Gauss-Bonnet Stars

• Grant number: 18/20689-7
• Support Opportunities: Scholarships abroad - Research Internship - Post-doctor
• Start date: December 20, 2018
• End date: June 29, 2019
• Field of knowledge: Physical Sciences and Mathematics - Physics
• Principal Investigator: Manuel Máximo Bastos Malheiro de Oliveira
• Grantee: Pedro Henrique Ribeiro da Silva Moraes
• Supervisor: Mariafelicia de Laurentis
• Host Institution: Divisão de Ciências Fundamentais (IEF). Instituto Tecnológico de Aeronáutica (ITA). Ministério da Defesa (Brasil). São José dos Campos , SP, Brazil
• Institution abroad: Università degli Studi di Napoli Frederico II (UNINA), Italy
• Associated to the scholarship: 15/08476-0 - Gravitational waves in f(R,T) theories: polarization states and astrophysical sources, BP.PD

Abstract

The macroscopical properties of neutron stars depend on both the equation of state assumed for nuclear matter and the underlying gravitational theory. In this project I propose the construction of the hydrostatic equilibrium equation for neutron stars in the f(R,G) theory, with R being the Ricci scalar and G the Gauss-Bonnet scalar. For the nuclear matter inside neutron stars I will assume the BSk19, BSk20 and BSk21 equations of state. The approach will be further applied to white dwarfs, described by the equation of state for complete ionized atoms embedded in a relativistic Fermi gas of electrons. The main goal of the project is to check if the equilibrium configurations of neutron stars and white dwarfs in this theory of gravity can predict the existence of massive pulsars and super-Chandrasekhar white dwarfs, getting in touch, in this way, with recent observations.

Scientific publications

(7)

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

MORAES, P. H. R. S.; SAHOO, P. K.. Wormholes in exponential f(R, T) gravity. EUROPEAN PHYSICAL JOURNAL C, v. 79, n. 8, AUG 13 2019. (15/08476-0, 18/20689-7)

LAPOLA, M. M.; MORAES, P. H. R. S.; DE PAULA, W.; JESUS, J. F.; VALENTIM, R.; MALHEIRO, M.. Induced equation of state for the universe epochs constrained by the hubble parameter. CHINESE JOURNAL OF PHYSICS, v. 72, p. 159-175, AUG 2021. (16/09831-0, 15/08476-0, 18/20689-7, 17/05859-0)

CARVALHO, G. A.; MORAES, P. H. R. S.; DOS SANTOS JR, I, S.; GONCALVES, B. S.; MALHEIRO, M.. Hydrostatic equilibrium configurations of neutron stars in a non-minimal geometry-matter coupling theory of gravity. EUROPEAN PHYSICAL JOURNAL C, v. 80, n. 5, MAY 29 2020. (15/08476-0, 18/20689-7, 13/26258-4)

MORAES, P. H. R. S.. The trace of the trace of the energy-momentum tensor-dependent Einstein's field equations. EUROPEAN PHYSICAL JOURNAL C, v. 79, n. 8, AUG 13 2019. (13/26258-4, 15/08476-0, 18/20689-7)

DOS SANTOS, S. I.; CARVALHO, G. A.; MORAES, P. H. R. S.; LENZI, C. H.; MALHEIRO, M.. A conservative energy-momentum tensor in the f(R,T) gravity and its implications for the phenomenology of neutron stars. EUROPEAN PHYSICAL JOURNAL PLUS, v. 134, n. 8, AUG 2019. (15/08476-0, 13/26258-4, 18/20689-7)

MORAES, P. H. R. S.; SAHOO, PRADYUMN KUMAR; KULKARNI, SHREYAS SUNIL; AGARWAL, SHIVAANK. An Exponential Shape Function for Wormholes in Modified Gravity. CHINESE PHYSICS LETTERS, v. 36, n. 12, DEC 2019. (18/20689-7)

ARBANIL, V, JOSE D.; MORAES, PEDRO H. R. S.; MALHEIRO, MANUEL. Gravastar model in Randall?Sundrum braneworld. Classical and Quantum Gravity, v. 36, n. 23, DEC 5 2019. (18/20689-7, 13/26258-4)