Rodrigo Calderón

I am currently a postdoctoral researcher in the Central European Institute of Cosmology (CEICO) at the Institute of Physics of the Czech Academy of Science (FZU). My research focuses on the phenomenology of models beyond the standard $\Lambda\rm CDM$ paradigm. I am particularly interested in developping and applying advanced statistical methods to Large Scale Structure data from ongoing and upcoming surveys such as DESI, Euclid & LSST, with the main goal of constraining the physics of the early Universe, the dark sector and modified theories of Gravity.

Interests

My research interests lie at the intersection between theory and observations. I primarily focus on testing the underlying pillars of the standard model of Cosmology using various observational probes. I am particularly interested in the use of advanced statistical techniques to test the consistency of the current measurements, and/or to look for possible hints of new physics.

I have been an active member of the Dark Energy Spectroscopic Instrument (DESI), Vera C. Rubin (former LSST) Dark Energy Science (DESC), and Einstein Telescope Collaborations.

Experience

Education

Skills

Programming: Python, Wolfram Alpha (Mathematica), C++/C, $\LaTeX{}$

Scientific Softwares & Packages: $\texttt{MontePython/Cobaya/emcee}$, etc.

Boltzmann Solvers: $\texttt{(hi)CLASS/(MG)CAMB}$

• Spanish, Native.
• French, Native.
• English, Full Professional Working Proficiency.
• Portugues, Intermediate.
• Italian, Basics.

• Music: Guitar, Piano, Ukulele & Harmonica.
• Abstract Thinking.
• Cooking.

Teaching & Outreach

Publication List

An updated list of publications can also be found here

Submitted

• Constraining GREA, an alternative theory accounting for the present cosmic acceleration

  Rodrigo Calderón, J. Garcia-Bellido et al. - DESI Collaboration - Submitted to JCAP - 2025

• NANCY: Next-generation All-sky Near infrared Community surveY.

  J.J. Han et al (including R. Calderón) - Submitted to the Bulletin of the AAS - 2023

Refereed

• Impact of ACT DR6 and DESI DR2 for Early Dark Energy and the Hubble tension

  V. Poulin, T. L. Smith, R. Calderón, T. Simon - Phys. Rev. D 113 (2026) 6, 063519

• Primordial Features in light of the Effective Field Theory of Large Scale Structure

  Rodrigo Calderón, Théo Simon, Arman Shafieloo and Dhiraj K. Hazra - JCAP 01 (2026) 057

• Cosmological implications of DESI DR2 BAO measurements in light of the latest ACT DR6 CMB data

  C. Garcia-Quintero et al. - DESI Collaboration (including R. Calderón) - Phys. Rev. D 112 (2025) 8, 083529

• Extended Dark Energy analysis using DESI DR2 BAO measurements

  K. Lodha, R. Calderón et al. - DESI Collaboration - Phys. Rev. D 112 (2025) 8, 083511 [ Editor's Suggestion]

• Validation of the DESI DR2 Measurements of Baryon Acoustic Oscillations from Galaxies and Quasars

  U. Andrade et al. - DESI Collaboration (including R. Calderón) - Phys. Rev. D 112 (2025) 8, 083512

• Constraints on Neutrino Physics from DESI DR2 BAO and DR1 Full Shape

  W. Elbers et al. - DESI Collaboration (including R. Calderón) - Phys. Rev. D 112 (2025) 8, 083513

• DESI DR2 Results II: Measurements of Baryon Acoustic Oscillations and Cosmological Constraints

  DESI Collaboration (including R. Calderón) - Phys. Rev. D 112 (2025) 8, 083515

• DESI DR2 Results I: Baryon Acoustic Oscillations from the Lyman Alpha Forest

  DESI Collaboration (including R. Calderón) - Phys. Rev. D 112 (2025) 083514

• Modified Gravity Constraints from the Full Shape Modeling of Clustering Measurements from DESI 2024

  M. Ishak, J. Pan, R. Calderón, K. Lodha et al. (DESI Collaboration) - JCAP 09 (2025) 053

• DESI 2024 V: Full-Shape Galaxy Clustering from Galaxies and Quasars.

  DESI Collaboration (including R. Calderón) - JCAP 09 (2025) 008

• DESI 2024 VII: Cosmological Constraints from the Full-Shape Modeling of Clustering Measurements.

  DESI Collaboration (including R. Calderón) - JCAP 07 (2025) 028

• DESI 2024 II: Sample Definitions, Characteristics, and Two-point Clustering Statistics.

  DESI Collaboration (including R. Calderón) - JCAP 07 (2025) 017

• Model-independent cosmology with joint gravitational wave observations and $\gamma$-ray bursts.

  A. Cozzumbo, U. Dupletsa, R. Calderón, R. Murgia, G. Oganesyan, M. Branchesi - JCAP 05 (2025) 021

• On the implication of the `cosmic calibration tension' beyond $H_0$ and the synergy between early- and late-time new physics.

  V. Poulin, T. L. Smith, R. Calderón, T. Simon - Phys. Rev. D 111 (2025) 083552 [ Editor's Suggestion]

• DESI 2024 III: Baryon Acoustic Oscillations from Galaxies and Quasars.

  DESI Collaboration (including R. Calderón) - JCAP 04 (2025) 012

• DESI 2024 VI: Cosmological Constraints from the Measurements of Baryon Acoustic Oscillations.

  DESI Collaboration (including R. Calderón) - JCAP 02 (2025) 021

• DESI 2024 IV: Baryon Acoustic Oscillations from the Lyman Alpha Forest.

  DESI Collaboration (including R. Calderón) - JCAP 01 (2025) 124

• DESI 2024: Constraints on physics-focused aspects of dark energy using DESI DR1 BAO data.

  DESI Collaboration: K. Lodha, A. Shafieloo, R. Calderón, E. V. Linder et al - Phys. Rev. D 111 (2025) 2, 023532

• DESI 2024: Reconstructing Dark Energy using Crossing Statistics with DESI DR1 BAO data.

  DESI Collaboration: R. Calderón, K. Lodha, A. Shafieloo, E. V. Linder et al - JCAP 2410 (2024) 048

• On the consistency of $\Lambda\rm CDM$ with CMB measurements in light of the latest Planck, ACT, and SPT data.

  Rodrigo Calderón, Arman Shafieloo, Dhiraj K. Hazra and Wuhyun Sohn - JCAP08 (2023) 059

• Joint Reconstructions of Growth and Expansion Histories from Stage IV surveys with Minimal Assumptions. II. Modified Gravity and Massive Neutrinos.

  R. Calderón, B. L'Huillier, D. Polarski, A. Shafieloo and A. A. Starobinsky - Phys. Rev. D - 108, 023504 (2023)

• Joint Reconstructions of Growth and Expansion Histories from Stage IV surveys with Minimal Assumptions. I. Dark Energy beyond $\Lambda$.

  R. Calderón, B. L'Huillier, D. Polarski, A. Shafieloo and A. A. Starobinsky - Phys. Rev. D - 106, 083513 (2022)

• Negative Cosmological Constant in the Dark Sector?

  R. Calderón, R. Gannouji, B. L'Huillier & D. Polarski - Phys. Rev. D - 103 (2021) 2, 023526

• Global properties of the growth index: Mathematical aspects and physical relevance.

  R. Calderón, D. Felbacq, R. Gannouji, D. Polarski & A. A. Starobinsky - Phys. Rev. D - 101 (2020) 10, 103501

• Global properties of the growth index of matter inhomogeneities in the Universe.

  R. Calderón, D. Felbacq, R. Gannouji, D. Polarski & A. A. Starobinsky - Phys. Rev. D - 100 (2019) 8, 083503

Talks, Schools & Conferences

Includes clickeable links to recorded talks, slides and/or conference details!

Invited

• Strings & Cosmology @ LAPTh, Annecy - Dark Energy after DESI: a review
• Action Dark Energy, Colloquium @ LUPM, Montpellier - Dark energy beyond $\Lambda$: Clues from the late Universe
• The end of $\Lambda$? @ KASI, Daejeon - Primordial Features in light of the Effective Field Theory of Large Scale Structure
• CosmoVerse Journal Club - Online - Assessing the viability of EDE after ACT DR6 and DESI DR2
• Model-independent Cosmology with gravitational waves, large-scale structure and high-energy surveys @ IFPU, Trieste - Summary of model-independent techniques applied to Cosmology / Hands-on tutorial sessions.
• Colloquium at Sejong University - Exploring Cosmic Tensions and Beyond: A model-independent approach.
• Seminar at the Gran Sasso Science Institute, L'Aquila - Model-independent tests of $\Lambda\rm CDM$ with high and low redshift observations.
• DESI 2023 Collaboration meeting at Durham - Model-independent reconstructions of Dark Energy and Modified Gravity with Year-1 (DESI) data.
• Korea-Japan Workshop on Dark Energy (9th Edition) - Joint Reconstructions of Growth and Expansion histories with Minimal Assumptions.
• KASI's Early Career Researcher (ECR) Seminar Phenomenology of (some) Dark Energy Models beyond $\Lambda$
• Cosmology & High Energy Physics V - Global properties of the Growth Index $\gamma$
• Theoretical Aspects of Modern Cosmology - Properties of the growth of matter inhomogeneities in the Universe.

Contributed

• Théorie, Univers et Gravitation (TUG) @ IPhT, Saclay - Beyond ΛCDM: Lessons and Anomalies from Recent Observations.
• CosmoGrav Spring 2025, Prague - Dark Energy after DESI DR2.
• DESI 2024 Collaboration Meeting at Marseille - Reconstructing Dark Energy using DESI data.
• Cosmology from Home 2024 - Reconstructing Dark Energy using DESI DR1 BAO data.
• Korean Rubin Science Collaboration Workshop - Model-independent Cosmology with LSST.
• Cosmo'23 at IFT, Madrid [Poster] - On the consistency of $\Lambda\rm CDM$ with CMB measurements in light of the latest Planck, ACT, and SPT data.
• Cosmology from Home 2023 - Joint Reconstructions of Growth and Expansion histories from Stage-IV surveys.
• XVI International Conference on Interactions between Particle Physics and Cosmology - Joint Reconstructions of Growth and Expansion histories with Minimal Assumptions.
• Korea Astronomical Society 2023 Spring Meeting - Joint Reconstructions of Growth and Expansion histories with Minimal Assumptions.
• Winter HEP - Strings, Particles and Cosmology – Joint Reconstructions of Growth and Expansion Histories from Stage-IV Surveys.
• Korea Astronomical Society 2022 Spring Meeting - Negative Cosmological Constant in the Dark Sector?
• Rencontre de Physique des Particules (RPP) 2021 - A Negative Cosmological Constant in the Dark Sector?
• Hunting invisibles: Dark Sector, Dark Matter and Neutrinos 2021 - A Negative Cosmological Constant in the Dark Sector?

Informal

• Seminar at LUPM, Montpellier - Beyond ΛCDM: Lessons and Anomalies from Recent Observations.
• Seminar at CEICO FZU, Prague - Challenging the $\Lambda\rm CDM$ paradigm: Dark Energy, DESI BAO and the `cosmic calibration' tension
• Renoir Seminar at CPPM, Marseille - Exploring Cosmic Tensions and Beyond: A model-independent approach.
• DESI's Research Forum - Joint Reconstructions of Growth and Expansion histories with Minimal Assumptions.
• Korea Dark Energy Science (KDESci) Meeting - Joint Reconstructions of Growth and Expansion histories with Minimal Assumptions.
• Euclid's Summer School 2022 - Joint Reconstructions of Growth and Expansion histories with Minimal Assumptions.
• $T^3$: Tea Time Talk at L2C - Primordial Black Holes as Dark Matter: An Introduction.
• PhD Day - What cosmological perturbations tell us about the expansion of the Universe.
• Journée des Doctorants ED I2S - Inflation and the birth of Cosmological perturbations.

Summer Schools

• Euclid 2019 & 2022 - Summer school on both theoretical and observational aspects of the Euclid mission.
  Topics included, among others: Perturbation Theory, Weak gravitational lensing, Galaxy Clustering and statistical methods in Cosmology.

Other

• The slides from my thesis defense can be found here.

Refereeing

In the last couple of years, I have refereed papers from several renowned Scientific Journals

• 2026 - Journal of High Energy Astrophysics (JHEAP) - (x2)
• 2025 - Physics Letters B (PLB) - (x1)
• 2025 - Astrophysics and Space Science - (x1)
• 2025 - The Open Journal of Astrophysics (OJA) - (x1)
• 2024 - Iranian Journal of Astronomy and Astrophysics (IJAA) - (x1)
• 2023 - Journal of Cosmology and Astroparticle Physics (JCAP) - (x6)
• 2023 - Monthly Notices of the Royal Astronomical Society (MNRAS) - (x3)
• 2023 - Physical Review Letters (PRL) - (x2)
• 2022 - Physical Review D (PRD) - (x3)
• 2022 - European Physical Journal C (EPJ-C) - (x3)
• 2022 - International Journal of Modern Physics D (IJMP-D) - (x3)