scholarly journals Merger of white dwarf-neutron star binaries: Prelude to hydrodynamic simulations in general relativity

2009 ◽  
Vol 80 (2) ◽  
Author(s):  
Vasileios Paschalidis ◽  
Morgan MacLeod ◽  
Thomas W. Baumgarte ◽  
Stuart L. Shapiro
Keyword(s):  
General Relativity ◽  
Neutron Star ◽  
White Dwarf ◽  
Hydrodynamic Simulations

scholarly journals Binary pulsars and tests of general relativity

2009 ◽  
Vol 5 (S261) ◽  
pp. 218-227 ◽  
Author(s):  
I. H. Stairs
Keyword(s):  
General Relativity ◽  
Neutron Star ◽  
White Dwarf ◽  
Strong Field ◽  
Binding Energies ◽  
Tests Of General Relativity ◽  
Binary Pulsars ◽  
The Difference

AbstractBinary pulsars are a valuable laboratory for gravitational experiments. Double-neutron-star systems such as the double pulsar provide the most stringent tests of strong-field gravity available to date, while pulsars with white-dwarf companions constrain departures from general relativity based on the difference in gravitational binding energies in the two stars. Future observations may open up entirely new tests of the predictions of general relativity.

The Development of a Black Hole—The Oppenheimer-Snyder Dust Cloud

1972 ◽  
Vol 2 (2) ◽  
pp. 110-111
Author(s):  
P. Szekeres
Keyword(s):  
General Relativity ◽  
Black Hole ◽  
Neutron Star ◽  
Gravitational Collapse ◽  
White Dwarf ◽  
Physical Mechanism ◽  
Critical Radius ◽  
Dust Cloud ◽  
Schwarzschild Solution

When a star of mass ≳ 2M⊙ collapses there does not appear to exist any physical mechanism to prevent total gravitational collapse, unless in some miraculous way the star always manages to blow off enough mass for it to settle down into a stable neutron star or white dwarf configuration. General relativity is needed in order to handle the ultimate situation, and the theory predicts a critical radius ρ = 2m (in units such that G = c = 1) at which the coordinates in the Schwarzschild solutionbecome invalid.

scholarly journals Interpretation of Binary Pulsar Observations

1981 ◽  
Vol 95 ◽  
pp. 371-378 ◽  
Author(s):  
R. D. Blandford ◽  
W. M. DeCampli
Keyword(s):  
General Relativity ◽  
Neutron Star ◽  
White Dwarf ◽  
Radio Pulsar ◽  
Binary Pulsar ◽  
Orbital Decay

The nature, dynamics and evolution of the three known radio pulsar binaries are discussed. The system containing 1913+16 appears to comprise two ~1.4 M⊙ components, and to undergo orbital decay as predicted by general relativity. It is proposed that 1913+16 has a neutron star companion and that 0655+64 and 0820+02 have white dwarf companions which should be observable optically.

Aspects of the Collapse of Compact Objects

1980 ◽  
Vol 4 (1) ◽  
pp. 49-50
Author(s):  
R. A. Gingold ◽  
J. J. Monaghan
Keyword(s):  
Neutron Star ◽  
Neutron Stars ◽  
White Dwarf ◽  
Compact Objects ◽  
Dwarf Star

Misner Thorne and Wheeler (1973), (page 629) suggested that a freshly formed White Dwarf star of several solar masses would, if slowly — rotating, collapse to form a neutron star pancake which would become unstable and eventually produce several, possibly colliding, neutron stars.

Merger of black hole and neutron star in general relativity

2008 ◽  
Author(s):  
Masaru Shibata ◽  
Keisuke Taniguchi ◽  
Koji Uryū ◽  
Ye-Fei Yuan ◽  
Xiang-Dong Li ◽  
...  
Keyword(s):  
General Relativity ◽  
Black Hole ◽  
Neutron Star

scholarly journals Black hole, neutron star and white dwarf candidates from microlensing with OGLE-III

2016 ◽  
Vol 458 (3) ◽  
pp. 3012-3026 ◽  
Author(s):  
Ł. Wyrzykowski ◽  
Z. Kostrzewa-Rutkowska ◽  
J. Skowron ◽  
K. A. Rybicki ◽  
P. Mróz ◽  
...  
Keyword(s):  
Black Hole ◽  
Neutron Star ◽  
White Dwarf

scholarly journals A neutron star–white dwarf binary model for periodically active fast radio burst sources

2020 ◽  
Vol 497 (2) ◽  
pp. 1543-1546 ◽  
Author(s):  
Wei-Min Gu ◽  
Tuan Yi ◽  
Tong Liu
Keyword(s):  
Neutron Star ◽  
Radio Burst ◽  
Duty Cycle ◽  
White Dwarf ◽  
Burst Activity ◽  
Compact Binary ◽  
Binary Model ◽  
Duty Cycles ◽  
Curvature Radiation ◽  
Fast Radio Burst

ABSTRACT We propose a compact binary model with an eccentric orbit to explain periodically active fast radio burst (FRB) sources, where the system consists of a neutron star (NS) with strong dipolar magnetic fields and a magnetic white dwarf (WD). In our model, the WD fills its Roche lobe at periastron, and mass transfer occurs from the WD to the NS around this point. The accreted material may be fragmented into a number of parts, which arrive at the NS at different times. The fragmented magnetized material may trigger magnetic reconnection near the NS surface. The electrons can be accelerated to an ultrarelativistic speed, and therefore the curvature radiation of the electrons can account for the burst activity. In this scenario, the duty cycle of burst activity is related to the orbital period of the binary. We show that such a model may work for duty cycles roughly from 10 min to 2 d. For the recently reported 16.35-d periodicity of FRB 180916.J0158 + 65, our model does not naturally explain such a long duty cycle, since an extremely high eccentricity (e > 0.95) is required.

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