Josiel Mendonça Soares de Souza

About Me

I am a Postdoctoral Fellow in Physics at the Núcleo Cosmo-UFES & PPGCosmo, Universidade Federal do Espírito Santo (UFES), Brazil, funded by FAPES since 2025. I received my Ph.D. in Physics in 2023 from the Universidade Federal do Rio Grande do Norte (UFRN), with a specialization in Gravitation and Cosmology and a focus on Gravitational Waves.

I am a member of the Einstein Telescope Observational Science Board (ET-OSB) and the Brazilian Einstein Telescope Synergy (BETS), and I collaborate on gravitational-wave research with the Brazilian Center for Physical Research (CBPF) and the National Institute for Space Research (INPE).

My research interests lie in Cosmology and the Astrophysics of Gravitational Waves, with a strong emphasis on numerical modeling, data analysis, and parameter estimation. I have extensive experience in Python and C programming, high-performance computing (HPC), and large-scale numerical simulations. I am the developer of GWDALI, an open-source Python package available on PyPI, which implements the Derivative Approximation for Likelihoods (DALI) method for parameter estimation of gravitational-wave sources..

Affiliation

Position	Postdoctoral Fellow (FAPES)
Institution	Universidade Federal do Espírito Santo (UFES)
Group	Núcleo Cosmo-UFES & PPGCosmo
Location	Vitória, ES, Brazil
Email	josiel.souza@ufes.br

Research Interests

Cosmology with Gravitational Waves (Standard & Dark Sirens)
Parameter Estimation beyond the Gaussian (Fisher) Approximation
Derivative Approximation for Likelihoods (DALI)
Third-Generation Gravitational Wave Detectors (Einstein Telescope, Cosmic Explorer)
Numerical Modeling, HPC & Large-Scale Simulations
Late-Time Cosmology & Hubble Tension

Research Groups & Memberships

Einstein Telescope Observational Science Board (ET-OSB)

Member since June 2022. Active in Div. 1 (Fundamental Physics), Div. 2 (Cosmology), and Div. 9 (Common Tools).

Brazilian Einstein Telescope Synergy (BETS)

Member since January 2024. Contributing with improvements on the DALI approximation for Gravitational Wave Data Analysis and Cosmology.

Selected Publications

[2026] Souza, J. M. S. and Miguel Quartin. On the use of the Derivative Approximation for Likelihoods for gravitational wave inference. JCAP 05 (2026), p. 101. doi:10.1088/1475-7516/2026/05/101

[2026] Adrian Abac et al. The Science of the Einstein Telescope. JCAP 03 (2026), p. 081. doi:10.1088/1475-7516/2026/03/081

[2023] Souza, J. M. S. and Riccardo Sturani. GWDALI: A Fisher-matrix based software for gravitational wave parameter-estimation beyond Gaussian approximation. Astron. Comput. 45 (2023), p. 100759. doi:10.1016/j.ascom.2023.100759

[2023] Souza, J. M. S. and Riccardo Sturani. Luminosity distance uncertainties from gravitational wave detections of binary neutron stars by third generation observatories. Phys. Rev. D 108.4 (2023), p. 043027. doi:10.1103/PhysRevD.108.043027

→ Full list of publications