Malaise and remedy of binary boson-star initial data
Kavli Affiliate: Ulrich Sperhake | First 5 Authors: Thomas Helfer, Ulrich Sperhake, Robin Croft, Miren Radia, Bo-Xuan Ge | Summary: Through numerical simulations of boson-star head-on collisions, we explore the quality of binary initial data obtained from the superposition of single-star spacetimes. Our results demonstrate that evolutions starting from a plain superposition of individual boosted […]
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Black hole mergers in compact star clusters and massive black hole formation beyond the mass-gap
Kavli Affiliate: Rainer Spurzem | First 5 Authors: Francesco Paolo Rizzuto, Thorsten Naab, Rainer Spurzem, Manuel Arca-Sedda, Mirek Giersz | Summary: We present direct N-body simulations, carried out with Nbody6++GPU, of young and compact low metallicity star clusters with $1.1times 10^5$ stars, a velocity dispersion of $sim$ 10 $mathrm{km,s^{-1}}$, a half mass radius $R_h=0.6$ pc, […]
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TOI-1518b: A Misaligned Ultra-hot Jupiter with Iron in its Atmosphere
Kavli Affiliate: Edward H. Morgan | First 5 Authors: Samuel H. C. Cabot, Aaron Bello-Arufe, João M. Mendonça, René Tronsgaard, Ian Wong | Summary: We present the discovery of TOI-1518b — an ultra-hot Jupiter orbiting a bright star $V = 8.95$. The transiting planet is confirmed using high-resolution optical transmission spectra from EXPRES. It is […]
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Towards a Realistic Model of Dark Atoms to Resolve the Hubble Tension
Kavli Affiliate: Gordan Krnjaic | First 5 Authors: Nikita Blinov, Gordan Krnjaic, Shirley Weishi Li, , | Summary: It has recently been shown that a subdominant hidden sector of atomic dark matter in the early universe can resolve the Hubble tension while maintaining good agreement with most precision cosmological observables. However, such a solution requires […]
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Finite thermal particle creation of Casimir light
Kavli Affiliate: Frank Wilczek | First 5 Authors: Michael R. R. Good, Eric V Linder, Frank Wilczek, , | Summary: A new solution for an analytic spectrum of particle creation by an accelerating mirror (dynamical Casimir effect) is given. It is the first model to simultaneously radiate thermally and emit a finite number of particles. […]
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Estimating the effective lifetime of the $zsim6$ quasar population from the composite proximity zone profile
Kavli Affiliate: Robert A. Simcoe | First 5 Authors: Karna A. Morey, Anna-Christina Eilers, Frederick B. Davies, Joseph F. Hennawi, Robert A. Simcoe | Summary: The lifetime of quasars can be estimated by means of their proximity zone sizes, which are regions of enhanced flux bluewards of the Lyman-$alpha$ emission line observed in the rest-frame […]
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Gravitational wave propagation beyond general relativity: waveform distortions and echoes
Kavli Affiliate: Wayne Hu | First 5 Authors: Jose Maria Ezquiaga, Wayne Hu, Macarena Lagos, Meng-Xiang Lin, | Summary: We study the cosmological propagation of gravitational waves (GWs) beyond general relativity (GR) across homogeneous and isotropic backgrounds. We consider scenarios in which GWs interact with an additional tensor field and use a parametrized phenomenological approach […]
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Toroidal and Elliptic Quiver BPS Algebras and Beyond
Kavli Affiliate: Masahito Yamazaki | First 5 Authors: Dmitry Galakhov, Wei Li, Masahito Yamazaki, , | Summary: The quiver Yangian, an infinite-dimensional algebra introduced recently in arXiv:2003.08909, is the algebra underlying BPS state counting problems for toric Calabi-Yau three-folds. We introduce trigonometric and elliptic analogues of quiver Yangians, which we call toroidal quiver algebras and […]
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Anarchic Federated Learning
Kavli Affiliate: Jia Liu | First 5 Authors: Haibo Yang, Xin Zhang, Prashant Khanduri, Jia Liu, | Summary: Present-day federated learning (FL) systems deployed over edge networks consists of a large number of workers with high degrees of heterogeneity in data and/or computing capabilities, which call for flexible worker participation in terms of timing, effort, […]
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