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Gravitational signal propagation in the Double Pulsar studied with the MeerKAT telescope
H. Hu, M. Kramer, D. J. Champion +16
The Double Pulsar, PSR J0737-3039A/B, has offered a wealth of gravitational experiments in the strong-field regime, all of which GR has passed with flying colours. In particular, a…
Resolving the inner parsec of the blazar J1924-2914 with the Event Horizon Telescope
Sara Issaoun, Maciek Wielgus, Svetlana Jorstad +27
The blazar J1924-2914 is a primary Event Horizon Telescope (EHT) calibrator for the Galactic Center's black hole Sagittarius A*. Here we present the first total and linearly polari…
Millimeter light curves of Sagittarius A* observed during the 2017 Event Horizon Telescope campaign
Maciek Wielgus, Nicola Marchili, Ivan Marti-Vidal +28
The Event Horizon Telescope (EHT) observed the compact radio source, Sagittarius A* (Sgr A*), in the Galactic Center on 2017 April 5-11 in the 1.3 millimeter wavelength band. At th…
One pulsar, two white dwarfs, and a planet confirming the strong equivalence principle
Guillaume Voisin, G Luth, I Cognard +7
The strong equivalence principle is a cornerstone of general relativity, tested with exquisite accuracy in the Solar system. However, tests in the strong-field regime require a com…
News and views regarding PSR J1757-1854, a highly-relativistic binary pulsar
A. D. Cameron, M. Bailes, V. Balakrishnan +13
We provide an update on the ongoing monitoring and study of the highly-relativistic double neutron star binary system PSR J1757-1854, a 21.5-ms pulsar in a highly eccentric, 4.4-ho…
Closing a spontaneous-scalarization window with binary pulsars
Junjie Zhao, Paulo C. C. Freire, Michael Kramer +2
Benefitting from the unequaled precision of the pulsar timing technique, binary pulsars are important testbeds of gravity theories, providing some of the tightest bounds on alterna…