Loop resummation in de Sitter spacetime with the wavefunction of the universe approach 2024

Advisor: Gonzalo Palma and Spyros Sypsas

This paper extends our previous work by employing the Wavefunction of the Universe approach to compute n-point correlation functions in a single-field inflation model. We show that while WFU coefficients do not exhibit IR divergences, appropriate loop resummation recovers the known results, including both UV and IR divergences.

Regularizing infrared divergences in de Sitter spacetime: loops, dimensional regularization and cutoffs 2024

Advisor: Gonzalo Palma and Spyros Sypsas

Using a single-field inflation model with an arbitrary potential, we compute n-point correlation functions. Considering Witten diagrams up to first order in vertices and arbitrary number of loops, we regularize them using dimensional regularization and Wilsonian approach, showing that no time-dependent terms arise in the correlation functions.

Bogoliubov coefficients in multi-field inflation Present

Advisor: Gonzalo Palma and Claudio Muñoz

Due to particle creation in time-dependent inflation, it is useful to describe a multi-field model using Bogoliubov transformations. The resulting coefficients satisfy a first-order differential system, which we aim to solve analytically. This will enable a complete non-perturbative computation of the primordial power spectrum. I presented my results in CosmoSur VI conference.

Phase transition of higher spin black holes in 2+1-dimensions 2022

Advisor: Alberto Faraggi

Inspired by the BTZ black hole, we use Chern-Simons theory in 2+1 dimensions to study the thermodynamics of black holes in AdS space. We calculate the associated charges and, through numerical methods, demonstrate that these charges undergo phase transitions and exhibit critical points.

Supermassive black hole binary mergers Summer Internship 2022

Advisor: Andrés Escala

Using the RAMSES and RAMSES-RT codes, we performed large-scale simulations of SMBHB merger evolution, considering interactions of BHs with the circumbinary gas disk and AGN feedback. We identify the conditions necessary for the merger to occur, and, in that case, we estimate the time required for the process.

Structures in protoplanetary disks 2021

Advisor: Aníbal Sierra

We study the formation of structures in protoplanetary disks during their early evolution, focusing on the interactions among dust particles of varying sizes and distributions. To do this, we analyze dust dynamics analytically and create computer models of luminosity and optical density to simulate observations with the ALMA observatory.

Summer School on Cosmology ICTP Trieste, Italy

"This school provides an introduction to the current state of research in cosmology and astroparticle physics. It is intended for beginning graduate students, as well as more senior non-expert researchers interested in the field."

Perimeter-SAIFR Journeys into Theoretical Physics Sao Paulo, Brasil

"School aimed at outstanding undergraduates in their last year from all countries in Latin America. It is associated with a partnership between ICTP-SAIFR at IFT-UNESP and the Perimeter Institute for Theoretical Physics."

CosmoSur VI Conference Córdoba, Argentina

International conference where I presented the poster of my internship.

Talks

I have given talks in different universities/activities:

• Institut Astrophysique de Paris - France
• Instituto de Física Teórica - Spain
• Pontificia Universidad Católica de Valparaíso - Chile
• Uinversidad del Bío-Bío - Chile
• Pontificia Universidad Católica - Chile

Others Chile

• Cosmology and Particles Conference - Chillán
• Black Holes, Holography and Beyond School and Workshop- Concepción
• Latin American School and Workshop on Gravity and Holography - Santiago
• Asymptotic symmetries & Holography - Santiago
• Graviticulas - Santiago
• CosmoConce - Concepción
• Topological and Holographic Quantum Matter School - Santiago
• Theory and Observations in Einstein’s Theory of Gravity and its Modifications School - Santiago
• Workshop on Celestial Holography and Asymptotic Symmetries - Santiago
• Advances in Cosmology from the Southern Hemisphere - Valparaíso