Bulletin of the American Physical Society
APS April Meeting 2021
Volume 66, Number 5
Saturday–Tuesday, April 17–20, 2021; Virtual; Time Zone: Central Daylight Time, USA
Session E03: LIGO and NICER Constraints on the Neutron Star Equation of StateInvited Live
|
Hide Abstracts |
Sponsoring Units: DAP DGRAV Chair: Sanjay Reddy, University of Washington |
Saturday, April 17, 2021 3:45PM - 4:12PM Live |
E03.00001: Nuclear-Physics Predictions for the Equation of State of Neutron Stars Invited Speaker: Ingo Tews Neutron stars contain the largest reservoirs of degenerate fermions, reaching the highest densities we can observe in the cosmos, and probe matter under conditions that cannot be recreated in terrestrial experiments. Throughout the Universe, a large number of high-energy, cataclysmic astrophysical collisions of neutron stars are continuously occurring. These collisions provide an excellent testbed to probe the properties of matter at densities exceeding the density inside atomic nuclei, are an important site for the production of elements heavier than iron, and allow for an independent measurement of the expansion rate of our Universe. To understand these remarkable events, reliable nuclear-physics input is essential. In this talk, I will explain how to use chiral effective field theory and advanced Quantum Monte Carlo many-body methods to provide a consistent and systematic approach to strongly interacting systems with controlled theoretical uncertainties. I will present nuclear-physics predictions for the dense nucleonic matter relevant for neutron stars, and discuss how multi-messenger observations of binary neutron-star mergers can be used to further elucidate the properties of matter under extreme conditions and to measure the expansion rate of the Universe described by the Hubble constant. [Preview Abstract] |
Saturday, April 17, 2021 4:12PM - 4:39PM Live |
E03.00002: LIGO Constraints on the Neutron Star Equation of State Invited Speaker: Tanja Hinderer LIGO Constraints on the Neutron Star Equation of State [Preview Abstract] |
Saturday, April 17, 2021 4:39PM - 5:06PM Live |
E03.00003: NICER Constraints on the Neutron Star Equation of State Invited Speaker: Thomas Riley NICER is an X-ray telescope installed on the International Space Station. The primary science targets of NICER are rotation-powered millisecond pulsars. Megasecond exposures, together with state-of-the-art effective area, event time tagging, and energy resolution, yield data of unprecedented detail. Pulse-profile modeling of NICER event data yields statistical joint measurements of the mass and radius of a pulsar with typical precision of at least $\pm$10\%. Independent mass measurements derived by radio timing, which break a mass-radius degeneracy, boost the NICER radius measurement precision. The NICER collaboration is modeling multiple pulsars in this way, including the most massive known pulsar PSR J0740+6620. With a population of joint mass-radius measurements available, statistical measurements of the neutron star dense matter equation of state are viable. This talk will be a report of the latest measurements derived using the open source software package X-PSI (X-ray Pulse Simulation and Inference; github.com/ThomasEdwardRiley/xpsi) and nested sampling. [Preview Abstract] |
Saturday, April 17, 2021 5:06PM - 5:33PM Live |
E03.00004: NICER Constraints on the Neutron Star Equation of State Invited Speaker: Cole Miller Precise and reliable measurements of neutron star radii are essential to our understanding of cold, catalyzed matter beyond nuclear saturation density. The report by the NICER team that the isolated pulsar PSR J0030+0451 has a radius of $\sim 13\pm 1$ km and a mass of $\sim 1.44\pm 0.15$ solar masses provided significant new constraints on the properties of high-density matter, and updates on this result as well as radius measurements of other pulsars will substantially improve our knowledge about this critical regime of nuclear physics. I will present our analysis of NICER data on pulsars as well as their implications for the matter in neutron star cores. [Preview Abstract] |
Follow Us |
Engage
Become an APS Member |
My APS
Renew Membership |
Information for |
About APSThe American Physical Society (APS) is a non-profit membership organization working to advance the knowledge of physics. |
© 2024 American Physical Society
| All rights reserved | Terms of Use
| Contact Us
Headquarters
1 Physics Ellipse, College Park, MD 20740-3844
(301) 209-3200
Editorial Office
100 Motor Pkwy, Suite 110, Hauppauge, NY 11788
(631) 591-4000
Office of Public Affairs
529 14th St NW, Suite 1050, Washington, D.C. 20045-2001
(202) 662-8700