Detailed Information on Publication Record
2022
New interior model of neutron stars
POSADA AGUIRRE, Nelson Camilo, Jan HLADÍK and Zdeněk STUCHLÍKBasic information
Original name
New interior model of neutron stars
Authors
POSADA AGUIRRE, Nelson Camilo (170 Colombia, belonging to the institution), Jan HLADÍK (203 Czech Republic, belonging to the institution) and Zdeněk STUCHLÍK (203 Czech Republic, belonging to the institution)
Edition
Physical Review D, 2022, 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/47813059:19630/22:A0000205
Organization unit
Institute of physics in Opava
UT WoS
000807653700009
Keywords in English
neutron stars;Tolman VII solution; tidal Love number;tidal deformability
Tags
International impact, Reviewed
Změněno: 7/3/2023 13:54, Mgr. Pavlína Jalůvková
Abstract
V originále
The Tolman VII solution is considered by some as one of the few analytical solutions to Einstein???s equations, which describes approximately well the interior of neutron stars (NSs). This solution is characterized by the mass M, radius R, and an energy density that varies quadratically with the radial coordinate r. Recently, Jiang and Yagi proposed a modification of this solution, the so-called modified Tolman VII (MTVII) solution, by introducing an additional quartic term to the energy density radial profile. The MTVII solution is an approximate solution to Einstein???s equation, which includes a new parameter ?? that allows the solution to have a better agreement with the energy density profiles for realistic NSs. Here we consider the MTVII solution, showing that for certain values of the parameter ?? and compactness C this solution manifests a region of negative pressure near the surface which leads to negative values of the tidal Love number. To alleviate these drawbacks, we introduce an exact version of the MTVII solution obtained by solving numerically Einstein???s equations for the MTVII energy density profile. As an application of our new exact MTVII (EMTVII) solution, we calculate the tidal Love number and tidal deformability, as a function of C, for different values of the parameter ??. We find that the EMTVII solution predicts a positive tidal Love number for the whole range of allowed values of parameters ??C; ????, in agreement with previous results for realistic NSs.