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Proceedings, Volume 17, RPRA 2019

Recent Progress in Relativistic Astrophysics

Fudan University, Shanghai, China | 6–8 May 2019

Volume Editors: Prof. Dr. Cosimo Bambi, Dr. Sourabh Nampalliwar

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Cover Story (view full-size image) Black holes and neutron stars are the most extreme objects that can be found today in the Universe [...] Read more.
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Research

Open AccessProceedings
Black Holes in General Relativity and Beyond
Published: 14 June 2019
Viewed by 247 | PDF Full-text (400 KB)
Abstract
The recent detections of gravitational waves from binary systems of black holes are in remarkable agreement with the predictions of General Relativity. In this pedagogical mini-review, I go through the physics of the different phases of the evolution of black hole binary systems, [...] Read more.
The recent detections of gravitational waves from binary systems of black holes are in remarkable agreement with the predictions of General Relativity. In this pedagogical mini-review, I go through the physics of the different phases of the evolution of black hole binary systems, providing a qualitative physical interpretation of each one of them. I also briefly describe how these phases would be modified if gravitation were described by a theory extending or deforming General Relativity, or if the binary components turned out to be more exotic compact objects than black holes. Full article
Open AccessProceedings
Testing General Relativity with Supermassive Black Holes Using X-Ray Reflection Spectroscopy
Published: 18 June 2019
Viewed by 170 | PDF Full-text (2227 KB)
Abstract
In this paper, we review our current efforts to test General Relativity in the strong field regime by studying the reflection spectrum of supermassive black holes. So far we have analyzed 11 sources with observations of NuSTAR, Suzaku, Swift, and [...] Read more.
In this paper, we review our current efforts to test General Relativity in the strong field regime by studying the reflection spectrum of supermassive black holes. So far we have analyzed 11 sources with observations of NuSTAR, Suzaku, Swift, and XMM-Newton. Our results are consistent with General Relativity, according to which the spacetime metric around astrophysical black holes should be well approximated by the Kerr solution. We discuss the systematic uncertainties in our model and we present a preliminary study on the impact of some of them on the measurement of the spacetime metric. Full article
Open AccessProceedings
Testing Fifth Forces from the Galactic Dark Matter
Published: 5 July 2019
Viewed by 129 | PDF Full-text (245 KB)
Abstract
Is there an unknown long-range force between dark matter (DM) and ordinary matters? When such a fifth force exists and in the case that it is ignored, the equivalence principle (EP) is violated apparently. The violation of EP was severely constrained by, for [...] Read more.
Is there an unknown long-range force between dark matter (DM) and ordinary matters? When such a fifth force exists and in the case that it is ignored, the equivalence principle (EP) is violated apparently. The violation of EP was severely constrained by, for examples, the Eöt–Wash laboratory experiments, the lunar laser ranging, the MICROSCOPE satellite, and the long-term observation of binary pulsars. We discuss a recent bound that comes from PSR J1713+0747. When it is combined with the other bounds, a compelling limit on the hypothetical fifth force is derived. For the neutral hydrogen, the strength of such a fifth force should not exceed 1 % of the gravity. Full article
(This article belongs to the Section Physical Sciences)
Proceedings EISSN 2504-3900 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
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