scholarly journals Analytical approximation of the exterior gravitational field of rotating neutron stars

2011 ◽  
Vol 28 (15) ◽  
pp. 155015 ◽  
Author(s):  
C Teichmüller ◽  
M B Fröb ◽  
F Maucher
Keyword(s):  
Gravitational Field ◽  
Neutron Stars ◽  
Analytical Approximation

3. Extrasolar tests of gravity

2017 ◽  
pp. 35-45
Author(s):  
Timothy Clifton
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
Gravitational Field ◽  
Solar System ◽  
Neutron Stars ◽  
Event Horizon ◽  
Gravitational Fields ◽  
Binary Pulsars ◽  
Tests Of Gravity ◽  
Triple Star

By studying objects outside our Solar System, we can observe star systems with far greater gravitational fields. ‘Extrasolar tests of gravity’ considers stars of different sizes that have undergone gravitational collapse, including white dwarfs, neutron stars, and black holes. A black hole consists of a region of space-time enclosed by a surface called an event horizon. The gravitational field of a black hole is so strong that anything that finds its way inside the event horizon can never escape. Other star systems considered are binary pulsars and triple star systems. With the invention of even more powerful telescopes, there will be more tantalizing possibilities for testing gravity in the future.

Energy of Gravitational Field of Static Spherically Symmetric Neutron Stars

2003 ◽  
Vol 40 (5) ◽  
pp. 637-640
Author(s):  
Wen De-Hua ◽  
Chen Wei ◽  
Wang Xian-Ju ◽  
Ai Bao-Quan ◽  
Liu Guo-Tao ◽  
...  
Keyword(s):  
Gravitational Field ◽  
Neutron Stars ◽  
Spherically Symmetric

QUASI-STATIONARY ELECTROMAGNETIC EFFECTS IN CONDUCTORS AND SUPERCONDUCTORS IN SCHWARZSCHILD SPACE–TIME

2005 ◽  
Vol 14 (05) ◽  
pp. 817-835 ◽  
Author(s):  
B. J. AHMEDOV ◽  
F. J. FATTOYEV
Keyword(s):  
Magnetic Field ◽  
Gravitational Field ◽  
Neutron Stars ◽  
Penetration Depth ◽  
Skin Effect ◽  
Outer Core ◽  
Point Of View ◽  
Time Dependent ◽  
General Relativistic ◽  
Stationary Gravitational Field

The general principles needed to compute the effect of a stationary gravitational field on the quasistationary electromagnetic phenomena in normal conductors and superconductors are formulated from general relativistic point of view. Generalization of the skin effect, that is the general relativistic modification of the penetration depth (of the time-dependent magnetic field in the conductor) due to its relativistic coupling to the gravitational field is obtained. The effect of the gravitational field on the penetration and coherence depths in superconductors is also studied. As an illustration of the foregoing general results, we discuss their application to superconducting systems in the outer core of neutron stars. The relevance of these effects to electrodynamics of magnetized neutron stars has been shown.

scholarly journals The Gravitomagnetic Effects in Rapidly Rotating Neutron Stars: A Theoretical Study

2020 ◽  
Vol 2 (2) ◽  
pp. 149-157
Author(s):  
Atsnaita Yasrina ◽  
Nugroho Adi Pramono
Keyword(s):  
Magnetic Field ◽  
Gravitational Field ◽  
Neutron Star ◽  
Neutron Stars ◽  
Strong Magnetic Field ◽  
Rotational Speed ◽  
Distribution Density ◽  
Theoretical Study ◽  
Electromagnetic Measurements ◽  
General Relativistic

Electromagnetic measurements of a general relativistic gravitomagnetic effect can be done within the conductor embedded in a rotating gravitational object’s spacetime. Neutron stars are rotating gravitational object that have strong magnetic field. The gravitomagnetic effect in a neutron star can be determined from the distribution density in the conductor. Neutron star is assumed as a conductor and it rotates rapidly. The distribution density inside the conductor is obtained from the electromagnetic contravariant tensor and the relativistic rotational speed of the conductor. It has obtained the distribution density inside the conductor for the rapidly rotating neutron star. The results are compared to the slowly rotating neutron star which depends on the angular veolocity and the gravitational field.

scholarly journals Axionic dark matter halos in the gravitational field of baryonic matter

2020 ◽  
Vol 35 (26) ◽  
pp. 2050248
Author(s):  
Gennady P. Berman ◽  
Vyacheslav N. Gorshkov ◽  
Vladimir I. Tsifrinovich
Keyword(s):  
Dark Matter ◽  
Gravitational Field ◽  
Mean Field ◽  
Characteristic Size ◽  
Analytical Approximation ◽  
Einstein Condensate ◽  
Dark Matter Halo ◽  
Baryonic Matter ◽  
Hartree Fock ◽  
Bose Einstein Condensate

We consider a dark matter halo (DMH) of a spherical galaxy as a Bose–Einstein condensate (BEC) of the ultra-light axions (ULA) interacting with the baryonic matter. In the mean-field (MF) limit, we have derived the integro-differential equation of the Hartree–Fock type for the spherically symmetrical wave function of the DMH component. This equation includes two independent dimensionless parameters: (i) [Formula: see text] is the ratio of baryon and axion total mases and (ii) [Formula: see text] is the ratio of characteristic baryon and axion spatial parameters. We extended our “dissipation algorithm” for studying numerically the ground state of the axion halo in the gravitational field produced by the baryonic component. We calculated the characteristic size, [Formula: see text] of DMH as a function of [Formula: see text] and [Formula: see text] and obtained an analytical approximation for [Formula: see text].

scholarly journals Application of Information and Complexity Measures to Neutron Stars Structure

2019 ◽  
Vol 18 ◽  
pp. 163
Author(s):  
K. Ch. Chatzisavvas ◽  
V. P. Psonis ◽  
C. P. Panos ◽  
Ch. C. Moustakidis
Keyword(s):  
Gravitational Field ◽  
Neutron Star ◽  
Neutron Stars ◽  
Short Range ◽  
Nuclear Force ◽  
Low Complexity ◽  
Complexity Measures ◽  
Astronomical Observations ◽  
Equation Of States ◽  
Statistical Complexity

We apply several information and statistical complexity measures to neutron stars structure. Neutron stars is a classical example where the gravitational field and quantum behaviour are combined and produce a macroscopic dense object. We concentrate our study on the connection between complexity and neutron star properties, like maximum mass and the corresponding radius, applying a specific set of realistic equation of states. Moreover, the effect of the strength of the gravitational field on the neutron star structure and consequently on the complexity measure is also investigated. It is seen that neutron stars, consistent with astronomical observations so far, are ordered systems (low complexity), which cannot grow in complexity as their mass increases. This is a result of the interplay of gravity, the short-range nuclear force and the very short-range weak interaction.

4. Gravitational waves

2017 ◽  
pp. 46-57
Author(s):  
Timothy Clifton
Keyword(s):  
Gravitational Field ◽  
Neutron Stars ◽  
Gravitational Wave ◽  
Gravitational Waves ◽  
Laser Interferometer ◽  
Space Time ◽  
Binary Pulsar ◽  
Set Up ◽  
The Waves

As stars collapse they eject huge amounts of mass and energy; their gravitational field changes rapidly and, therefore, so does the curvature of the space-time around them. If the curvature of space-time is pushed out of equilibrium, by the motion of mass or energy, this disturbance travels outwards as waves. ‘Gravitational waves’ explains the effect of a gravitational wave: in a binary pulsar, the waves carry energy away from the system so that the two neutron stars slowly circle in towards each other. Gravitational waves were first detected in 2015 by the Laser Interferometer Gravitational-Wave Observatory in America. There are also plans to set up a detector in space.

scholarly journals Properties of Relativistic Linear Stellar Models

1982 ◽  
Vol 69 ◽  
pp. 73-78
Author(s):  
V. Ureche
Keyword(s):  
Black Holes ◽  
Gravitational Field ◽  
Neutron Stars ◽  
Stellar Evolution ◽  
Space Time ◽  
Relativistic Stars ◽  
Strong Gravitational Field ◽  
Stellar Models ◽  
Late Stages

In the late stages of stellar evolution, relativistic objects are formed, such as neutron stars or black holes. These relativistic stars possess a strong gravitational field, therefore their structure and their space-time geometry can be described only in the frame of GRT (Zeldovich and Novikov, 1971; Misner, Thorne and Wheeler, 1973). For this purpose, the following four-dimensional interval is used (spherical gravitational field), (Zeldovich and Novikov, 1971).

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