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Understanding and improving the timing of PSR J0737-3039B
Aristeidis Noutsos, G. Desvignes, M. Kramer +11
The double pulsar (PSR J0737-3039A/B) provides some of the most stringent tests of general relativity (GR) and its alternatives. The success of this system in tests of GR is largel…
Revisiting profile instability of J1022+1001
Prajwal V. Padmanabh, Ewan D. Barr, David J. Champion +4
Millisecond pulsars in timing arrays can act as probes for gravitational wave detection and improving the solar system ephemerides among several other applications. However, the st…
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…
High-cadence observations and variable spin behaviour of magnetar Swift J1818.0-1607 after its outburst
David Champion, Ismael Cognard, Marilyn Cruces +17
We report on multi-frequency radio observations of the new magnetar Swift J1818.0-1607, following it for more than one month with high cadence. The observations commenced less than…
Constraining the dense matter equation-of-state with radio pulsars
Huanchen Hu, Michael Kramer, Norbert Wex +2
Radio pulsars provide some of the most important constraints for our understanding of matter at supranuclear densities. So far, these constraints are mostly given by precision mass…
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…
On the prospects of imaging Sagittarius A* from space
Freek Roelofs, Heino Falcke, Christiaan Brinkerink +8
Very Long Baseline Interferometry (VLBI) at sub-millimeter waves has the potential to image the shadow of the black hole in the Galactic Center, Sagittarius A* (Sgr A*), and thereb…
A Fast Radio Burst discovered in FAST drift scan survey
Weiwei Zhu, Di Li, Rui Luo +67
We report the discovery of a highly dispersed fast radio burst, FRB~181123, from an analysis of 1500~hr of drift-scan survey data taken using the Five-hundred-meter Aperture…
Timing stability of black widow pulsars
Ann-Sofie Bak Nielsen, Gemma H. Janssen, Golam Shaifullah +13
We study the timing stability of three black widow pulsars, both in terms of their long-term spin evolution and their shorter-term orbital stability. The erratic timing behaviour a…