the fluid and aids in the revival of the explosion. However, when one wishes to …
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: Data-driven core collapse supernova multilateration with first neutrino events
Data-driven core collapse supernova multilateration with first neutrino events Open
A Galactic core-collapse supernova (CCSN) is likely to be observed in neutrino detectors around the world minutes to hours before the electromagnetic radiation arrives. The SNEWS2.0 network of neutrino and dark matter detectors aims to use…
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: The SNEWS 2.0 alert software for the coincident detection of neutrinos from core-collapse supernovae
The SNEWS 2.0 alert software for the coincident detection of neutrinos from core-collapse supernovae Open
The neutrino signal from the next galactic core-collapse supernova will provide an invaluable early warning of the explosion. By combining the burst trigger from several neutrino detectors, the location of the explosion can be triangulated…
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: 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: 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: Fundamental Symmetries, Neutrons, and Neutrinos (FSNN): Whitepaper for the 2023 NSAC Long Range Plan
Fundamental Symmetries, Neutrons, and Neutrinos (FSNN): Whitepaper for the 2023 NSAC Long Range Plan Open
Through the exploration of fundamental symmetries, and by using nuclei, neutrons, and neutrinos, nuclear physics addresses some of the most profound questions in science. Why does the universe contain so much more matter than antimatter? A…
View article: Collaborative experience between scientific software projects using Agile Scrum development
Collaborative experience between scientific software projects using Agile Scrum development Open
Developing sustainable software for the scientific community requires expertise in software engineering and domain science. This can be challenging due to the unique needs of scientific software, the insufficient resources for software eng…
View article: Neutrino Fast Flavor Instability in three dimensions for a Neutron Star Merger
Neutrino Fast Flavor Instability in three dimensions for a Neutron Star Merger Open
The flavor evolution of neutrinos in core collapse supernovae and neutron star mergers is a critically important unsolved problem in astrophysics. Following the electron flavor evolution of the neutrino system is essential for calculating …
View article: Neutrino flavor mixing with moments
Neutrino flavor mixing with moments Open
The successful transition from core-collapse supernova simulations using classical neutrino transport to simulations using quantum neutrino transport will require the development of methods for calculating neutrino flavor transformations t…
View article: Advancing the Landscape of Multimessenger Science in the Next Decade
Advancing the Landscape of Multimessenger Science in the Next Decade Open
The last decade has brought about a profound transformation in multimessenger science. Ten years ago, facilities had been built or were under construction that would eventually discover the nature of objects in our universe could be detect…
View article: Advancing the Landscape of Multimessenger Science in the Next Decade
Advancing the Landscape of Multimessenger Science in the Next Decade Open
The last decade has brought about a profound transformation in multimessenger science. Ten years ago, facilities had been built or were under construction that would eventually discover the nature of objects in our universe could be detect…
View article: SNEWPY: A Data Pipeline from Supernova Simulations to Neutrino Signals
SNEWPY: A Data Pipeline from Supernova Simulations to Neutrino Signals Open
Current neutrino detectors will observe hundreds to thousands of neutrinos from Galactic supernovae, and future detectors will increase this yield by an order of magnitude or more. With such a data set comes the potential for a huge increa…
View article: SNEWPY: A Data Pipeline from Supernova Simulations to Neutrino Signals
SNEWPY: A Data Pipeline from Supernova Simulations to Neutrino Signals Open
Current neutrino detectors will observe hundreds to thousands of neutrinos from a Galactic supernovae, and future detectors will increase this yield by an order of magnitude or more. With such a data set comes the potential for a huge incr…
View article: Neutrino flavor mixing with moments
Neutrino flavor mixing with moments Open
The successful transition from core-collapse supernova simulations using classical neutrino transport to simulations using quantum neutrino transport will require the development of methods for calculating neutrino flavor transformations t…
View article: SNEWS 2.0: a next-generation supernova early warning system for multi-messenger astronomy
SNEWS 2.0: a next-generation supernova early warning system for multi-messenger astronomy Open
Parallel Contributed Talk at the\n"XIX International Workshop on Neutrino Telescopes"\non line - 18-26 February, 2021
View article: Coupling neutrino oscillations and simulations of core-collapse supernovae
Coupling neutrino oscillations and simulations of core-collapse supernovae Open
At the present time even the most sophisticated, multi-dimensional simulations of core-collapse supernovae do not (self-consistently) include neutrino flavor transformation. This physics is missing despite the importance of neutrinos in th…
View article: Neutrino flavor transformation in supernova as a probe for nonstandard neutrino-scalar interactions
Neutrino flavor transformation in supernova as a probe for nonstandard neutrino-scalar interactions Open
We consider a nonstandard interaction between the neutrino and a hypothetical massive scalar or pseudoscalar. In the ultrarelativistic limit, the new effective interaction between the neutrinos vanishes if neutrinos are Dirac fermions but …
View article: Neutrino quantum kinetics in compact objects
Neutrino quantum kinetics in compact objects Open
Neutrinos play a critical role of transporting energy and changing the lepton density within corecollapse supernovae and neutron star mergers. The quantum kinetic equations (QKEs) combine the effects of neutrino-matter interactions treated…
View article: Neutrino Quantum Kinetics in Compact Objects
Neutrino Quantum Kinetics in Compact Objects Open
This contains the codebase and data from "Neutrino Quantum Kinetics in Compact Objects" by Sherwood Richers, Gail McLaughlin, Alexey Vlasenko, and James P. Kneller. (2019, submitted to PrD) ====================== All f.h5 file contents ===…
View article: Neutrino Quantum Kinetics in Compact Objects
Neutrino Quantum Kinetics in Compact Objects Open
This contains the codebase and data from "Neutrino Quantum Kinetics in Compact Objects" by Sherwood Richers, Gail McLaughlin, Alexey Vlasenko, and James P. Kneller. (2019, submitted to PRD) ====================== All f.h5 file contents ===…
View article: Neutrino Quantum Kinetics in Compact Objects
Neutrino Quantum Kinetics in Compact Objects Open
This contains the codebase and data from "Neutrino Quantum Kinetics in Compact Objects" by Sherwood Richers, Gail McLaughlin, Alexey Vlasenko, and James P. Kneller. (2019, submitted to PrD) ====================== All f.h5 file contents ===…