Kavli Affiliate: Philip J. Marshall | First 5 Authors: Tian Li, Thomas E. Collett, Philip J. Marshall, Sydney Erickson, Wolfgang Enzi | Summary: The time delay between multiple images of strongly lensed quasars has been used to infer the Hubble constant. The primary systematic uncertainty for time-delay cosmography is the mass-sheet transform (MST), which preserves […]
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 […]
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 […]
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 […]
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 […]
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 […]
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 […]
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 […]
Kavli Affiliate: Max Tegmark | First 5 Authors: Joshua Engels, Logan Riggs, Max Tegmark, , | Summary: Sparse autoencoders (SAEs) are a promising technique for decomposing language model activations into interpretable linear features. However, current SAEs fall short of completely explaining model performance, resulting in "dark matter": unexplained variance in activations. This work investigates dark […]
Kavli Affiliate: Nathan P. Lourie | First 5 Authors: Geoffrey Mo, Kishalay De, Eli Wiston, Nayana A. J., Raffaella Margutti | Summary: Type Ia supernovae arise from the thermonuclear explosions of white dwarfs in multiple star systems. A rare sub-class of SNe Ia exhibit signatures of interaction with circumstellar material (CSM), allowing for direct constraints […]