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Gravitational Test Beyond the First Post-Newtonian Order with the Shadow of the M87 Black Hole
Dimitrios Psaltis, Lia Medeiros, Pierre Christian +185
The 2017 Event Horizon Telescope (EHT) observations of the central source in M87 have led to the first measurement of the size of a black-hole shadow. This observation offers a new…
Tests of conservation laws in post-Newtonian gravity with binary pulsars
Xueli Miao, Junjie Zhao, Lijing Shao +3
General relativity is a fully conservative theory, but there exist other possible metric theories of gravity. We consider non-conservative ones with a parameterized post-Newtonian…
An improved test of the strong equivalence principle with the pulsar in a triple star system
Guillaume Voisin, Ismaël Cognard, Paulo Freire +5
The gravitational strong equivalence principle (SEP) is a cornerstone of the general theory of relativity (GR). The extreme difference in binding energy between neutron stars and w…
How to tell an accreting boson star from a black hole
Hector Olivares, Ziri Younsi, Christian M. Fromm +6
The capability of the Event Horizon Telescope (EHT) to image the nearest supermassive black hole candidates at horizon-scale resolutions offers a novel means to study gravity in it…
Black holes, gravitational waves and fundamental physics: a roadmap
Leor Barack, Vitor Cardoso, Samaya Nissanke +203
The grand challenges of contemporary fundamental physics---dark matter, dark energy, vacuum energy, inflation and early universe cosmology, singularities and the hierarchy problem-…
Testing the universality of free fall towards dark matter with radio pulsars
Lijing Shao, Norbert Wex, Michael Kramer
The violation of the weak equivalence principle (EP) in the gravitational field of the Earth, described by the Eötvös parameter , was recently constrained to the level $\…
Constraining nonperturbative strong-field effects in scalar-tensor gravity by combining pulsar timing and laser-interferometer gravitational-wave detectors
Lijing Shao, Noah Sennett, Alessandra Buonanno +2
Pulsar timing and gravitational-wave (GW) detectors are superb laboratories to study gravity theories in the strong-field regime. Here we combine those tools to test the mono-scala…
The Black Hole Accretion Code
Oliver Porth, Hector Olivares, Yosuke Mizuno +5
We present the black hole accretion code (BHAC), a new multidimensional general-relativistic magnetohydrodynamics module for the MPI-AMRVAC framework. BHAC has been designed to sol…
New tests of local Lorentz invariance and local position invariance of gravity with pulsars
Lijing Shao, Norbert Wex, Michael Kramer
New tests are proposed to constrain possible deviations from local Lorentz invariance and local position invariance in the gravity sector. By using precise timing results of two bi…
New Constraints on Preferred Frame Effects from Binary Pulsars
Lijing Shao, Norbert Wex, Michael Kramer
Preferred frame effects (PFEs) are predicted by a number of alternative gravity theories which include vector or additional tensor fields, besides the canonical metric tensor. In t…
Tests of the universality of free fall for strongly self-gravitating bodies with radio pulsars
Paulo C. C. Freire, Michael Kramer, Norbert Wex
In this paper, we review tests of the strong equivalence principle (SEP) derived from pulsar-white dwarf data. The extreme difference in binding energy between both components and…
Upper limits on gravitational wave emission from 78 radio pulsars
The LIGO Scientific Collaboration, B. Abbott, M. Kramer +1
We present upper limits on the gravitational wave emission from 78 radio pulsars based on data from the third and fourth science runs of the LIGO and GEO600 gravitational wave dete…