Astrophysics – Kavli Institute Pre-Print Publications

The Stochastic Siren: Astrophysical Gravitational-Wave Background Measurements of the Hubble Constant

Posted by dbos March 3, 2025March 5, 2025Chicago, This Week: Astrophysics

Kavli Affiliate: Daniel E. Holz | First 5 Authors: Bryce Cousins, Kristen Schumacher, Adrian Ka-Wai Chung, Colm Talbot, Thomas Callister | Summary: Gravitational waves from individually resolved compact object mergers can be used as standard sirens, offering a novel self-calibrating precision probe of cosmology. While the standard siren method has been well-explored, the gravitational-wave background […]

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Mapping the merging zone of late infall in the AB Aur planet-forming system

Posted by dbos March 3, 2025March 5, 2025Peking, This Week: Astrophysics

Kavli Affiliate: Ruobing Dong | First 5 Authors: Jessica Speedie, Ruobing Dong, Richard Teague, Dominique Segura-Cox, Jaime E. Pineda | Summary: Late infall events challenge the traditional view that planet formation occurs without external influence. Here we present deep ALMA $^{12}$CO $J=2-1$ and SO $J_{N}=5_6-4_5$ observations toward AB Aurigae, a Class II disk system with […]

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Aeos: The Impact of Pop III Initial Mass Function and Star-by-Star Models in Galaxy Simulations

Posted by dbos February 27, 2025March 5, 2025Chicago, This Week: Astrophysics

Kavli Affiliate: Alexander P. Ji | First 5 Authors: Kaley Brauer, Jennifer Mead, John H. Wise, Greg L. Bryan, Mordecai-Mark Mac Low | Summary: We explore the effect of variations in the Population III (Pop III) initial mass function (IMF) and star-by-star feedback on early galaxy formation and evolution using the Aeos simulations. We compare […]

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Spectroastrometry and Reverberation Mapping of Active Galactic Nuclei. II. Measuring Geometric Distances and Black Hole Masses of Four Nearby Quasars

Posted by dbos February 26, 2025March 5, 2025Peking, This Week: Astrophysics

Kavli Affiliate: Jinyi Shangguan | First 5 Authors: Yan-Rong Li, Jinyi Shangguan, Jian-Min Wang, Ric Davies, Daryl J. Santos | Summary: The geometric distances of active galactic nuclei (AGNs) are challenging to measure because of their exceptionally compact structure yet vast cosmic distances. A combination of spectroastrometry and reverberation mapping (SARM) of broad-line regions (BLRs) […]

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FEASTS Combined with Interferometry (IV): Mapping HI Emission to a limit of $N_{text{HI}}=10^{17.7} text{cm}^{-2}$ in Seven Edge-on Galaxies

Posted by dbos February 24, 2025March 5, 2025Peking, This Week: Astrophysics

Dong Yang, Jing Wang, Zhijie Qu, Zezhong Liang, Xuchen Lin | Summary: [[{“value”:”We present a statistical study of the neutral atomic hydrogen (HI) gas extending into the circumgalactic medium perpendicular to the disk for 7 edge-on galaxies with inclinations above $85^{circ}$ from the FEASTS program with a $3sigma$ ($20,text{km},text{s}^{-1}$) column density ($N_{text{HI}}$) depth of $5times10^{17} […]

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The GammaTPC Gamma-Ray Telescope Concept

Posted by dbos February 20, 2025March 5, 2025Stanford

Kavli Affiliate: Eric Charles | First 5 Authors: Tom Shutt, Bahrudin Trbalic, Eric Charles, Niccolo Di Lalla, Oliver Hitchcock | Summary: We present GammaTPC, a transformative 0.1-10 MeV $gamma$-ray instrument concept featuring a tracker using a liquid argon time projection chamber (LAr TPC) technology with the novel GAMPix high spatial resolution and ultra low power […]

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Disturbed cold gas in galaxy and structure formation

Posted by February 20, 2025Peking

Siwei Zou, Robert A. Simcoe, Patrick Petitjean, Celine Peroux, Jaclyn B. Champagne | Summary: [[{“value”:”Cold and cool gas (T $leq 10^4$ K) in the circumgalactic medium (CGM) and its interaction with galaxies remain poorly understood. Simulations predict that cold gas flows into galaxies through cosmic filaments, determining the disk formation and galaxy evolution. The cold […]

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Disturbed cold gas in galaxy and structure formation

Posted by February 20, 2025Peking

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RelaCtrl: Relevance-Guided Efficient Control for Diffusion Transformers

Posted by dbos February 20, 2025March 5, 2025Peking

Kavli Affiliate: Jing Wang | First 5 Authors: Ke Cao, Jing Wang, Ao Ma, Jiasong Feng, Zhanjie Zhang | Summary: The Diffusion Transformer plays a pivotal role in advancing text-to-image and text-to-video generation, owing primarily to its inherent scalability. However, existing controlled diffusion transformer methods incur significant parameter and computational overheads and suffer from inefficient […]

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One-loop Renormalization of BPS String Masses in Pseudo-anomalous Heterotic String

Posted by dbos February 19, 2025March 5, 2025Chicago

Kavli Affiliate: Jeffrey A. Harvey | First 5 Authors: Jeffrey A. Harvey, Tai Wai Hu, , , | Summary: Compactification of heterotic string on a Calabi-Yau threefold can lead to a four-dimensional low-energy effective theory which contains a $U(1)$ gauge theory which is pseudo-anomalous, meaning that the fermion content is anomalous, but that the fermion […]

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