The Kratos Framework for Heterogeneous Astrophysical Simulations: Ray Tracing, Reacting Flow and Thermochemistry

Posted by dbos Peking

Kavli Affiliate: Lile Wang | First 5 Authors: Lile Wang, , , , | Summary: Thermochemistry, ray-tracing radiation, and radiation-matter interactions are important processes which are computationally difficult to model in astrophysical simulations, addressed by introducing novel algorithms optimized for heterogeneous architectures in the Kratos framework. Key innovations include a stoichiometry-compatible reconstruction scheme for consistent […]


Continue.. The Kratos Framework for Heterogeneous Astrophysical Simulations: Ray Tracing, Reacting Flow and Thermochemistry

The Kratos Framework for Heterogeneous Astrophysical Simulations: Ray Tracing, Reacting Flow and Thermochemistry

Posted by dbos Peking

Kavli Affiliate: Lile Wang | First 5 Authors: Lile Wang, , , , | Summary: Thermochemistry, ray-tracing radiation, and radiation-matter interactions are important processes which are computationally difficult to model in astrophysical simulations, addressed by introducing novel algorithms optimized for heterogeneous architectures in the Kratos framework. Key innovations include a stoichiometry-compatible reconstruction scheme for consistent […]


Continue.. The Kratos Framework for Heterogeneous Astrophysical Simulations: Ray Tracing, Reacting Flow and Thermochemistry

Novel Polarimetric Analysis of Near Horizon Flaring Episodes in M87* in Millimeter Wavelength

Posted by dbos MIT

Kavli Affiliate: Mark Vogelsberger | First 5 Authors: Razieh Emami, Matthew Liska, Koushik Chatterjee, Geoffrey C. Bower, Wystan Benbow | Summary: Recent multi-wavelength observations of M87* citep{2024A&A…692A.140A} revealed a high-energy $gamma$-ray flare without a corresponding millimeter counterpart. We present a theoretical polarimetric study to evaluate the presence and nature of a potential millimeter flare in […]


Continue.. Novel Polarimetric Analysis of Near Horizon Flaring Episodes in M87* in Millimeter Wavelength

The DECam MAGIC Survey: A Wide-field Photometric Metallicity Study of the Sculptor Dwarf Spheroidal Galaxy

Posted by klaurent Chicago

Kavli Affiliate: Alexander Ji | First 5 Authors: Fabrícia O. Barbosa, Anirudh Chiti, Guilherme Limberg, Andrew Pace, William Cerny | Summary: The metallicity distribution function and internal chemical variations of a galaxy are fundamental to understand its formation and assembly history. In this work, we analyze photometric metallicities for 3883 stars over seven half-light radii […]


Continue.. The DECam MAGIC Survey: A Wide-field Photometric Metallicity Study of the Sculptor Dwarf Spheroidal Galaxy

JADES: comprehensive census of broad-line AGN from Reionization to Cosmic Noon revealed by JWST

Posted by klaurent Cambridge

Kavli Affiliate: Roberto Maiolino | First 5 Authors: Ignas Juodžbalis, Roberto Maiolino, William M. Baker, Emma Curtis Lake, Jan Scholtz | Summary: The depth and coverage of the first years of JWST observations have revealed low luminosity active galactic nuclei (AGN) across a wide redshift range, shedding light on black hole (BH) assembly and feedback. […]


Continue.. JADES: comprehensive census of broad-line AGN from Reionization to Cosmic Noon revealed by JWST

JADES: comprehensive census of broad-line AGN from Reionization to Cosmic Noon revealed by JWST

Posted by dbos Cambridge

Kavli Affiliate: Roberto Maiolino | First 5 Authors: Ignas Juodžbalis, Roberto Maiolino, William M. Baker, Emma Curtis Lake, Jan Scholtz | Summary: The depth and coverage of the first years of JWST observations have revealed low luminosity active galactic nuclei (AGN) across a wide redshift range, shedding light on black hole (BH) assembly and feedback. […]


Continue.. JADES: comprehensive census of broad-line AGN from Reionization to Cosmic Noon revealed by JWST

Recursive Training Loops in LLMs: How training data properties modulate distribution shift in generated data?

Posted by dbos MIT

Kavli Affiliate: Peter Ford | First 5 Authors: Grgur Kovač, Jérémy Perez, Rémy Portelas, Peter Ford Dominey, Pierre-Yves Oudeyer | Summary: Large language models (LLMs) are increasingly contributing to the creation of content on the Internet. This creates a feedback loop as subsequent generations of models will be trained on this generated, synthetic data. This […]


Continue.. Recursive Training Loops in LLMs: How training data properties modulate distribution shift in generated data?

Evidence for Charge Exchange Emission in Supernova Remnant N132D from XRISM/Resolve Observations

Posted by klaurent MIT

Kavli Affiliate: Eric D. Miller | First 5 Authors: Liyi Gu, Hiroya Yamaguchi, Adam Foster, Satoru Katsuda, Hiroyuki Uchida | Summary: XRISM has delivered one of its first light observations on N132D, the X-ray brightest supernova remnant in the Large Magellanic Cloud. Utilizing 193 ks of high-resolution X-ray spectroscopy data, we conduct a comprehensive search […]


Continue.. Evidence for Charge Exchange Emission in Supernova Remnant N132D from XRISM/Resolve Observations

Ain’t no resonance high enough: Core collapse in self-interacting dark matter across two decades in halo mass

Posted by klaurent MIT

Kavli Affiliate: Mark Vogelsberger | First 5 Authors: Vinh Tran, Xuejian Shen, Daniel Gilman, Mark Vogelsberger, Stephanie O’Neil | Summary: Core collapse, a process associated with self-interacting dark matter (SIDM) models, can increase the central density of halos by orders of magnitude with observable consequences for dwarf galaxy properties and gravitational lensing. Resonances in the […]


Continue.. Ain’t no resonance high enough: Core collapse in self-interacting dark matter across two decades in halo mass

Supersizing hydrodynamical simulations of reionization using perturbative techniques

Posted by klaurent MIT

Kavli Affiliate: Mark Vogelsberger | First 5 Authors: Wenzer Qin, Katelin Schutz, Olivia Rosenstein, Stephanie O’Neil, Mark Vogelsberger | Summary: We show that perturbative techniques inspired by effective field theory (EFT) can be used to "paint on" the 21~cm field during reionization using only the underlying linear density field. This procedure is accurate to within […]


Continue.. Supersizing hydrodynamical simulations of reionization using perturbative techniques