General Relativistic Surface Degrees of Freedom in Perturbed Hybrid Stars

Autor(es)

Pereira, Jonas P. ^{[1, 2]} ; Lugones, German ^[1]

Afiliação do(s) autor(es)

^[1] Univ Fed ABC, Ctr Ciencias Nat & Humanas, Ave Estados, 5001 Bangu, BR-09210170 Santo Andre, SP - Brazil

^[2] Univ Southampton, Math Sci & STAG Res Ctr, Southampton SO17 1BJ, Hants - England

• Tipo de documento: Artigo Científico
• Fonte: ASTROPHYSICAL JOURNAL; v. 871, n. 1 JAN 20 2019.
• Citações Web of Science: 1

Resumo

We study how the nature of a hybrid star (perfect fluid, solid, or a mixture of them) could be related to the induction of general relativistic surface degrees of freedom on phase-splitting surfaces upon perturbation of its phases. We work in the scope of phase conversions in the vicinities of sharp phase transition surfaces whose timescales are either much smaller (rapid conversions) or larger (slow conversions) than those of the perturbations (omega(-1), where omega is a characteristic frequency of oscillation of the star). In this first approach, perturbations are assumed to be purely radial. We show that surface degrees of freedom could emerge when either the core or the crust of a hybrid star is solid and phase conversions close to a phase-splitting surface are rapid. We also show how this would change the usual stability rule for solid hybrid stars, namely partial derivative M-0/partial derivative rho(c) >= 0, where M-0 is the total mass to the background hybrid star and rho(c) is its central density. Further consequences of our analysis for asteroseismology are also briefly discussed. (AU)

• Processo FAPESP: 15/04174-9 - Algumas consequências da microfísica de volumes e superfícies em sistemas compactos
• Beneficiário: Jonas Pedro Pereira
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 17/21384-2 - Asterosismologia de oscilações quase periódicas e restrições a modelos de estrelas de nêutrons híbridas
• Beneficiário: Jonas Pedro Pereira
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Pós-Doutorado