On the radial stability of ultra-compact Schwarzschild stars beyond the Buchdahl limit
Identifikátory výsledku
Kód výsledku v IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F47813059%3A19240%2F19%3AA0000555" target="_blank" >RIV/47813059:19240/19:A0000555 - isvavai.cz</a>
Výsledek na webu
<a href="https://iopscience.iop.org/article/10.1088/1361-6382/ab0526" target="_blank" >https://iopscience.iop.org/article/10.1088/1361-6382/ab0526</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1088/1361-6382/ab0526" target="_blank" >10.1088/1361-6382/ab0526</a>
Alternativní jazyky
Jazyk výsledku
angličtina
Název v původním jazyce
On the radial stability of ultra-compact Schwarzschild stars beyond the Buchdahl limit
Popis výsledku v původním jazyce
In this paper we used the theory of adiabatic radial oscillations developed by Chandrasekhar to study the conditions for dynamical stability of constant energy-density stars, or Schwarzschild stars, in the unstudied ultra compact regime beyond the Buchdahl limit, that is, for configurations with radius R in the range R_S < R < (9/8)R_S, where R_S is the Schwarzschild radius of the star. These recently found analytical solutions exhibit a negative pressure region in their centre and, in the limit when R -> R_S, the full interior region of the star becomes filled with negative pressure. Here we present a systematic analysis of the stability of these configurations against radial perturbations. We found that, contrary to the usual expectation found in many classical works, the ultra compact Schwarzschild star is stable against radial oscillations. We computed values of the critical adiabatic index gamma_(c) for several stellar models with varying radius R/R_s and found that it also approaches a finite value as R/R_S -> 1.
Název v anglickém jazyce
On the radial stability of ultra-compact Schwarzschild stars beyond the Buchdahl limit
Popis výsledku anglicky
In this paper we used the theory of adiabatic radial oscillations developed by Chandrasekhar to study the conditions for dynamical stability of constant energy-density stars, or Schwarzschild stars, in the unstudied ultra compact regime beyond the Buchdahl limit, that is, for configurations with radius R in the range R_S < R < (9/8)R_S, where R_S is the Schwarzschild radius of the star. These recently found analytical solutions exhibit a negative pressure region in their centre and, in the limit when R -> R_S, the full interior region of the star becomes filled with negative pressure. Here we present a systematic analysis of the stability of these configurations against radial perturbations. We found that, contrary to the usual expectation found in many classical works, the ultra compact Schwarzschild star is stable against radial oscillations. We computed values of the critical adiabatic index gamma_(c) for several stellar models with varying radius R/R_s and found that it also approaches a finite value as R/R_S -> 1.
Klasifikace
Druh
J<sub>imp</sub> - Článek v periodiku v databázi Web of Science
CEP obor
—
OECD FORD obor
10308 - Astronomy (including astrophysics,space science)
Návaznosti výsledku
Projekt
—
Návaznosti
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Ostatní
Rok uplatnění
2019
Kód důvěrnosti údajů
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Údaje specifické pro druh výsledku
Název periodika
Classical and Quantum Gravity
ISSN
0264-9381
e-ISSN
1361-6382
Svazek periodika
36
Číslo periodika v rámci svazku
6
Stát vydavatele periodika
GB - Spojené království Velké Británie a Severního Irska
Počet stran výsledku
14
Strana od-do
„065004-1“-„065004-14“
Kód UT WoS článku
000459242900001
EID výsledku v databázi Scopus
2-s2.0-85063967047