2024
Energetics of Buchdahl stars and the magnetic Penrose process
SHAYMATOV, Sanjar; Naresh DADHICH and Arman TURSUNOVBasic information
Original name
Energetics of Buchdahl stars and the magnetic Penrose process
Authors
SHAYMATOV, Sanjar; Naresh DADHICH (356 India) and Arman TURSUNOV (860 Uzbekistan, belonging to the institution)
Edition
European Physical Journal C, New York (USA), SPRINGER, 2024, 1434-6044
Other information
Language
English
Type of outcome
Article in a journal
Field of Study
10308 Astronomy
Country of publisher
United States of America
Confidentiality degree
is not subject to a state or trade secret
References:
Impact factor
Impact factor: 4.800
RIV identification code
RIV/47813059:19630/24:A0000352
Organization unit
Institute of physics in Opava
UT WoS
001330673600001
EID Scopus
2-s2.0-85206218185
Keywords in English
results VII polarization;rotating black hole;energy extraction;electromagnetic field;quadrupole moments;horizon;particles
Tags
Tags
International impact, Reviewed
Links
GA23-07043S, research and development project.
Changed: 4/2/2025 13:13, Mgr. Pavlína Jalůvková
Abstract
In the original language
Buchdahl star is the most compact object without an event horizon and is an excellent candidate for a black hole mimicker. Unlike black holes, rotating Buchdahl star can beover-extremal with respect to the black hole, sustaining a larger spin. We show that it can also develop an ergosphere above the threshold spin beta > 1/root 2, which allows extractionof its rotational energy. Electromagnetic field around Buch-dahl star is also expected to differ from that of black hole in both strength and topology. In this paper, we explore the energetics of Buchdahl star focusing on the magnetic Pen-rose process in the two magnetic field configurations, i.e.,uniform and dipole. Below the threshold spin, Buchdahl staris expected to be quiet, while above the threshold it can be much more efficient than the black hole if a dipolar magnetic field is developed on its surface