Astrophysics – Page 77 – Kavli Institute Pre-Print Publications

Domain-Adaptive Neural Posterior Estimation for Strong Gravitational Lens Analysis

Posted by dbos October 21, 2024November 4, 2024Chicago

Kavli Affiliate: Brian D. Nord | First 5 Authors: Paxson Swierc, Marcos Tamargo-Arizmendi, Aleksandra Ćiprijanović, Brian D. Nord, | Summary: Modeling strong gravitational lenses is prohibitively expensive for modern and next-generation cosmic survey data. Neural posterior estimation (NPE), a simulation-based inference (SBI) approach, has been studied as an avenue for efficient analysis of strong lensing […]

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Improving Parallel Program Performance with LLM Optimizers via Agent-System Interface

Posted by dbos October 21, 2024Peking

Kavli Affiliate: Ke Wang | First 5 Authors: Anjiang Wei, Allen Nie, Thiago S. F. X. Teixeira, Rohan Yadav, Wonchan Lee | Summary: Modern scientific discovery increasingly relies on high-performance computing for complex modeling and simulation. A key challenge in improving parallel program performance is efficiently mapping tasks to processors and data to memory, a […]

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Improving Parallel Program Performance with LLM Optimizers via Agent-System Interface

Posted by dbos October 21, 2024Peking

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A hybrid origin for the Martian atmosphere

Posted by dbos October 20, 2024Stanford

Kavli Affiliate: Laura Schaefer | First 5 Authors: Kaveh Pahlevan, Laura Schaefer, Don Porcelli, , | Summary: The Martian isotopic record displays a dichotomy in volatile compositions. Interior volatiles from the mantle record a chondritic heritage (e.g., H, N, Kr, Xe) whereas the atmospheric reservoir of Kr and Xe – which do not currently experience […]

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A hybrid origin for the Martian atmosphere

Posted by dbos October 20, 2024Stanford

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Early Bright Galaxies from Helium Enhancements in High-Redshift Star Clusters

Posted by October 18, 2024Chicago

Kavli Affiliate: Alexander P. Ji | First 5 Authors: Harley Katz, Alexander P. Ji, O. Grace Telford, Peter Senchyna, | Summary: The first few cycles of JWST have identified an overabundance of UV-bright galaxies and a general excess of UV luminosity density at $zgtrsim10$ compared to expectations from most (pre-JWST) theoretical models. Moreover, some of […]

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Early Bright Galaxies from Helium Enhancements in High-Redshift Star Clusters

Posted by October 18, 2024Chicago

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Early Bright Galaxies from Helium Enhancements in High-Redshift Star Clusters

Posted by October 18, 2024Chicago

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The disappearance of a massive star marking the birth of a black hole in M31

Posted by dbos October 18, 2024MIT

Kavli Affiliate: Erin Kara | First 5 Authors: Kishalay De, Morgan MacLeod, Jacob E. Jencson, Elizabeth Lovegrove, Andrea Antoni | Summary: Stellar mass black holes are formed from the terminal collapse of massive stars if the ensuing neutrino shock is unable to eject the stellar envelope. Direct observations of black hole formation remain inconclusive. We […]

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The abundance and nature of high-redshift quiescent galaxies from JADES spectroscopy and the FLAMINGO simulations

Posted by dbos October 18, 2024Cambridge

Kavli Affiliate: Roberto Maiolino | First 5 Authors: William M. Baker, Seunghwan Lim, Francesco D’Eugenio, Roberto Maiolino, Zhiyuan Ji | Summary: We use NIRSpec/MSA spectroscopy and NIRCam imaging to study a sample of 18 massive ($log; M_{*}/M_{odot} gt 10;$dex), central quiescent galaxies at $2leq z leq 5$ in the GOODS fields, to investigate their number […]

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