Astrophysics – Page 336 – Kavli Institute Pre-Print Publications

Exploring Ultralight Scalar Assistance in Sterile Neutrino Dark Matter: Cold Spectrum and Unusual X/Gamma-ray Signatures

Posted by klaurent May 14, 2023Tokyo

Kavli Affiliate: Jia Liu | First 5 Authors: Yuxuan He, Jia Liu, Xiaolin Ma, Xiao-Ping Wang, | Summary: We present a scalar-driven sterile neutrino production model where the interaction with the ultralight scalar field modifies the oscillation production of sterile neutrinos in the early universe. The model effectively suppresses the production of sterile neutrinos at […]

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Measurement of $C!P$ violation in $B^{0}rightarrow K_{S}^{0}π^{0}$ decays at Belle II

Posted by dbos Tokyo

Kavli Affiliate: T. Higuchi | First 5 Authors: Belle II Collaboration, I. Adachi, K. Adamczyk, L. Aggarwal, H. Ahmed | Summary: We report a measurement of the $C!P$-violating parameters $A$ and $S$ in $B^{0}to K_{S}^{0} pi^{0}$ decays at Belle II using a sample of $387times 10^{6}$ $Bbar{B}$ events recorded in $e^{+}e^{-}$ collisions at a center-of-mass […]

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Mini-Quenching of High-Redshift Galaxies by Bursty Star Formation

Posted by klaurent May 11, 2023Cambridge

Kavli Affiliate: George Efstathiou | First 5 Authors: Tibor Dome, Sandro Tacchella, Anastasia Fialkov, Avishai Dekel, Omri Ginzburg | Summary: The recent observation of a low-mass $z=5.2$ and an intermediate-mass $z=7.3$ (JADES-GS-z7-01-QU) quenched galaxy with JWST / NIRSpec is the first evidence of halted star formation above $zsim 5$. Here we show how bursty star […]

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Mini-quenching of $z=4-8$ galaxies by bursty star formation

Posted by dbos May 11, 2023Cambridge

Kavli Affiliate: George Efstathiou | First 5 Authors: Tibor Dome, Sandro Tacchella, Anastasia Fialkov, Daniel Ceverino, Avishai Dekel | Summary: The recent reported discovery of a low-mass $z=5.2$ and an intermediate-mass $z=7.3$ quenched galaxy with JWST/NIRSpec is the first evidence of halted star formation above $zapprox 5$. Here we show how bursty star formation at […]

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The Magnificent Five Images of Supernova Refsdal: Time Delay and Magnification Measurements

Posted by klaurent May 10, 2023Cambridge

Kavli Affiliate: Kaisey Mandel | First 5 Authors: Patrick L. Kelly, Steven Rodney, Tommaso Treu, Simon Birrer, Vivien Bonvin | Summary: In late 2014, four images of Supernova (SN) "Refsdal," the first known example of a strongly lensed SN with multiple resolved images, were detected in the MACS J1149 galaxy-cluster field. Following the images’ discovery, […]

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Constraints on the Hubble constant from Supernova Refsdal’s reappearance

Posted by klaurent May 10, 2023Cambridge

Kavli Affiliate: Kaisey Mandel | First 5 Authors: Patrick L. Kelly, Steven Rodney, Tommaso Treu, Masamune Oguri, Wenlei Chen | Summary: The gravitationally lensed Supernova Refsdal appeared in multiple images, produced through gravitational lensing by a massive foreground galaxy cluster. After the supernova appeared in 2014, lens models of the galaxy cluster predicted an additional […]

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Constraints on the Hubble constant from Supernova Refsdal’s reappearance

Posted by klaurent May 10, 2023Cambridge

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Constraints on the Hubble constant from Supernova Refsdal’s reappearance

Posted by klaurent May 10, 2023Cambridge

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Twin Sterile Neutrino Dark Matter

Posted by May 10, 2023Chicago

Kavli Affiliate: Gordan Krnjaic | First 5 Authors: Ian Holst, Dan Hooper, Gordan Krnjaic, Deheng Song, | Summary: We propose that the dark matter of our Universe could be sterile neutrinos which reside within the twin sector of a mirror twin Higgs model. In our scenario, these particles are produced through a version of the […]

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A 1.55 R$_{oplus}$ habitable-zone planet hosted by TOI-715, an M4 star near the ecliptic South Pole

Posted by klaurent May 10, 2023MIT

Kavli Affiliate: Christopher J. Burke | First 5 Authors: Georgina Dransfield, Mathilde Timmermans, Amaury H. M. J. Triaud, Martín Dévora-Pajares, Christian Aganze | Summary: A new generation of observatories is enabling detailed study of exoplanetary atmospheres and the diversity of alien climates, allowing us to seek evidence for extraterrestrial biological and geological processes. Now is […]

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