Effect of Adiabatic Index on Richtmyer-Meshkov Flows Induced by Strong Shocks

We have solved the General Relativistic Hydrodynamic (GRH) equations using the high resolution shock capturing scheme (HRSCS) to find out the dependency of the disk dynamics to the Mach number, adiabatic index, the black hole rotation parameter and the outer boundary of the computational domain around the non-rotating and rotating black holes. We inject the gas to computational domain at upstream and downstream regions at the same time with different initial conditions. It is found that variety of the mass accretion rates and shock cone structures strongly depend on Mach number and adiabatic index of the gas. The shock cones on the accretion disk are important physical mechanisms to trap existing oscillation modes, thereupon these trapped modes may generate strong X-rays observed by different X-ray satellites. Besides, our numerical approach also show that the shock cones produces the flip–flop oscillation around the black holes. The flip–flop instabilities which are monitored in our simulations may explain the erratic spin behavior of the compact objects (the black holes and neutron stars) seen from observed data.

Download Full-text

Influence of viscosity and the adiabatic index on planetary migration

Astronomy and Astrophysics ◽

10.1051/0004-6361/201118490 ◽

2013 ◽

Vol 550 ◽

pp. A52 ◽

Cited By ~ 16

Author(s):

B. Bitsch ◽

A. Boley ◽

W. Kley

Keyword(s):

Adiabatic Index ◽

Planetary Migration

Download Full-text

Adiabatic index of hot and cold compact objects

Brazilian Journal of Physics ◽

10.1590/s0103-97332010000200007 ◽

2010 ◽

Vol 40 (2) ◽

Cited By ~ 6

Author(s):

R. H. Casali ◽

D. P. Menezes

Keyword(s):

Compact Objects ◽

Adiabatic Index

Download Full-text

Observational determination of the adiabatic index in the quiet time plasma sheet

Geophysical Research Letters ◽

10.1029/gl016i006p00563 ◽

1989 ◽

Vol 16 (6) ◽

pp. 563-566 ◽

Cited By ~ 71

Author(s):

C. Y. Huang ◽

C. K. Goertz ◽

L. A. Frank ◽

G. Rostoker

Keyword(s):

Plasma Sheet ◽

Adiabatic Index ◽

Quiet Time

Download Full-text

Some analytic models of plane symmetric radiating collapse

Canadian Journal of Physics ◽

10.1139/cjp-2016-0518 ◽

2017 ◽

Vol 95 (1) ◽

pp. 65-68 ◽

Cited By ~ 1

Author(s):

G. Abbas ◽

Hassan Shah ◽

Zahid Ahmad

Keyword(s):

Thermal Behavior ◽

Analytical Solutions ◽

Adiabatic Index ◽

Junction Conditions ◽

Matter Distribution ◽

Field Equations ◽

Plane Symmetric ◽

Symmetric Source ◽

The Stability ◽

Analytic Models

This paper deals with the analytical solutions of the field equations in the presence of radiating plane symmetric source. For this purpose we have solved the field equations as well as junction conditions by imposing the conformal flatness conditions. The effective adiabatic index (that determines the stability of the system) has been calculated for the present radiating source. It has been found that effective adiabatic index remains invariant throughout the matter distribution. To study the thermal behavior of the source, we have discussed the thermal profile of the source and found that in the absence of dissipation from the system the temperature of the system remains constant.

Download Full-text

DARBOUX CLASS OF COSMOLOGICAL FLUIDS WITH TIME-DEPENDENT ADIABATIC INDICES

Modern Physics Letters A ◽

10.1142/s0217732300000980 ◽

2000 ◽

Vol 15 (15) ◽

pp. 979-990 ◽

Cited By ~ 12

Author(s):

H. C. ROSU

Keyword(s):

Mathematical Method ◽

Cosmological Constant ◽

Time Dependence ◽

Adiabatic Index ◽

Time Dependent ◽

Accelerating Universe ◽

Constant Parameter ◽

Darboux Transformations ◽

Scale Factors ◽

Experimental Findings

A one-parameter family of time-dependent adiabatic indices is introduced for any given type of cosmological fluid of constant adiabatic index by a mathematical method belonging to the class of Darboux transformations. The procedure works for zero cosmological constant at the price of introducing a new constant parameter related to the time dependence of the adiabatic index. These fluids can be the real cosmological fluids that are encountered at cosmological scales and they could be used as a simple and efficient explanation for the recent experimental findings regarding the present day accelerating universe. In addition, new types of cosmological scale factors, corresponding to these fluids, are presented.

Download Full-text

Anisotropic neutron stars by gravitational decoupling

The European Physical Journal C ◽

10.1140/epjc/s10052-019-7341-z ◽

2019 ◽

Vol 79 (10) ◽

Cited By ~ 20

Author(s):

V. A. Torres-Sánchez ◽

E. Contreras

Keyword(s):

Neutron Star ◽

Neutron Stars ◽

Perfect Fluid ◽

Compact Object ◽

Adiabatic Index ◽

X Ray ◽

Binary Pulsar ◽

Stable Solutions ◽

X Ray Binaries ◽

Fluid Configuration

Abstract In this work we obtain an anisotropic neutron star solution by gravitational decoupling starting from a perfect fluid configuration which has been used to model the compact object PSR J0348+0432. Additionally, we consider the same solution to model the Binary Pulsar SAX J1808.4-3658 and X-ray Binaries Her X-1 and Cen X-3 ones. We study the acceptability conditions and obtain that the MGD-deformed solution obey the same physical requirements as its isotropic counterpart. Finally, we conclude that the most stable solutions, according to the adiabatic index and gravitational cracking criterion, are those with the smallest compactness parameters, namely SAX J1808.4-3658 and Her X-1.

Download Full-text