Copyright 2019 Reflux Design
About Me
I am a Mexican physicist specialized in cosmology and large-scale structure. My research focuses in testing General Relativity using large-scale structure probes and in improving cosmological probes that can help us to constrain Dark Energy such as Baryon Acoustic Oscillations (BAO). For the latter, I am part of the Dark Energy Spectroscopic Instrument (DESI) where I work in BAO and also in constraining cosmology by cross-correlating DESI with other surveys.
As a short bio, I was born in Culiacán, Sinaloa, México, where I got my bachelor degree.
During my undergraduate studies I got awarded by a summer research program co-funded by the U.S. embassy in Mexico to conduct at UT-Dallas, where I later on decided to pursue my PhD in physics
with support from the Mexican government through a CONACYT-Scholarship.
At the beginning of my PhD, my work at UT-Dallas was related to Modified Gravity and consistency/inconsitency tests of cosmological datasets.
While investigating both topics, we were able to write several papers.
Additionally, we upgraded the ISiTGR package, which is a software based on CAMB to test deviations from General Relativity using a phenomenological approach.
We made the ISiTGR code publicly available and it is currently integrated into the Core-Cosmology-Library (CCL) used by the LSST-DESC collaboration, and the DESILike code used by DESI.
Currently, I continue my research on Modified Gravity but I am also involved with the BAO analysis and the cosmological parameter estimation team in DESI.
Additionally, I am co-chair of a topical group within DESI, which invest its efforts in cross-correlating DESI with photometric surveys that overlap the DESI footprint to perform 3x2-point analysis.
In 2024, I got an Einstein Fellowship by the NASA Hubble Fellowship Program (NHFP) to continue and extend my research at Harvard University.
Research Involvement
Cosmological Parameter Inference
Cosmological parameters and dark energy constraints using current cosmological data and samplers.
Modified gravity as deviations from general relativity
Modified gravity parameter constraints and model-comparison tests.
Cosmological tensions
Tension metrics and consistency between datasets.
Cosmological forecasts for galaxy clustering
Forecasted errors on galaxy clustering compressed statistics for DESI.
Baryon Acoustic Oscillations (BAO)
Measurements and BAO fits.
Systematics in BAO analysis
Robustness of BAO analysis against Halo Occupation Distribution (HOD) modeling.
Non-parametric methods and agnostic tests of gravity
Model-independent tests for deviations of general relativity at cosmological scales.
Integrated Software in Testing General Relativity (ISiTGR)
ISiTGR developer, currently integrated into the CCL and DESILike.
Dark Energy Spectroscopic Instrument (DESI)
I am a member of DESI collaboration where I have been getting heavily involved since 2020. I have perform cosmological parameter inference, clustering measurements and BAO analysis, among other analyses for the collaboration. .
LSST-Dark Energy Science Collaboration (LSST-DESC)
I am part of the LSST-DESC since 2018. Some of the previous works I did for LSST-DESC are benchmarking for Core-Cosmology-Library (CCL) modified gravity parameters using ISiTGR, and I have contributed to the modified gravity modules for the CCL development. .Publications
Please find my complete list of publications at iNSPIRE HEP or Google Scholar.
Some selected publications below:
- Cristhian Garcia-Quintero, Juan Mena-Fernández, et al. HOD-Dependent Systematics in Emission Line Galaxies for the DESI 2024 BAO analysis, Submitted to JCAP
- Juan Mena-Fernández, Cristhian Garcia-Quintero, et al. HOD-Dependent Systematics for Luminous Red Galaxies in the DESI 2024 BAO Analysis, Submitted to JCAP
- DESI Collaboration DESI 2024 VI: Cosmological Constraints from the Measurements of Baryon Acoustic Oscillations, Submitted to JCAP6
- DESI Collaboration DESI 2024 III: Baryon Acoustic Oscillations from Galaxies and Quasars, Submitted to JCAP
- DESI Collaboration Validation of the Scientific Program for the Dark Energy Spectroscopic Instrument, Astron. J., 167 (2024) 2, 62
- Cristhian Garcia-Quintero, Mustapha Ishak, Orion Ning Current constraints on deviations from General Relativity using binning in redshift and scale, JCAP, 12 (2020) 018
- Cristhian Garcia-Quintero, Mustapha Ishak Singling out modified gravity parameters and data sets reveals a dichotomy between Planck and lensing, Mon. Not. Roy. Astron. Soc., 506 (2021) 2, 1704-1714
- Cristhian Garcia-Quintero, Mustapha Ishak, Logan Fox, Weikang Lin Cosmological discordances. III. More on measure properties, large-scale-structure constraints, the Hubble constant and Planck data, Phys. Rev. D, 100 (2019) 12, 123538
- Cristhian Garcia-Quintero, Mustapha Ishak, Logan Fox, Jason Dossett Testing deviations from GR at cosmological scales including dynamical dark energy, massive neutrinos, functional or binned parametrizations, and spatial curvature, Phys. Rev. D, 100 (2019) 10, 103530
Outreach
I was part of the Astronomy Association of Sinaloa (ASA) in my hometown during my undergraduate studies. I participated in several activities across the state in order to show more about astronomy and space to the general audience. Some nice pictures below!
