First International Latin American Conference on Gravitational Waves: 10 years since first detection

Contribution List

9. Asymptotic Symmetries on Conformal Killing Horizons

Níckolas de Aguiar Alves (Federal University of ABC, Brazil)

Symmetries are ubiquitous in modern physics. They not only allow for a more simplified description of physical systems but also, from a more fundamental perspective, can be seen as determining a theory itself. In the present paper, we propose a new definition of asymptotic symmetries that unifies and generalizes the usual notions of symmetry considered in asymptotically flat spacetimes and...

25. Constraining Modified Gravity with Spectral Sirens and Galaxy Catalogues.

Pedro Bessa (CBPF - Centro Brasileiro de Pesquisas Físicas)

The spectral siren method is a promising new way to constrain cosmological parameters, providing a way to break the redshift degeneracy from cosmic distance measurements obtained from Gravitational Wave observations by using information from the mass distribution of the BBH population. There has been a recent development in MCMC methods to jointly constrain the cosmological and BBH population...

30. Constraining the Dark Energy Equation of State: Forecasts for the Era of Multi-Band Gravitational Wave Cosmology

Sanderson Carlos Ribeiro (Universidade Estadual de Londrina (UEL))

The Dark Energy Equation of State is not a direct observable. Some authors have suggested a connection between the Hubble tension and dynamical dark energy models, $w(z)$, supported by the recent DESI results, e.g., the CPL parameterization. Model-independent reconstructions — implemented with cubic splines, Gaussian processes, etc. — also suggest a dynamical behavior and generally make use of...

3. Continuous Gravitational Waves from Neutron Stars Magnetic Mountains

Pedro Henrique Barboza Rossetto

In this presentation, I will discuss the emission of continuous gravitational waves by neutron star mountains. I will begin with an overview of the different mechanisms for forming neutron star mountains and their role in generating gravitational radiation. The focus then shifts to magnetically confined mountains and the process of magnetic field burial. To explain the model, I will introduce...

38. Cosmological Parameter Estimation with Bright Sirens Using the DALI Method and Next-Generation Observatories

Mayara Hilgert Pacheco (Brazilian National Institute for Space Research)

The Hubble constant is one of the most important cosmological parameters. However, current estimates diverge significantly: local measurements (e.g., SH0ES) suggest $H_0 \approx 73$ km/s/Mpc, while CMB-based results (e.g., Planck) yield $\approx 67$ km/s/Mpc — a tension of $4$–$5\sigma$. Several endeavors have been made to reconcile the two results. One of these attempts is the use of...

22. Cosmological Parameters in Intrinsically Symmetric Models with Linear Perturbations

Mrs Paloma Dias Silva (Universidade Federal de Itajubá - UNIFEI)

This work investigates cosmological parameters in the context of intrinsically symmetric models, a class of solutions in General Relativity that preserve local spatial symmetries while allowing for inhomogeneities and anisotropies. Unlike the standard model based on the FLRW metric, these models naturally include heat flux, anisotropic pressure, and dissipative effects, which can alter...

23. Cryogenic Evaluation of Materials for Vibration Isolation in Next-Generation Gravitational Wave Detectors

Denisson Guimarães do Carmo (University State of São Paulo - Brazil)

Laser Interferometer Gravitational Wave Observatories are instruments designed to detect gravitational waves. The detections made by LIGO confirmed the last remaining prediction of General Relativity and ushered in a new era of gravitational wave astrophysics. In order to improve sensitivity by an additional factor of two and to halve the low-frequency cutoff to 10 Hz, an upgrade to the LIGO...

17. Estudo Sobre a Estrutura Geodésica de um Buraco Negro Regular

Mr José Carlos Martins (UFPI)

Ao realizar um estudo aprofundado da estrutura geodésica de buracos negros regulares, com ênfase no modelo de Sean A. Hayward e na análise geodésica detalhada desenvolvida por Abbas & Sabiullah (2014), constata-se que Hayward propõe uma métrica esfericamente simétrica e estática

$
ds^2 = -F(r)\,dt^2 + \frac{dr^2}{F(r)} + r^2 d\Omega^2, \quad
F(r) = 1 - \frac{2mr^2}{r^3 + 2l^2...

26. Exploring the DALI Approximation in Gravitational Wave Data Analysis

Josiel Mendonça Soares De Souza (UFRJ)

In the next decade, new gravitational-wave detectors (like Einstein Telescope and Cosmic Explorer) will operate with a sensitivity gain of about one order of magnitude compared to current instruments. This improvement will enable the detection of binary black hole coalescences up to redshift z∼10, as well as hundreds of merger events per month. Such capabilities will make these detectors...

11. Feasibility analysis of a cryogenic test-mass suspension with flexures operating in compression for third-generation gravitational wave detectors

Fabián Peña Arellano (California State University at Los Angeles)

This presentation provides an overview on the feasibility analysis of a novel suspension for the cryogenic test-mass mirrors of the low-frequency detector of the Einstein Telescope. To overcome the severe limitation imposed on traditional suspensions by the tensile stress for simultaneously achieving low thermal noise, safer mechanical margins and high thermal conductance, this configuration...

37. Glitches Distributions and Correlations in O3 for the Virgo Observatory

Christian Andrade Bruzigues (Universidade Federal de Alfenas)

This work details a preliminary statistical analysis of non-gaussian noise anomalies, or glitches, within the Virgo observatory's data from the third observational run (O3). The methodology focuses on characterizing these glitches by analyzing their frequencies over time, signal-to-noise ratios (SNR), and frequency ranges to identify correlations and prevalent types. The primary goal is to...

19. Gravitational Wave Data Processing with Open-Source Tools: Glitch Mitigation and Matched Filtering

Pedro Jeronimo Santos da Silva (Universidade Estadual Paulista (Unesp))

The analysis of gravitational wave data requires precise methods for identifying and extracting astrophysical signals from instrumental noise. In this work, we employ open-source tools such as GWpy and PyCBC to process real data from the LIGO–Virgo collaboration. For the GW170817 event, associated with the merger of two neutron stars, we applied the Q-transform for time–frequency...

42. Gravitational Wave Effects in Casimir Cavities

Victor Alencar (Universidade Federal do Rio de Janeiro - Instituto de Física)

We analytically investigate the effects of gravitational waves on the Casimir force between two uncharged metallic plates. The gravitational contribution to the electromagnetic vacuum energy is computed using covariant path integral quantization in a gravitational wave background. Our findings reveal that gravitons are absorbed by the cavity, inducing a repulsive correction to the Casimir...

34. Gravitational Waves in f(R) Gravity for Curved Spacetimes

Regiley Pimenta Ramos De Oliveira (Universidade Federal de Alfenas)

Following the detection of GW150914 by LIGO, General Relativity (GR) has solidified its status as a definitive theory of gravity. However, in certain regimes—particularly at high energies—modifications to the Einstein-Hilbert action have been proposed. Terms such as the Starobinsky correction ($R^2$), as well as higher-order contributions like $R\Box R$, can robustly describe phenomena such as...

31. Higher-order effects in Robinson-Trautman radiation: Gravitational Memory

Prakash Sarnobat (East Surrey Gravity Research)

The Robinson-Trautman metrics represent the simplest scenario that can describe the emission of Gravitational Waves from a bounded source. Lowest-order perturbations of the Schwarzschild metric have been previously investigated by Kramer (1988) and several others, particularly in order to demonstrate that the radiating gravitational field is well-behaved and free of irregularities. But little...

24. INVESTIGATING GRAVITATIONAL WAVES IN CORRESPONDENCE WITH GRB TRIGGERS

Juan Martins

Traditional astronomy has studied cosmic phenomena through electromagnetic radiation, from radio to gamma rays. Modern multimessenger astronomy extends this by including additional cosmic messengers: gravitational waves (GWs), high-energy neutrinos (HENs), and cosmic rays. Each cosmic messenger provides unique insights into extreme astrophysical events such as binary black hole and binary...

36. INVESTIGATING GRAVITATIONAL WAVES IN CORRESPONDENCE WITH NEUTRINO TRIGGERS

Victor Esmite Barroso de Carvalho (INPE)

Multimessenger astronomy has become a key approach in modern astrophysics by combining signals from different messengers, such as gravitational waves (GWs), neutrinos, and electromagnetic radiation, to explore the universe’s most energetic events. This study presents a triggered coherent search for GWs using High-Energy Neutrinos (HENs) detected by the ANTARES and KM3NeT telescopes during the...

40. Investigation of Unknown Lockloss Causes in LIGO O4 Data using Morphological Analysis

Julio César Martins (INPE - National Institute for Space Research)

The Advanced LIGO detectors are highly sensitive instruments designed for detecting gravitational waves. A critical challenge in maximizing detector uptime is the occurrence of "locklosses," which happen when the interferometer loses light resonance in one or more of its optical cavities, resulting in significant downtime required for re-acquisition. While some locklosses are attributed to...

18. Linear Perturbations and SVT Decomposition in Higher-Order Quadratic Gravity

Neil Lizander Goyzueta Palomino (UNESP)

In this work, we present the formulation of linear perturbations in higher-order gravity theories, whose action includes terms $R$, $R^2$, and $R \Box R$. The perturbed metric and the energy-momentum tensor are decomposed into scalar, vector, and tensor modes (SVT decomposition), allowing the independent analysis of each type of perturbation. We consider the gauge invariants $\Phi$, $\Psi$,...

35. NEURAL NETWORKS FOR CORE-COLLAPSE SUPERNOVAE SEARCHES USING SINGLE DETECTOR DATA

Gabriel Marcos Rodrigues Barbosa (Instituto Nacional de Pesquisas Espaciais - INPE)

Gravitational-wave (GW) astronomy has progressed steadily since the first detection of a signal from a binary black-hole coalescence in 2015, and in parallel, machine-learning techniques have become increasingly valuable allies in this field, enabling more effective searches for different signal types and improving characterization of detector noise. Although all confirmed detections to date...

29. New Phenomenology of Gravitational Waves Described by Symmetric Teleparallel Gravitation (STG)

Vincius Bonavides de Castro Campos (Instituto Tecnológico de Aeronáutica (ITA))

General Relativity (GR) has been consolidated as the most successful theory to describe gravitation, having been confirmed by numerous experiments, most notably the direct detection of gravitational waves. However, GR presents limitations in different regimes: on cosmological scales, dark matter and dark energy are invoked to explain observational phenomena; on microscopic scales, the absence...

14. New results on the sky localization and polarization mode reconstruction of gravitational waves

Osvaldo Mario Moreschi (Facultad de Matemática Astronomía Física y Computación (FaMAF))

We report new developments in the L2D+GWPM procedure
for sky localization using two detectors and gravitational-wave
polarization modes measurement.
We review the new findings presented in
https://doi.org/10.1007/s10509-025-04465-0,
where we report the first direct measurement
of spin-2 gravitational-wave polarization modes.
We present validation of the procedure using injected...

41. Non-radial f-mode of strange quark stars based on the vector MIT bag model

Gabriel Cavalheiro (Instituto Tecnológico de Aeronáutica (ITA))

The detection of gravitational waves (GWs) by detectors such as LIGO has opened a new path for the observation of astrophysical objects [1].
In this context, we highlight compact stars as a source of GWs via their pulsation modes, in particular the non-radial f-mode which is very sensitive to the equation of state (EoS) of the star, which is composed of ultra-dense matter [2]. This means that...

33. On the phase transition mechanism of spontaneous scalarization

João Vitor Motta Muniz (Universidade Federal Fluminense (UFF))

As electromagnetic and gravitational-wave observations expand our ability to study compact objects such as black holes and neutron stars, considerable effort has been devoted to testing general relativity and its alternatives in the strong-field regime that characterizes their vicinities. A paradigmatic phenomenon in this context is the scalarization effect, in which the scalar field present...

27. Ondas gravitacionais na teoria de Brans-Dicke

Djalma Guterres

A análise dos modos de polarização presentes no sinal de ondas gravitacionais permite testar extensões da RG Este trabalho investiga ondas gravitacionais emitidas por sistemas binários de objetos compactos no contexto da teoria de Brans-Dicke(BD). Por meio da decomposição por helicidade da perturbação métrica, podemos obter três tipos de quantidades invariantes de calibre: escalares, vetoriais...

39. Perturbations of accelerated black holes

Dr Rodrigo Fontana (UFRGS)

We present some recent results obtained in the perturbation theory of black holes considering accelerated geometries. We studied black holes with and without charge and cosmological constant demonstrating in most of the cases the dynamical stability to first order scalar perturbation. We inspect the relation between scalar perturbations and the breakdown of the strong cosmic censorship...

6. Plane wave solutions in Lorentz-violating extensions of gravity

Albert Petrov (UFPB)

In this communication, we consider various Lorentz-violating (LV) extensions of gravity. For the LV extensions of gravity proposed in the paper by Kostelecky and Li (Phys. Rev. D103 (2021), 024059), we explicitly obtain dispersion relations for plane gravitational waves and demonstrate that these relations describe a Lorentz-invariant mode propagating with the speed of light. Afterward, we...

21. Poster: Uma perspectiva numérica para a evolução do contraste de densidade em modelos cosmológicos intrinsecamente homogêneos e isotrópicos

BRIAN JOHN GUTIERREZ VILCA (UNIFEI)

Do ponto de vista teórico, modelos inomogêneos são frequentemente considerados na literatura, e a hipótese de que representariam um arcabouço mais preciso para a descrição dos eventos cosmológicos, em contrapartida aos espaços-tempos FLRW, é bastante discutida. Neste trabalho, consideraremos uma subclasse específica desses, que é aquela onde a expansão do universo pode ser considerada...

8. Primordial Gravitational Waves and Cosmic Signatures of New Physics

Martin Dionisio Arteaga Tupia

Recent advances in gravitational wave (GW) astronomy have opened a new observational window to probe early-universe physics and scenarios beyond the Standard Model (BSM). In particular, scale-invariant models with dynamical symmetry breaking predict strong first-order phase transitions (FOPT) in the early universe, which can generate stochastic backgrounds of GWs detectable by future...

28. Primordial Gravitational Waves from a Two Fluid Quantum Bouncing Model

Luiz Felipe Demétrio (demetrio.luizfelipe.fis@gmail.com)

The last decade saw huge progress in gravitational wave astronomy. The recent observed signals — from LIGO to NanoGrav — have opened a new window with rich information regarding our universe, while also allowing to test and constrain cosmological models. In this context, we analyze the production of Primordial Gravitational Waves (PGW's) from the vacuum fluctuations of a pre-Big Bang...

15. Probing dark matter with gravitational-wave detectors

Andrew Miller (Nikhef / Utrecht University)

Dark matter could compose ~80% of all matter in the universe, and yet it is completely invisible to us. Despite decades of experiments designed to detect dark matter, and numerous models for potential dark matter particles, no concrete evidence has been put forward to support the existence of beyond standard-model physics. Because of this, it is worth asking whether approaching the detection...

20. Pulsar Timing as a probe of the theory of gravity

Márcio Alves (UNESP)

Determining the polarization modes of gravitational waves (GWs) and their dispersion relations is decisive in scrutinizing the viability of extended theories of gravity. Here, we use the Bardeen formalism to describe the six possible polarization modes of GWs, and we adopt generic dispersion relations for the modes. Then, we apply the formalism to General Relativity, scalar-tensor theories,...

1. Sessão de Poster

13. Soluções de campos escalares em ondas gravitacionais

Luis Fernando de Paula Medaglia Filho (UFSC)

A equação de Klein-Gordon-Fock (KGF) em espaços-tempo curvos fornece insights cruciais sobre as interações entre matéria e geometria dinâmica. Em ondas gravitacionais, soluções analíticas revelam fenômenos curiosos: Gibbons (1975) demonstrou que ondas planas exatas preservam simetrias de Killing, suprimindo completamente a produção de partículas do vácuo. Duas décadas depois, Garriga &...

10. Systematic analysis of dark standard siren cosmology with LIGO/Virgo/KAGRA during the O4 and O5 observing runs

Viviane Alfradique (CBPF)

The enhanced sensitivity achieved by the LIGO-Virgo-KAGRA (LVK) collaboration has significantly increased the number of gravitational wave (GW) detections, along with improvements in sky localization and luminosity distance estimation. These advances enable the use of dark standard sirens as tools for cosmological probing. Dark sirens are GW events without the identification of an...

4. Testing general relativity using binary black hole orbital frequency evolution on time-frequency plane

Debtroy Das

The orbital evolution of binary black hole (BBH) systems is determined by the component masses and spins of the black holes and the governing gravity theory. General relativity (GR) is the simplest theory of gravity that lays the foundation for successfully explaining the current gravitational wave (GW) observations. We present a method of stacking up the time-frequency pixel energies through...

7. Tracking Glitches Over Time Using t-SNE in LIGO Data

Tabata Aira Ferreira (LSU)

This work presents an analysis of the main glitch groups observed in the LIGO observatories during the O4a observing run. Glitches are non-Gaussian noise transients that can obscure or mimic astrophysical signals in gravitational-wave data. Understanding their origin is essential for improving data quality and detector performance. To this end, we use spectrogram representations of these...

2. VSL-Gravity in light of PSR B1913+16 Full Data Set: Upper limits on graviton mass and its theoretical consequences

Dr Alexander Bonilla Rivera (UFF)

Very Special Linear Gravity (VSL-Gravity) is an alternative model of linearized gravity that incorporates massive gravitons while retaining only two physical degrees of freedom thanks to gauge invariance. Recently, the gravitational period-decay dynamics of the model has been determined using effective field theory techniques. In this study, we conduct a comprehensive Bayesian analysis of the...

12. What Host Galaxies Tell Us About the Evolution of Binary Compact Objects

Maria Celeste Artale (Universidad Andres Bello)

Gravitational wave (GW) events have raised important and challenging questions for models of stellar and binary evolution. While diverse results have provided valuable insights into the formation of compact binaries, a complementary approach is to investigate the properties of the host galaxies where these events are more likely to occur. This perspective can help us constrain formation...