Regular Article - Theoretical Physics
Electrically charged supermassive twin stars
High and Medium Energy Group, Instituto de Física e Matemática, Universidade Federal de Pelotas (UFPel), Caixa Postal 354, 96010-900, Pelotas, RS, Brazil
2 Instituto de Física, Universidade de São Paulo (USP), Rua do Matão, 1371, 05508-090, Butantã, SP, Brazil
Accepted: 26 January 2022
Published online: 4 February 2022
By assuming that ultra dense hybrid neutron stars are endowed with a distribution of electric charge, we study the corresponding twin star solutions and their properties resulting from a sharp first order transition from confined hadronic to a deconfined quark phase. Two distinct quark matter equations of state with increasing stiffness are considered and the values for the maximum gravitational masses of the hadronic and hybrid twin configurations are obtained for different values of the total electric charge. Interestingly, our calculations indicate that sharp transitions make charged twin hybrid stars more massive than their neutral counterparts, and that the constraint from PSR J0740+6620 is surpassed for standard values of electric charge and can be considered stable only satisfying . In particular, our charged stellar models reach masses even higher than the unknown compact object measured in the GW190814 event.
© The Author(s) 2022
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