Radial oscillations of neutron stars with antikaon condensate

[en] In this article, we study the neutron stars with antikaon condensates and their radial oscillations. We incorporate the antikaons (K-, K¯) within a relativistic mean field theory with density dependent couplings. A transition to the kaon condensed phase is treated as a second order phase transition for different possible antikaon optical potentials. Then, we solve the structure equations of stars and calculate the fundamental and higher order frequencies of their radial pulsations. We study the eigenfunctions of different radial modes for a 2 M⊙ star with equations of state having different potential depths of antikaons. We also study the large frequency separations for the 2 M⊙ star. We find distinct features of the appearances of antikaons on the eigenfunctions. The shape of the eigenfunctions corresponding to the radial perturbations is affected due to the appearance of the antikaons, but for the pressure perturbation, the shape remains unchanged.

Disciplines :

Physics

Author, co-author :

Kheto, Apurba; Government General Degree College, Hooghly, India

Char, Prasanta ; Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO) > Interactions fondamentales en physique et astrophysique (IFPA)

Language :

English

Title :

Radial oscillations of neutron stars with antikaon condensate

Publication date :

September 2023

Journal title :

European Physical Journal. A, Hadrons and Nuclei

ISSN :

1434-6001

eISSN :

1434-601X

Publisher :

Springer Science and Business Media Deutschland GmbH

Volume :

Issue :

Peer reviewed :

Peer Reviewed verified by ORBi

Additional URL :

https://link.springer.com/content/pdf/10.1140/epja/s10050-023-01119-z.pdf

Funders :

F.R.S.-FNRS - Fonds de la Recherche Scientifique

Funding text :

We thank the reviewers for their useful comments that helped us improving the manuscript. We also thank Professor D. Bandyopadhyay for many useful discussions. P. Char is currently supported by the Fonds de la Recherche Scientifique-FNRS, Belgium, under grant No. 4.4501.19.

Available on ORBi :

since 03 December 2024

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