Metal-poor stars observed with the Magellan Telescope. IV. Neutron-capture element signatures in 27 main-sequence stars

Posted by dbos MIT

Kavli Affiliate: Anna Frebel | First 5 Authors: Mohammad K. Mardini, Anna Frebel, Leyatt Betre, Heather Jacobson, John E. Norris | Summary: Based on high-resolution spectra obtained with Magellan/MIKE, we present a chemo-dynamical analysis for 27 near main-sequence turnoff metal-poor stars, including 20 stars analyzed for the first time. The sample spans a range in […]


Continue.. Metal-poor stars observed with the Magellan Telescope. IV. Neutron-capture element signatures in 27 main-sequence stars

Constraining SIDM cross section models with a joint analysis of galaxies and clusters

Posted by klaurent Peking

Shengqi Yang, Fangzhou Jiang, Andrew Benson, Yi-Ming Zhong, Charlie Mace | Summary: [[{“value”:”One necessary step for probing the nature of self-interacting dark matter (SIDM) particles with astrophysical observations is to pin down any possible velocity dependence in the SIDM cross section. Major challenges for achieving this goal include eliminating, or mitigating, the impact of the […]


Continue.. Constraining SIDM cross section models with a joint analysis of galaxies and clusters

A quantitative comparison between velocity dependent SIDM cross sections constrained by the gravothermal and isothermal models

Posted by Peking

Shengqi Yang, Fangzhou Jiang, Andrew Benson, Yi-Ming Zhong, Charlie Mace | Summary: [[{“value”:”One necessary step for probing the nature of self-interacting dark matter (SIDM) particles with astrophysical observations is to pin down any possible velocity dependence in the SIDM cross section. Major challenges for achieving this goal include eliminating, or mitigating, the impact of the […]


Continue.. A quantitative comparison between velocity dependent SIDM cross sections constrained by the gravothermal and isothermal models

A quantitative comparison between velocity dependent SIDM cross sections constrained by the gravothermal and isothermal models

Posted by Peking

Shengqi Yang, Fangzhou Jiang, Andrew Benson, Yi-Ming Zhong, Charlie Mace | Summary: [[{“value”:”One necessary step for probing the nature of self-interacting dark matter (SIDM) particles with astrophysical observations is to pin down any possible velocity dependence in the SIDM cross section. Major challenges for achieving this goal include eliminating, or mitigating, the impact of the […]


Continue.. A quantitative comparison between velocity dependent SIDM cross sections constrained by the gravothermal and isothermal models

Exploration biases how forelimb reaches to a spatial target are learned

Posted by klaurent Columbia

Kavli Affiliate: Costa, Rui | Authors: Alice C Mosberger, Leslie J Sibener, Tiffany X Chen, Helio FM Rodrigues, Richard Hormigo, James N Ingram, Vivek R Athalye, Tanya Tabachnik, Daniel M Wolpert, James M Murray and Rui M Costa | Summary: The brain can learn to generate actions, such as reaching to a target, using different […]


Continue.. Exploration biases how forelimb reaches to a spatial target are learned

Calculating the Gravitational Waves Emitted from High-speed Sources

Posted by klaurent Peking

Kavli Affiliate: Xian Chen | First 5 Authors: Han Yan, Xian Chen, Alejandro Torres-Orjuela, , | Summary: The possibility of forming gravitational-wave sources with high center-of-mass (c.m.) velocities in the vicinity of supermassive black holes requires us to develop a method of deriving the waveform in the observer’s frame. Here we show that in the […]


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SENSEI: Search for Millicharged Particles produced in the NuMI Beam

Posted by Chicago

Kavli Affiliate: Michael Crisler | First 5 Authors: Liron Barak, Itay M. Bloch, Ana M. Botti, Mariano Cababie, Gustavo Cancelo | Summary: Millicharged particles appear in several extensions of the Standard Model, but have not yet been detected. These hypothetical particles could be produced by an intense proton beam striking a fixed target. We use […]


Continue.. SENSEI: Search for Millicharged Particles produced in the NuMI Beam

SENSEI: Search for Millicharged Particles produced in the NuMI Beam

Posted by Chicago

Kavli Affiliate: Michael Crisler | First 5 Authors: Liron Barak, Itay M. Bloch, Ana M. Botti, Mariano Cababie, Gustavo Cancelo | Summary: Millicharged particles appear in several extensions of the Standard Model, but have not yet been detected. These hypothetical particles could be produced by an intense proton beam striking a fixed target. We use […]


Continue.. SENSEI: Search for Millicharged Particles produced in the NuMI Beam

Zonal flows and reversals of cortically confined active suspensions

Posted by klaurent Harvard

Kavli Affiliate: L. Mahadevan | First 5 Authors: J. S. Yodh, F. Giardina, S. Gokhale, L. Mahadevan, | Summary: At sufficiently high concentrations, motile bacteria suspended in fluids exhibit a range of ordered and disordered collective motions. Here we explore the combined effects of confinement, periodicity and curvature induced by the active motion of E. […]


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Precise Masses, Ages of ~1.0 million RGB and RC stars observed by the LAMOST

Posted by klaurent Peking

Kavli Affiliate: Huawei Zhang | First 5 Authors: Chun Wang, Yang Huang, Yutao Zhou, Huawei Zhang, | Summary: We construct a catalogue of stellar masses and ages for 696,680 red giant branch (RGB) stars, 180,436 primary red clump (RC) stars, and 120,907 secondary RC stars selected from the LAMOST,DR8. The RGBs, primary RCs, and secondary […]


Continue.. Precise Masses, Ages of ~1.0 million RGB and RC stars observed by the LAMOST