PPGF UNIFAL-MG/UFSJ International Conference on Multimessenger Astrophysics

Contribution List

6. Cálculo analítico e numérico das frequências do campo escalar no buraco negro BTZ

Poster Presentation

Poster Presentation

Neste trabalho consideraremos uma dimensão métrica $2+1$, o buraco negro BTZ (métrica BTZ), considerando a equação de Klein Gordon, que levará em conta a métrica BTZ, usamos um anzat, podemos chegar a uma equação diferencial de $R (r)$, que tem uma forma semelhante à equação de Schrödinger na mecânica quântica. Podemos calcular as frequências dada a equação diferencial em $R(r)$, para isso...

12. Dynamics of Accelerated Waves

Poster Presentation

Poster Presentation

This work aims to study higher-order field equations. To achieve this, starting from the equations of motion of coupled one-dimensional oscillators, we derive a set of fourth-order equations using the method of order-elevation decoupling. In the continuous limit, we identify a fourth-order field equation that generalizes the classical wave equation. This equation can describe waves with...

8. Enhancing Energy Efficiency in Electric Vehicles: The Role of the Torque Converter in Sustainable Mobility

Poster Presentation

Poster Presentation

The article explores the use of torque converters (gearboxes) in electric vehicles to optimize energy efficiency and sustainable mobility. A cargo tricycle was modified to include a 1000 W electric motor and a bicycle gear system. Tests conducted on a 12 km circuit showed that the first gear (higher torque and lower speed) consumed less energy compared to higher gears, which provide lower...

14. Estudo do sistema de suspensão criogênica que comporá novas gerações de interferômetros a laser para observação de ondas gravitacionais

Poster Presentation

Poster Presentation

O Laser Interferometer Gravitational-Wave Observatory (LIGO) é um instrumento projetado para detectar ondas gravitacionais. As detecções do LIGO confirmaram a última previsão restante da Teoria da Relatividade Geral e inauguraram uma nova era da astrofísica de ondas gravitacionais, uma vez que os observatórios de ondas gravitacionais têm o potencial de observar diretamente a história inicial...

19. Field equations of General Relativity via the variational principle

Poster Presentation

Poster Presentation

In the present work we deduce the field equations of General Relativity through the variational principle. By establishing an action $S_{g}$ for the gravitational field and by taking its variation, it is possible to obtain Einstein's field equations in vacuum. Once the vacuum field equations have been deduced, it is possible to conclude that the interaction of matter with the gravitational...

21. From Theory to Reality: A Historical Approach to Detecting Gravitational Waves

Poster Presentation

Poster Presentation

This work aims, through a historical approach, to demonstrate the trajectory of the discovery of gravitational waves predicted by Albert Einstein over a century ago as part of his theory of general relativity.

We are exploring the path that led to the confirmation of these elusive waves, from their initial theoretical indications of existence in the 1910s to the construction of current...

22. Gravitational Waves in the Primordial Universe

Poster Presentation

Poster Presentation

This work aims to study gravitational waves in the primordial universe. Using the
short wave approximation, it is possible to find the propagation equations of gravitational
waves in a curved background. These equations make it possible to find the gravitational
waves emitted in the primordial universe, using the FLRW metric, which is the standard
metric for cosmology studies.

Keywords:...

23. Newtonian Stellar models

Poster Presentation

Poster Presentation

This article will study stellar parameters, based on equations and notions of theoretical physics, demonstrating how it is possible to obtain and understand the Lane-Emden equation, analyzing some aspects in a didactic way.
A Python computational language was used, attached to a numerical resolution method known as Runge-Kutta, with these tools it was possible to build some graphics and a...

7. ONDAS GRAVITACIONAIS EMITIDAS POR SISTEMAS TRIPLOS

Poster Presentation

Poster Presentation

Este trabalho têm como objetivo analisar sistemas triplos hierárquicos com
foco em obter as características das ondas gravitacionais que emitem.
Começamos esta investigação com a definição fundamental de onda
gravitacional e fomos gradativamente conceituando elementos necessários para
abordar o nosso problema específico. Trata-se de uma construção analítica que
incorpora o conhecimento...

18. Preliminary Studies on Black Holes

Poster Presentation

Poster Presentation

The investigation of black holes (BHs) and their properties is a subject exerting considerable attraction among those interested in the universe and its astrophysical content. This context motivated the studies conducted by the authors on black hole physics. Their methodology included a bibliographic review of papers and books addressing the theme pedagogically. We start with a historical...

9. Recurrence Plots in Gravitational Waves emitted by Binary Neutron Star Mergers

Poster Presentation

Poster Presentation

Recurrence analysis is a method for visualizing the dynamics of a system given its time-series. In the case of Binary Neutron Star mergers, we use the simulations of the CoRe Database to identify possible patterns in their recurrence plots so it can be possible to characterize them. If particular patterns are effectively found, then the recurrence analysis can be a complementary tool to...

15. Reused Notebook Batteries: A Sustainable Solution

Poster Presentation

Poster Presentation

This study explores the reuse of notebook battery cells in off-grid, or autonomous, photovoltaic systems, emphasizing the economic and environmental viability of this practice. The selection criterion, based on the cell charge capacity (Ccel ≥ 2000 mAh), has been shown to be robust, enabling the efficient use of these cells in batteries for off-grid systems. The cost analysis compared the...

13. Study of the Inflationary Paradigm

Poster Presentation

Poster Presentation

The General Relativity (GR) presents limitations that have been observed in the power spectrum of the Cosmic Microwave Background (CMB). For instance, there are issues like the horizon problem, flatness problem and superhorizon correlations. In this work we study inflation, a theory proposed as an extension to the standard cosmological scenario to address these issues, which is characterized...

20. Superradiant scattering in Bopp-Podolsky wormholes

Poster Presentation

Poster Presentation

Superradiance is a physical phenomenon involving the amplification of incident electromagnetic radiation through the extraction of energy from a system. This work analyzes the conditions for the occurrence of superradiance in electrically charged, spherical, and static wormholes, using Podolsky's generalized electromagnetic theory. Given a metric representing the wormhole and its electric...

11. The Method Of Detection Of Gravitational Waves By Interferometry And The Method Of Detection Of Neutrinos By Cherenkov Radiation

Poster Presentation

Poster Presentation

The simple Michelson interferometer is used as the basic method for detecting gravitational waves (GW). The arms of the ideal interferometer are hundreds of kilometers long, so it is necessary to implement a Fabry-Perot cavity (FP) to amplify the signal and detect the gravitational wave in a smaller-scale interferometer. The objective with the interferometer is to observe a phase difference in...

16. Using Quantum Espresso to study optical properties of ZnO

Poster Presentation

Poster Presentation

This poster aims to introduce and elucidate the combined use of Density Functional Theory (DFT) and quantum mechanics for investigating the optical properties of metal-oxide semiconductors (MOS). The study of ZnO as a semiconductor experienced significant peaks in 1990 and 2010. In 2010, over 5,000 publications contained ZnO in the title, abstract, or keywords. This occurred because ZnO...