Banca de DEFESA: CLARICY MARIA PAIVA XAVIER

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : CLARICY MARIA PAIVA XAVIER
DATE: 24/02/2026
TIME: 16:00
LOCAL: sala virtual
TITLE:

Pulsars: a proposed analytical modeling approach for the Braking Index

KEY WORDS:

Braking Index, pulsars, Classical Field Theory, ATNF.

PAGES: 90
BIG AREA: Ciências Exatas e da Terra
AREA: Física
SUMMARY:

We can study the Braking Index parameter of a pulsar from classical electrodynamics, using the magnetic dipole model, which states that the deceleration of a pulsar is due to the emission of electromagnetic radiation. According to the standard theoretical framework, the braking index is required to take on a fixed value equal to three. However, several pulsar observations have revealed values different from the expected one, causing a discrepancy with theoretical models and motivating the search for other phenomena and modeling techniques capable of describing these behaviors. In this context, the main purpose of this research is to study a new modeling of the Braking Index, applying well-known techniques from classical field theory to the equation for the pulsar’s braking rate. By applying these techniques, we assume that the angular velocity of the pulsar can be obtained from the solution of a first-order differential equation. These techniques are similar to mechanisms used to describe defect-type solutions in classical fields, which can be applied, for example, to the description of soliton solutions, and are capable of simulating or modifying the propagation of gravitational waves in alternative theories to General Relativity, such as Horndeski theory. With this new modeling, we aim to map the evolution of different types of braking index, generalizing the classes of models known so far. As future perspectives, we intend to investigate the possible physical processes that result in the deceleration of a pulsar. To complement this research, we will use observational data from the ATNF (Australia Telescope National Facility) catalog, for which we have produced a manual to assist other researchers who wish to use it in their studies.

COMMITTEE MEMBERS:
Externa à Instituição - ANA RAFAELY MEDEIROS DE OLIVEIRA
Interno - 1459079 - FRANCISCO DE ASSIS DE BRITO
Presidente - 2136012 - JOAO RAFAEL LUCIO DOS SANTOS
Externo à Instituição - LÁZARO LIMA DE SALES