Kavli Affiliate: Risa H. Wechsler | First 5 Authors: Erin Kado-Fong, Erin Kado-Fong, , , | Summary: Recent efforts have extended our view of the number and properties of satellite galaxies beyond the Local Group firmly down to $rm M_starsim 10^6 M_odot$. A similarly complete view of the field dwarf population has lagged behind. Using […]
Kavli Affiliate: Risa H. Wechsler | First 5 Authors: Erin Kado-Fong, Erin Kado-Fong, , , | Summary: Recent efforts have extended our view of the number and properties of satellite galaxies beyond the Local Group firmly down to $rm M_starsim 10^6 M_odot$. A similarly complete view of the field dwarf population has lagged behind. Using […]
Kavli Affiliate: Risa H. Wechsler | First 5 Authors: Helena Treiber, Helena Treiber, , , | Summary: We present the most precise and lowest-mass weak lensing measurements of dwarf galaxies to date, enabled by spectroscopic lenses from the Dark Energy Spectroscopic Instrument (DESI) and photometric lenses from the Dark Energy Survey (DES) calibrated with DESI […]
Kavli Affiliate: Risa H. Wechsler | First 5 Authors: Helena Treiber, Helena Treiber, , , | Summary: We present the most precise and lowest-mass weak lensing measurements of dwarf galaxies to date, enabled by spectroscopic lenses from the Dark Energy Spectroscopic Instrument (DESI) and photometric lenses from the Dark Energy Survey (DES) calibrated with DESI […]
Kavli Affiliate: Zhuo Li | First 5 Authors: Huizhen Shu, Huizhen Shu, , , | Summary: Achieving robust safety alignment in large language models (LLMs) while preserving their utility remains a fundamental challenge. Existing approaches often struggle to balance comprehensive safety with fine-grained controllability at the representation level. We introduce LATENTGUARD, a novel three-stage framework […]
Kavli Affiliate: Gregory J. Herczeg | First 5 Authors: Min Fang, Min Fang, , , | Summary: We re-evaluate the star formation history of the nearby Sco-Cen OB Association with a comprehensive analysis of Gaia XP spectra of more than 7,800 potential members. New spectral classifications are obtained by fitting individual XP spectra with templates […]
Kavli Affiliate: Kiyoshi W. Masui | First 5 Authors: Calvin Leung, Calvin Leung, , , | Summary: Baryonic feedback is a leading contaminant in studying dark matter and cosmology using cosmic shear. This has meant omitting much of the data during cosmological inference, or forward-modeling the spatial distribution of gas around dark matter halos using […]
Kavli Affiliate: Gordan Krnjaic | First 5 Authors: Gordan Krnjaic, Gordan Krnjaic, , , | Summary: We study inelastic dark matter produced via freeze-in through a light mediator with a mass splitting below the electron-positron threshold. In this regime, the heavier dark matter state is naturally long-lived compared to the age of the Universe and […]
Kavli Affiliate: Kohei Inayoshi | First 5 Authors: Kohei Inayoshi, Kohei Inayoshi, , , | Summary: The birth of seeds of massive black holes (BHs) and nascent galaxies at cosmic dawn takes place in dense gaseous environments, which play a crucial role in shaping their coevolution and radiation spectra. We investigate gas accretion during the […]
Kavli Affiliate: Mark Vogelsberger | First 5 Authors: Xuejian Shen, Xuejian Shen, , , | Summary: Early JWST observations have revealed a high-redshift universe more vibrant than predicted by canonical galaxy-formation models within $Lambda$CDM, showing an excess of ultraviolet(UV)-bright, massive, and morphologically mature galaxies. Departures from $Lambda$CDM prior to recombination can imprint signatures on non-linear […]