Astrophysics – Page 4 – Kavli Institute Pre-Print Publications

Interpreting the High-Recoil LUX-ZEPLIN Event with Bino-/Singlino-like and Higgsino Dark Matter

Posted by klaurent September 30, 2026October 12, 2026Chicago

Kavli Affiliate: Carlos Wagner | Summary:The LUX-ZEPLIN (LZ) experiment has recently reported a nuclear-recoil candidate at $E_Rsimeq248$ keV. We study two supersymmetric interpretations based on distinct neutralino couplings to the $Z$ boson. In the elastic case, a bino- or singlino-like neutralino scatters through a diagonal axial $Z$ coupling set by the Higgsino asymmetry $X=|N_13|^2-|N_14|^2$ rather […]

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Improved Constraints on Cosmic Microwave Background Circular Polarization with CLASS

Posted by klaurent September 30, 2026October 12, 2026Chicago

Kavli Affiliate: Jeffrey McMahon | Summary:We present improved constraints on circular polarization in the cosmic microwave background (CMB) from the Cosmology Large Angular Scale Surveyor (CLASS) experiment using data at 90, 150, and 220 GHz to complement previous results based on 40 GHz data alone. We extend constraints on circular polarization from the atmosphere to […]

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When Streams Curve Away: a Test of Dark Matter from Extragalactic Stellar Stream Populations

Posted by klaurent September 30, 2026October 12, 2026MIT

Kavli Affiliate: Lina Necib | Summary:The nature of dark matter sets the shape of galactic halos: collisionless cold dark matter (CDM) predicts triaxial halos, while scattering in self-interacting dark matter (SIDM) rounds them toward sphericity. We show that a large catalog of projected stellar stream tracks can statistically constrain halo shapes, and therefore the particle […]

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TripleFlow: Training-Free Video Object Removal by Bridging Residual Editing and Native Generation

Posted by klaurent September 30, 2026October 12, 2026Chicago

Kavli Affiliate: David W. Miller | Summary:Video object removal presents a uniquely difficult editing challenge. Because a removal prompt specifies only what to erase rather than what to generate, the model must infer and reconstruct a highly specific occluded background entirely from the surrounding context. Existing training-free methods struggle with this because their editing mechanisms […]

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TripleFlow: Training-Free Video Object Removal by Bridging Residual Editing and Native Generation

Posted by klaurent September 30, 2026October 12, 2026Chicago

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The Simons Observatory: Design and Initial Performance of the Detector Readout System for the Large-Aperture Telescope

Posted by klaurent September 30, 2026October 12, 2026Stanford

Kavli Affiliate: Zeeshan Ahmed | Summary:We present the design, implementation, and initial performance of a highly multiplexed cryogenic superconducting detector readout system in the context of its deployment to the Simons Observatory large-aperture telescope (LAT). The Simons Observatory is a cosmic microwave background experiment located at 5,200 m in Chile’s Atacama Desert. In addition to […]

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Pulsar glitches triggered by quakes when stress reaches a threshold

Posted by klaurent September 30, 2026October 12, 2026Peking

Kavli Affiliate: Renxin Xu | Summary:The starquake model of pulsar glitches is revisited in light of accumulated observational data. A statistical comparison between the time-predictable and the magnitude-predictable models, borrowed from seismology and grounded in the classical spring-slider framework, is performed against a sample of 245 glitch events from 9 pulsars. It is found that […]

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Migration and Evolution of giant ExoPlanets (MEEP). III. Twenty-Nine Giant Planets from the TESS Mission

Posted by klaurent September 29, 2026October 12, 2026MIT

Kavli Affiliate: Avi Shporer | Summary:We present the discovery and characterization of 29 hot and warm Jupiter systems transiting bright ($G < 12.8$) FGK stars using TESS data and ground-based photometry and spectroscopy. Through the use of high angular resolution imaging, we discovered three bound stellar companions, named TOI-3988 B, TOI-6171 B, and TOI-7266 B. […]

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VLBI Astrometric Procedure and Performance with CHIME/FRB Outriggers

Posted by klaurent September 29, 2026October 12, 2026MIT

Kavli Affiliate: Kiyoshi Masui | Summary:Precise localizations of fast radio bursts (FRBs) to specific environments within their host galaxies with very-long-baseline interferometry (VLBI) have provided valuable insights into the nature of their progenitors. To date, such localizations have relied primarily on traditional VLBI facilities, whose observational capabilities limit them to targeted follow-up on a small […]

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Two-sample tests for principal eigenvalues and eigenvectors in high-dimensional elliptical factor models

Posted by klaurent September 29, 2026October 12, 2026Peking

Kavli Affiliate: Feng Long| Summary: Changes in principal eigenvalues and eigendirections provide complementary diagnostics of structural instability in factor models, but covariance-based inference can be unreliable under heavy tails. We develop two-sample tests for equality of these features of trace-normalized shape matrices under high-dimensional elliptical factor models. Our approach combines Tyler’s identity with orthogonalization and […]

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