Astrophysics – Page 468 – Kavli Institute Pre-Print Publications

Concordance between observations and simulations in the evolution of the mass relation between supermassive black holes and their host galaxies

Posted by klaurent May 9, 2022May 24, 2022Tokyo

Kavli Affiliate: John D. Silverman | First 5 Authors: Xuheng Ding, John D. Silverman, Tommaso Treu, Junyao Li, Aklant K. Bhowmick | Summary: We carry out a comparative analysis of the relation between the mass of supermassive black holes (BHs) and the stellar mass of their host galaxies at $0.2<z<1.7$ using well-matched observations and multiple […]

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Concordance between observations and simulations in the evolution of the mass relation between supermassive black holes and their host galaxies

Posted by klaurent May 9, 2022Tokyo

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Insights into the origin of halo mass profiles from machine learning

Posted by klaurent May 9, 2022Stanford

Kavli Affiliate: Risa H. Wechsler | First 5 Authors: Luisa Lucie-Smith, Susmita Adhikari, Risa H. Wechsler, , | Summary: The mass distribution of dark matter haloes is the result of the hierarchical growth of initial density perturbations through mass accretion and mergers. We use an interpretable machine-learning framework to provide physical insights into the origin […]

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A neural network model for timing control with reinforcement

Posted by klaurent May 9, 2022Peking

Kavli Affiliate: Jing Wang | First 5 Authors: Jing Wang, Yousuf El-Jayyousi, Ilker Ozden, , | Summary: How do humans and animals perform trial-and-error learning when the space of possibilities is infinite? In a previous study, we used an interval timing production task and discovered an updating strategy in which the agent adjusted the behavioral […]

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On the faintest solar coronal hard X-rays observed with FOXSI

Posted by klaurent May 9, 2022May 17, 2022Tokyo

Kavli Affiliate: Tadayuki Takahashi | First 5 Authors: Juan Camilo Buitrago-Casas, Lindsay Glesener, Steven Christe, Säm Krucker, Juliana Vievering | Summary: Solar nanoflares are small eruptive events releasing magnetic energy in the quiet corona. If nanoflares follow the same physics as their larger counterparts, they should emit hard X-rays (HXRs) but with a rather faint […]

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The R-Process Alliance: A Nearly Complete R-Process Abundance Template Derived from Ultraviolet Spectroscopy of the R-Process-Enhanced Metal-Poor Star HD 222925

Posted by klaurent May 6, 2022May 17, 2022MIT

Kavli Affiliate: Anna Frebel | First 5 Authors: Ian U. Roederer, James E. Lawler, Elizabeth A. Den Hartog, Vinicius M. Placco, Rebecca Surman | Summary: We present a nearly complete rapid neutron-capture process (r-process) chemical inventory of the metal-poor ([Fe/H] = -1.46 +/- 0.10) r-process-enhanced ([Eu/Fe] = +1.32 +/- 0.08) halo star HD 222925. This […]

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The R-Process Alliance: A Nearly Complete R-Process Abundance Template Derived from Ultraviolet Spectroscopy of the R-Process-Enhanced Metal-Poor Star HD 222925

Posted by klaurent May 6, 2022MIT

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Gravothermal solutions of SIDM halos: mapping from constant to velocity-dependent cross section

Posted by klaurent May 5, 2022Peking

Shengqi Yang, Xiaolong Du, Zhichao Carton Zeng, Andrew Benson, Fangzhou Jiang | Summary: [[{“value”:”The scale-free gravothermal fluid formalism has long proved effective in describing the evolution of self-interacting dark matter halos with a constant dark matter particle cross section. However, whether the gravothermal fluid solutions match numerical simulations for velocity-dependent cross-section scenarios remains untested. In […]

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Kepler K2 and TESS observations of two magnetic cataclysmic variables: The new asynchronous polar SDSS J084617.11+245344.1 and Paloma

Posted by klaurent May 5, 2022May 17, 2022MIT

Kavli Affiliate: Saul A. Rappaport | First 5 Authors: Colin Littlefield, D. W. Hoard, Peter Garnavich, Paula Szkody, Paul A. Mason | Summary: There have been relatively few published long-duration, uninterrupted light curves of magnetic cataclysmic variable stars in which the accreting white dwarf’s rotational frequency is slightly desynchronized from the binary orbital frequency (asynchronous […]

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Proximity-Induced Superconductivity in Epitaxial Topological Insulator/Graphene/Gallium Heterostructures

Posted by klaurent May 5, 2022Peking

Kavli Affiliate: Ke Wang | First 5 Authors: Cequn Li, Yi-Fan Zhao, Alexander Vera, Omri Lesser, Hemian Yi | Summary: The introduction of superconductivity to the Dirac surface states of a topological insulator leads to a novel state of matter known as a topological superconductor. A topological superconductor may host Majorana zero modes, the braiding […]

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