lectrically charged supermassive twin star

Author(s)

Goncalves, Victor P. ^[1] ; Lazzari, Lucas ^[1] ; Jimenez, Jose C. ^[2]

Affiliation

^[1] Univ Fed Pelotas UFPel, Inst Fis & Matemat, High & Medium Energy Grp, Caixa Postal 354, BR-96010900 Pelotas, RS - Brazil

^[2] Univ Sao Paulo, Inst Fis, Rua Matao 1371, BR-05508090 Butanta, SP - Brazil

• Document type: Journal article
• Source: EUROPEAN PHYSICAL JOURNAL C; v. 82, n. 2 FEB 2022.
• Web of Science Citations: 0

Abstract

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 2 M-circle dot constraint from PSR J0740+6620 is surpassed for standard values of electric charge and can be considered stable only satisfying partial derivative M/partial derivative is an element of(0) > 0. In particular, our charged stellar models reach masses even higher than the unknown compact object measured in the GW190814 event. (AU)

• FAPESP's process: 20/07791-7 - Hydrodynamics for the Beam Energy Scan: 3+1 viscous hydrodynamics with baryon diffusion
• Grantee: José Carlos Jiménez Apaza
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 18/24720-6 - Exploring the QCD phase diagram
• Grantee: Frédérique Marie Brigitte Sylvie Grassi
• Support Opportunities: Research Projects - Thematic Grants