Influence Functional Approach to Non-Perturbative Exciton Binding Renormalization from Phonons

Posted by klaurent Berkeley

Kavli Affiliate: Jeffrey Neaton | Summary:We construct a many-body model Hamiltonian to capture how phonons renormalize exciton binding as a function of temperature. By using the GW approximation and density functional perturbation theory, we are able to parameterize this Hamiltonian completely from first principles. To capture static quasiparticle properties non-perturbatively, we evolve this Hamiltonian in […]


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Dimpled scalar vortex coronagraph laboratory demonstration

Posted by klaurent Caltech

Kavli Affiliate: Dimitri Mawet| Summary:Achieving the Habitable Worlds Observatory (HWO) goal of 10^-10 contrast at a separation of 3 $λ$/D across a 20% bandwidth requires coronagraph focal plane masks with both broadband high contrast performance and high planet throughput. Scalar vortex coronagraphs (SVCs) offer a promising alternative to polarization-sensitive vector vortex designs but face chromatic […]


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The Crimson Kiss of Two Giants: Helium Detonation and High-Energy Neutrino Production

Posted by klaurent Peking

Kavli Affiliate: Pau Amaro Seoane | Summary:The coalescence of degenerate helium cores during red giant collisions – a process we term erythrohenosis – introduces a novel class of transient astrophysical sources of high-energy neutrinos. Using stellar models generated with MESA and SPH simulations of the final inspiral phase, we develop a semi-analytical model to estimate […]


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Second Order Closures for the Radiative Transfer Equation: Some Are Unstable

Posted by klaurent Chicago

Kavli Affiliate: Nickolay Gnedin | Summary:The largest existing simulations of cosmic reionization model radiative transfer with moment methods that require a closure relation. The two most commonly used closure relations are M1 and OTVET; both close the moment hierarchy at the first moment. We explore the properties of a higher, second-order closure. We show that […]


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QLP Data Release Notes 004: TESS-Gaia Light Curve Photometry Implementation

Posted by klaurent MIT

Kavli Affiliate: George Ricker | Summary:The Quick-Look Pipeline (QLP; Huang et al. 2020, Kunimoto et al. 2021 and references therein) generates light curves for up to 2 million stars every 27.4 days observed by TESS as part of its planet search. As machine learning methods enable deeper searches and scientific priorities shift toward fainter stars, […]


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Leveraging AI-powered interactive playbacks to decipher rules of communication in zebra finches

Posted by dbos Columbia

Kavli Affiliate: Sarah Woolley | Authors: Logan S James, Benjamin Hoffman, Jen-Yu Liu, Marius Miron, Milad Alizadeh, Emmanuel Fernandez, Matthieu Geist, Diane Kim, Aza Raskin, Jon T Sakata, Emmanuel Chemla, Olivier Pietquin and Sarah C Woolley | Summary: Vocal interactions are fundamental for social functioning across animals, including humans. The diverse rules underlying these exchanges […]


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The SPHEREx Ices Investigation: An Overview

Posted by klaurent Caltech

Kavli Affiliate: James Bock | Summary:SPHEREx is a NASA mission designed to perform an all-sky spectroscopic survey in the 0.75 – 5 $μ$m wavelength range. Its primary science objectives are to investigate: (1) inflationary cosmology, (2) the history of galaxy formation, and (3) the abundance of molecular ices – critical for prebiotic chemistry – found […]


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Highly-efficient perturbative Raman shifting by engineering the nonlinear temporal response

Posted by klaurent Cornell

Kavli Affiliate: Frank Wise | Summary:Raman scattering underlies a broad range of spectroscopic and light-generation techniques, yet its conventional description, based on the Raman gain spectrum, accurately describes only long-pulse, steady-state dynamics. We present a time-domain theoretical approach that provides a unified and physically-transparent description of Raman interactions across all temporal regimes. It enables direct […]


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Temporal analysis and control of Raman scattering dynamics

Posted by klaurent Cornell

Kavli Affiliate: Frank Wise | Summary:Raman scattering underlies a broad range of spectroscopic and light-generation techniques, yet its conventional description, based on the Raman gain spectrum, accurately describes only long-pulse, steady-state dynamics. We present and develop a time-domain theoretical approach that provides a unified and physically-transparent description of Raman interactions across all temporal regimes. It […]


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Tracing Star Formation in Quasar Hosts via [O II] $λ$3727: A Kinematically Consistent Approach

Posted by klaurent Peking

Kavli Affiliate: Luis Ho | Summary:Measuring star formation in quasar host galaxies is crucial for understanding the coevolution of supermassive black holes (SMBHs) and galaxies, yet remains observationally challenging due to severe contamination from active galactic nucleus (AGN) emission. In this work, we present a new method to robustly isolate the AGN contribution to the […]


Continue.. Tracing Star Formation in Quasar Hosts via [O II] $λ$3727: A Kinematically Consistent Approach