Bulletin of the American Physical Society
APS April Meeting 2019
Volume 64, Number 3
Saturday–Tuesday, April 13–16, 2019; Denver, Colorado
Session X11: Exact Solutions and Mathematical Relativity
10:45 AM–12:09 PM,
Tuesday, April 16, 2019
Sheraton
Room: Governor's Square 17
Sponsoring
Unit:
DGRAV
Chair: Sam Gralla, University of Arizona
Abstract: X11.00001 : An analytic metric for the exterior spacetime of neutron stars in scalar-Gauss-Bonnet gravity*
10:45 AM–10:57 AM
View Presentation Abstract
Presenter:
Alexander G Saffer
(Montana State University, Bozeman)
Authors:
Alexander G Saffer
(Montana State University, Bozeman)
Hector Okada da Silva
(Montana State University, Bozeman)
Nicolas Yunes
(Montana State University, Bozeman)
Probing the interior composition of neutron stars is currently an active research area in nuclear physics. Experiments, such as the Neutron star Interior Composition ExploreR (NICER), are aiming to probe the composition of neutron stars based on pulse profiles of X-ray hot-spots. To understand what these profiles look like, accurate knowledge of the space-time right outside a neutron star is needed. In this talk, I will present an analytical exterior metric for a neutron star in scalar-Gauss-Bonnet gravity. This metric modifies a variety of general relativity properties, such as the innermost stable circular orbit and Kepler's third law for a small body in orbit around a neutron star, as well as the visible fraction of the star, which can be observed with X-ray telescopes. In the future, light curves generated with this new metric could be compared to real light curve data from NICER to place constraints on scalar-Gauss-Bonnet gravity.
*NSF Grant No. PHY-1607130 and NASA grants NNX16AB98G and 80NSSC17M0041.
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