Axially symmetric, uniformly rotating neutron stars in general relativity: a non-perturbative approach

1993 ◽  
Vol 25 (12) ◽  
pp. 1277-1293 ◽  
Author(s):  
Giulio Magli
Keyword(s):  
General Relativity ◽  
Neutron Stars ◽  
Axially Symmetric ◽  
Perturbative Approach

scholarly journals Perturbative approach to the structure of rapidly rotating neutron stars

2005 ◽  
Vol 72 (4) ◽  
Author(s):  
Omar Benhar ◽  
Valeria Ferrari ◽  
Leonardo Gualtieri ◽  
Stefania Marassi
Keyword(s):  
Neutron Stars ◽  
Perturbative Approach

scholarly journals Neutron stars as probes of dark matter

2020 ◽  
Vol 29 (14) ◽  
pp. 2043028
Author(s):  
M. Ángeles Pérez-García ◽  
Joseph Silk
Keyword(s):  
General Relativity ◽  
Dark Matter ◽  
Equation Of State ◽  
Neutron Stars ◽  
Internal Structure ◽  
Stellar Objects ◽  
Ordinary Matter ◽  
Stable Solutions ◽  
The Universe

Neutron Stars (NSs) are compact stellar objects that are stable solutions in General Relativity. Their internal structure is usually described using an equation of state that involves the presence of ordinary matter and its interactions. However there is now a large consensus that an elusive sector of matter in the universe, described as dark matter, remains as yet undiscovered. In such a case, NSs should contain both, baryonic and dark matter. We argue that depending on the nature of the dark matter and in certain circumstances, the two matter components would form a mixture inside NSs that could trigger further changes, some of them observable. The very existence of NSs constrains the nature and interactions of dark matter in the universe.

The stellar graveyard

2019 ◽  
pp. 177-206
Author(s):  
Nils Andersson
Keyword(s):  
Black Holes ◽  
General Relativity ◽  
Neutron Stars ◽  
Gravitational Wave ◽  
Stellar Evolution ◽  
White Dwarfs ◽  
Supermassive Black Holes ◽  
Compact Objects ◽  
Fermi Gases ◽  
The 1950S

This chapter introduces the different classes of compact objects—white dwarfs, neutron stars, and black holes—that are relevant for gravitational-wave astronomy. The ideas are placed in the context of developing an understanding of the likely endpoint(s) of stellar evolution. Key ideas like Fermi gases and the Chandrasekhar mass are discussed, as is the emergence of general relativity as a cornerstone of astrophysics in the 1950s. Issues associated with different formation channels for, in particular, black holes are considered. The chapter ends with a discussion of the supermassive black holes that are found at the centre of galaxies.

scholarly journals Radio emission from a pulsar’s magnetic pole revealed by general relativity

Science ◽  
2019 ◽  
Vol 365 (6457) ◽  
pp. 1013-1017 ◽  
Author(s):  
Gregory Desvignes ◽  
Michael Kramer ◽  
Kejia Lee ◽  
Joeri van Leeuwen ◽  
Ingrid Stairs ◽  
...  
Keyword(s):  
General Relativity ◽  
Neutron Star ◽  
Radio Emission ◽  
Neutron Stars ◽  
Geometrical Model ◽  
Spin Axis ◽  
Magnetic Pole ◽  
Polarization Model ◽  
Binary Pulsars ◽  
Relativistic Treatment

Binary pulsars are affected by general relativity (GR), causing the spin axis of each pulsar to precess. We present polarimetric radio observations of the pulsar PSR J1906+0746 that demonstrate the validity of the geometrical model of pulsar polarization. We reconstruct the (sky-projected) polarization emission map over the pulsar’s magnetic pole and predict the disappearance of the detectable emission by 2028. Two tests of GR are performed using this system, including the spin precession for strongly self-gravitating bodies. We constrain the relativistic treatment of the pulsar polarization model and measure the pulsar beaming fraction, with implications for the population of neutron stars and the expected rate of neutron star mergers.

COVARIANT ANALYSIS OF NEWTONIAN MULTI-FLUID MODELS FOR NEUTRON STARS I: MILNE–CARTAN STRUCTURE AND VARIATIONAL FORMULATION

2004 ◽  
Vol 13 (02) ◽  
pp. 291-325 ◽  
Author(s):  
BRANDON CARTER ◽  
NICOLAS CHAMEL
Keyword(s):  
General Relativity ◽  
Neutron Stars ◽  
Variational Formulation ◽  
Traditional Approach ◽  
Fluid Models ◽  
Cartan Connection ◽  
Variational Treatment ◽  
Spacetime Structure ◽  
General Kind ◽  
Perfect Fluid Models

This is the first of a series of articles showing how 4 dimensionally covariant analytical procedures developed in the context of General Relativity can be usefully adapted for application in a purely Newtonian framework where they provide physical insights (e.g. concerning helicity currents) that are not so easy to obtain by the traditional approach based on a 3+1 spacetime decomposition. After an introductory presentation of the relevant Milne spacetime structure and the associated Cartan connection, the essential principles are illustrated by application to the variational formulation of simple barotropic perfect fluid models. This variational treatment is then extended to conservative multiconstituent self-gravitating fluid models of the more general kind that is needed for treating the effects of superfluidity in neutron stars.

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