Posts by Collection

portfolio

publications

Approximate metric for a rotating deformed mass

Published in International Journal of Astronomy and Astrophysics, 2015

The Kerr metric presents complications when trying to match it to a real physical interior solution. As a mathematical exercise we generated a ‘squashed’ Kerr-like metric that in principle should be easier to match with a physical interior.

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Slowly rotating curzon-chazy metric

Published in Revista de Matemática: Teoría y Aplicaciones, 2015

We added slow rotation to the Chazy-Curzon metric, which is capable of describing a non-point like object. This slowly rotating metric is also a Kerr-like metric.

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Impact of inhomogeneous reionization in the Lyman-alpha forest

Published in Monthly Notices of the Royal Astronomical Society, 2019

We study the impact of patchy reionization in the Lyman-alpha forest. We find a considerably strong effect in the 3D Lya forest power spectra even at low redshifts (z = 2). Also, we analyzed the possibility of using the quadrupole of the 21cm power spectra to mitigate this signal.

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Detecting Magnetic Fields in Exoplanets with Spectropolarimetry of the Helium Line at 1083 nm

Published in The Astrophysical Journal, 2020

We proposed a new method for detecting magnetic fields in exoplanets based on existing methods used by the solar physics community. The method in question is based on the meta-stable He 1083 nm transition line. We show that in the conditions in the escaping atmospheres of close-in exoplanets, metastable helium atoms should be optically pumped by the starlight, and depending of the strenght of the magnetic field, they should align with the magnetic field. This results in linearly polarized absorption at 1083 nm that traces the field direction.

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talks

Lyman-alpha forest power spectrum as an emerging window into the epoch of reionization and cosmic dawn

Published:

The memory of reionization in the Lya forest was recently shown to survive to lower redshifts than previously thought (z~2). This unconventional result originated from carefully tracking the small-scale structure to below jean mass prior to reionization with high-resolution simulations. As a result, one is able to track the HEMD (High-Entropy, Mean-Density) gas in mini-voids, which takes cosmological timescales to relax into the usual-temperature density relation of the IGM. Here, I will show how the memory of inhomogeneous reionization in the Lya forest power spectra — currently a broadband systematic effect for the Lya forest community- could potentially become a window into the Epoch of Reionization.

Lyman-alpha forest power spectrum as an emerging window into the epoch of reionization and cosmic dawn

Published:

During cosmic reionization, the IGM is heated by ultraviolet photons sourced primarily by the first stars and galaxies. This extreme heating leaves an imprint in the IGM via disrupting the neutral gas with the injection of thermal energy. The thermal relics, i.e. the disruption to the temperature-density evolution of the IGM due to this imprint, has been recently shown to survive to lower redshifts than previously thought (z~2). In this talk, I will demonstrate that these thermal relics depend on the astrophysics of reionization, thus they can, theoretically, be used to distinguish between different reionization histories. In the second part of the talk, I will show how these thermal relics in the Lyman-alpha forest power spectrum — currently a broadband systematic effect for the Lyman-alpha community —could potentially become a novel window into the epoch of reionization.

Searching the Cosmos: Ripples from Avant-Garde Cosmological Probes

Published:

I will give a brief overview of my research in the field of cosmology. In particular, I will talk very briefly about my research in Primordial Black Holes as dark matter candidates. Furthermore, I will talk about mu current research program on the thermal fossils from hydrogen reionization, and how their ripples from 12.8 billion years ago can help us learn more about how the Universe transitions from mainly neutral to highly ionized. In addition, I will mention the interesting open questions that require further investigation.

teaching

Teaching Assistant, Physics III

Undergraduate course for physics majors, University of Costa Rica, Department of Physics, 2010

Physics III: E&M, Optics, and Modern Physics. For physics majors in their sophomore year. Instructor: Prof. Rodrigo Carboni.

Teaching Assistant, Mathematical Methods for Physicists III

Undergraduate course, University of Costa Rica, Department of Physics, 2012

Mathematical Methods for Physicists III: Differential forms, Green functions, and special functions. For physics majors in their junior year. Instructor: Prof. Francisco Frutos.

Teaching Assistant, Electromagnetism I

Undergraduate course, University of Costa Rica, Department of Physics, 2013

Electromagnetism I: Electrostatics. For physics majors in their senior year. Instructor: Prof. Marcela Hernandez.

Lecturer, Physics II

Undergraduate course, University of Costa Rica, Department of Physics, 2013

Physics II: Electrostatics, Thermodynamics, and Waves. Primarily for engineer majors in their sophomore year.

Teaching Assistant, Physics 2300 & 2301

Undergraduate course, The Ohio State University, Department of Physics, 2014

Physics 2300 & 2301: Intermediate mechanics. For physics majors in their sophomre year. Instructor: Prof. Gregory Kilcup.

Graduate Teaching Assistant, Physics 1251

Undergraduate course, The Ohio State University, Department of Physics, 2015

Physics 1251: Electromagnetism, optics, waves, and modern physics. Mainly for engineer majors.