Detailed Information on Publication Record
2019
Stable Schwarzschild stars as black-hole mimickers
KONOPLYA, Roman, Nelson Camilo POSADA AGUIRRE, Zdeněk STUCHLÍK and Olexandr ZHYDENKOBasic information
Original name
Stable Schwarzschild stars as black-hole mimickers
Authors
KONOPLYA, Roman (804 Ukraine, guarantor, belonging to the institution), Nelson Camilo POSADA AGUIRRE (170 Colombia, belonging to the institution), Zdeněk STUCHLÍK (203 Czech Republic, belonging to the institution) and Olexandr ZHYDENKO (804 Ukraine, belonging to the institution)
Edition
Physical Review D, 2019, 2470-0010
Other information
Language
English
Type of outcome
Článek v odborném periodiku
Field of Study
10308 Astronomy
Country of publisher
United States of America
Confidentiality degree
není předmětem státního či obchodního tajemství
References:
RIV identification code
RIV/47813059:19240/19:A0000416
Organization unit
Faculty of Philosophy and Science in Opava
UT WoS
000480609700009
Keywords in English
Schwarzschild star; quasinormal modes; black-hole mimicker; stability
Tags
Tags
International impact, Reviewed
Links
GA19-03950S, research and development project.
Změněno: 21/4/2020 10:28, Ing. Petra Skoumalová
Abstract
V originále
The Schwarzschild star is an ultracompact object beyond the Buchdahl limit, which has Schwarzschild geometry outside its surface and positive pressure in the external layer which vanishes at the surface. Recently, it has been shown that the Schwarzschild star is stable against spherically symmetric perturbations. Here we study arbitrary axial nonspherical perturbations and show that the observable quasinormal modes can be as close to the Schwarzschild limit as one wishes, what makes the Schwarzschild star a very good mimicker of a black hole. The decaying time-domain profiles prove that the Schwarzschild star is stable against nonspherical perturbations as well. Another peculiar feature is the absence of echoes at the end of the ringdown. Instead we observe a nonoscillating mode which might belong to the class of algebraically special modes. At asymptotically late times, Schwarzschildian power-law tails dominate in the signal.