Výsledky vyhledávání - "Clark, Alexander"

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The Challenges of Modeling Astrophysical Reacting Flows

Autor: Zingale, Michael, Bhargava, Khanak, Brady, Ryan, Chen, Zhi, Guichandut, Simon, Johnson, Eric T., Katz, Max, Clark, Alexander Smith

Stellar evolution is driven by the changing composition of a star from nuclear reactions. At the late stages of evolution and during explosive events, the timescale can be short and drive strong hydrodynamic flows, making simulations of astrophysical

Externí odkaz: http://arxiv.org/abs/2411.12491

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Classification and nonexistence results for tensor $t$-structures on derived categories of schemes

Autor: Biswas, Rudradip, Clark, Alexander, Lank, Pat, Rahul, Kabeer Manali, Parker, Chris J.

Our work examines $t$-structures in derived categories related to Noetherian schemes, establishing both classification and nonexistence results for compactly generated $t$-structures that satisfy a tensor compatibility condition. First, we classify w

Externí odkaz: http://arxiv.org/abs/2404.08578

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Strong Coupling of Hydrodynamics and Reactions in Nuclear Statistical Equilibrium for Modeling Convection in Massive Stars

Autor: Zingale, Michael, Chen, Zhi, Johnson, Eric T., Katz, Max P., Clark, Alexander Smith

We build on the simplified spectral deferred corrections (SDC) coupling of hydrodynamics and reactions to handle the case of nuclear statistical equilibrium (NSE) and electron/positron captures/decays in the cores of massive stars. Our approach blend

Externí odkaz: http://arxiv.org/abs/2403.14786

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A Framework for Exploring Nuclear Physics Sensitivity in Numerical Simulations

Autor: Chen, Zhi, Johnson, Eric T., Katz, Max, Clark, Alexander Smith, Boyd, Brendan, Zingale, Michael

We describe the AMReX-Astrophysics framework for exploring the sensitivity of astrophysical simulations to the details of a nuclear reaction network, including the number of nuclei, choice of reaction rates, and approximations used. This is explored

Externí odkaz: http://arxiv.org/abs/2312.02836

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Sensitivity of 3D Convective Urca Simulations to Changes in Urca Reactions

Autor: Boyd, Brendan, Clark, Alexander Smith, Calder, Alan C., Townsley, Dean M., Zingale, Michael

Publikováno v: J. Phys.: Conf. Ser. 2742 (2024)

A proposed setting for thermonuclear (Type Ia) supernovae is a white dwarf that has gained mass from a companion to the point of carbon ignition in the core. There is a simmering phase in the early stages of burning that involves the formation and gr

Externí odkaz: http://arxiv.org/abs/2311.07743

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Sensitivity of Simulations of Double Detonation Type Ia Supernova to Integration Methodology

Autor: Zingale, Michael, Chen, Zhi, Rasmussen, Melissa, Polin, Abigail, Katz, Max, Clark, Alexander Smith, Johnson, Eric T.

We study the coupling of hydrodynamics and reactions in simulations of the double detonation model for Type Ia supernovae. When assessing the convergence of simulations, the focus is usually on spatial resolution; however, the method of coupling the

Externí odkaz: http://arxiv.org/abs/2309.01802

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Akademický článek

Shellfishing, sea levels, and the earliest Native American villages (5000–3800 yrs. BP) of the South Atlantic Coast of the U.S

Autor: Victor D. Thompson, Matthew Sanger, Karen Y. Smith, Carey J. Garland, Matthew D. Howland, C. Fred T. Andrus, Isabelle Holland-Lulewicz, Carla Hadden, Clark Alexander, Rachel Cajigas, Elliot Blair, Anna Semon, David Hurst Thomas

Publikováno v: Scientific Reports, Vol 14, Iss 1, Pp 1-9 (2024)

Abstract Shell ring archaeological sites are one of the most visible site types along the lower South Atlantic Coast of the United States. These cultural sites are large, circular to arcuate piles of mollusk shells with some reaching over three meter

Externí odkaz: https://doaj.org/article/fe7a12ec68f64696854f493af020c764