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CERN · Theory Department

Maria
Ramos

I'm a theoretical physicist working on physics beyond the Standard Model. My work runs from future colliders to the QCD axion and the nature of dark matter.

Geneva · Switzerland 18 papers · 660+ citations
Maria Ramos
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About

I'm a theoretical physicist and Research Fellow in the Theory Department at CERN. I work on physics beyond the Standard Model: building the physics case for future colliders, mapping the multi-axion landscape, and connecting particle-physics models of dark matter to what experiments actually measure. Before CERN I held research positions in Madrid, and I did my doctorate jointly between Granada and Minho, which went on to win three best-thesis prizes.

Recognition & service

Best-thesis prizes (2022)

Spanish Royal Physics Society (Theory Division), University of Granada and University of Minho.

ECFA, CERN theory

Early-career representative of the CERN theory group on the European Committee for Future Accelerators.

COSMIC WISPers

Swiss representative on the Management Committee of the EU COST Action on weakly-interacting particles.

Geneva · CERN Theory Department

Research

I work across three complementary fronts, from the highest collider energies to the faintest astrophysical signals, all aimed at redefining the most motivated targets for the next discovery in particle physics.

01

The high-energy frontier

Collider phenomenology and effective field theory to probe new physics at machines like the Future Circular Collider, from composite-Higgs models to the Goldstone symmetries and positivity bounds that govern them.

02

The QCD axion

Phenomenology of the QCD axion in realistic multi-axion ("axiverse") scenarios, where mass mixing and cosmological level-crossings reshape the signal regions experiments are built to hunt.

03

Dark matter, from first principles

A rigorous map between particle-physics models and astrophysical data, including a first-principles framework for self-interacting dark matter in the cosmological simulations used to test it.

Journey

2012–2015

I finished my BSc in Physics at the University of Porto, and got my first taste of research at CAUP, on dark-energy models and their observational imprints.

2015–2017

I did my MSc in Theoretical Physics at Porto (19/20), on CPT, modified gravity and the baryon asymmetry of the Universe.

2018–2021

I did my PhD as a co-tutelle between the Universities of Granada and Minho, on the interplay between collider and astrophysical probes of composite-Higgs models.

2022

I defended my thesis Cum Laude, and it went on to win three best-thesis prizes from the Spanish Royal Physics Society, Granada and Minho.

2021–2023

I joined the Marie Skłodowska-Curie network HIDDeN as an Early-Stage Researcher at the Universidad Autónoma de Madrid, with a research stay at the University of California, San Diego.

2023

I was a guest on the Quantum Fracture podcast, talking about the Higgs, the Standard Model and axions. It's been watched over 280,000 times.

2023–2024

I moved to the Instituto de Física Teórica (IFT) in Madrid as a postdoctoral researcher.

2024

I became a Research Fellow in the Theory Department at CERN, and the theory group's early-career representative on the European Committee for Future Accelerators (ECFA).

2025

I gave seminars and plenaries at ETH Zürich, the 8th FCC Physics Workshop and the Pollica workshop on the strong CP problem, and co-organised the Invisibles Workshop at CERN.

2026

Plenary talks at Planck 2026 and the Blois Workshop, and I'm co-organising the MITP institute "ALPs Across Scales". 18 publications and 660+ citations so far.

Publications

I've published 18 papers and 2 white papers, with 660+ citations on INSPIRE-HEP. Each title links straight to its PDF on arXiv.

Journal articles & preprints

  1. 2026How well can the QCD axion hide?S. M. Lee, M. Ramos, F. Vilches · Submitted to JHEP · arXiv:2604.08657PDF ↗
  2. 2025First-Principles Formalism for Simulating Self-Interacting Dark MatterM. Ramos, T. Cohen, M. Lisanti · Submitted to PRL · arXiv:2512.17998PDF ↗
  3. 2026Resonant Landau–Zener conversion in multi-axion systemsD. Dunsky, C. Manzari, P. Quílez, M. Ramos, P. Sørensen · JHEP 01 (2026) 077 · arXiv:2507.06287PDF ↗
  4. 2025Extra-dimensional axion patternsA. de Giorgi, M. Ramos · Phys. Rev. D 111 (2025) 075006 · arXiv:2412.00179PDF ↗
  5. 2024The QCD axion sum ruleB. Gavela, P. Quílez, M. Ramos · JHEP 04 (2024) 056 · arXiv:2305.15465PDF ↗
  6. 2023Running beyond ALPs: shift-breaking and CP-violating effectsS. Das Bakshi, J. Machado, M. Ramos · JHEP 11 (2023) 133 · arXiv:2306.08036PDF ↗
  7. 2023The cost of an ALP solution to the neutral B-anomaliesJ. Bonilla, A. de Giorgi, B. Gavela, L. Merlo, M. Ramos · JHEP 02 (2023) 138 · arXiv:2209.11247PDF ↗
  8. 2022Double Higgs production at TeV e⁺e⁻ colliders with Effective Field TheoriesD. Domènech, M. J. Herrero, R. A. Morales, M. Ramos · Phys. Rev. D 106 (2022) 115027 · arXiv:2208.05452PDF ↗
  9. 2022Following the muon track of hierarchical sectors at LHCbX. Cid Vidal, T. Mombächer, M. Ramos, E. Rodríguez · JHEP 11 (2022) 027 · arXiv:2206.01759PDF ↗
  10. 2021Towards the renormalisation of the SMEFT to dimension eight: Bosonic interactions IM. Chala, G. Guedes, M. Ramos, J. Santiago · SciPost Phys. 11 (2021) 065 · arXiv:2106.05291PDF ↗
  11. 2021Running in the ALPsM. Chala, G. Guedes, M. Ramos, J. Santiago · Eur. Phys. J. C 81 (2021) 181 · arXiv:2012.09017PDF ↗
  12. 2020Novel flavour-changing neutral currents in the top quark sectorN. Castro, M. Chala, A. Peixoto, M. Ramos · JHEP 10 (2020) 038 · arXiv:2005.09594PDF ↗
  13. 2020Effective field theory for vector-like leptons and its collider signalsM. Chala, P. Kozów, M. Ramos, A. Titov · Phys. Lett. B 809 (2020) 135752 · arXiv:2005.09655PDF ↗
  14. 2020Composite dark matter phenomenology in the presence of lighter degrees of freedomM. Ramos · JHEP 07 (2020) 128 · arXiv:1912.11061PDF ↗
  15. 2019Novel B-decay signatures of light scalars at high energy facilitiesA. Blance, M. Chala, M. Ramos, M. Spannowsky · Phys. Rev. D 100 (2019) 115015 · arXiv:1907.13151PDF ↗
  16. 2019Gravitational wave and collider probes of a triplet Higgs sector with a low cutoffM. Chala, M. Ramos, M. Spannowsky · Eur. Phys. J. C 79 (2019) 156 · arXiv:1812.01901PDF ↗
  17. 2017Baryogenesis in non-minimally coupled f(R) theoriesJ. Páramos, M. Ramos · Phys. Rev. D 96 (2017) 104024 · arXiv:1709.04442PDF ↗
  18. 2016Real-time cosmography with redshift derivativesC. Martins, M. Martinelli, E. Calabrese, M. Ramos · Phys. Rev. D 94 (2016) 043001 · arXiv:1606.07261PDF ↗

White papers & reports

  1. 2026The physics case for Weakly Interacting Slim ParticlesA. Arza et al. (COSMIC WISPers) · White paper · arXiv:2603.03433PDF ↗
  2. 2022Unleashing the full power of LHCb to probe Stealth New PhysicsM. Borsato et al. · Rep. Prog. Phys. 85 (2022) · arXiv:2105.12668PDF ↗
  3. 2022Report on neutral B-anomalies from an on-shell scalar exchangeJ. Bonilla, A. de Giorgi, M. Ramos · arXiv:2211.05135PDF ↗
  4. 2020Report on the ECFA Early-Career Researchers Debate on the 2020 European Strategy UpdateA. Bethani et al. · arXiv:2002.02837PDF ↗
Full record & citations on INSPIRE-HEP ↗

Talks & Seminars

I've given 19 invited seminars and 18 conference talks across Europe and the US, including plenaries at Planck, the Blois Workshop and the FCC Physics Workshop, and seminars at ETH Zürich and Berkeley. Here's a selection by year.

2026

Plenary · Planck 2026 · Plenary · Blois Workshop · CERN-TH Cosmo Seminar · CEPC International Workshop

2025

Seminar · ETH Zürich · IST Lisbon Colloquium · Plenary · Pollica “The strong CP problem” · Plenary · “Dark Matter Beyond the Weak Scale III” (UK) · Plenary · 8th FCC Physics Workshop (CERN) · Review · LII Meeting on Fundamental Physics

2024

CERN BSM Forum · Mainz Theorie Palaver · Heidelberg Teilchen-Tee · Plenary · PASCOS (Rencontres du Vietnam) · Seminar · Oskar Klein Centre · Plenary · COSMIC WISPers (DESY)

2023

Seminar · Berkeley Center for Theoretical Physics · UC Santa Cruz · UC San Diego · Plenary · LAPTh “Axions++” · DESY · INFN Padova · Plenary · Patras

2022

Plenary · CERN “Implications of LHCb measurements” · IJCLab Orsay · Plenary · IGFAE “Multimuon signatures” · Plenary · Invisibles Workshop · Plenary · CPAN · MITP “Flavor at the Crossroads”

2021

“Higgs Hunting” Workshop · Seminar · IFT Madrid · Seminar · IGFAE Santiago · Plenary · LIO “Composite connection of Higgs, dark matter and neutrinos”

2019–20

Plenary · “Stealth physics at LHCb” · Seminars at U. Granada, U. Aveiro & IPPP Durham · Plenary · MITP “Dark Matter Identification” · “Higgs and Flavour Physics” (Lisbon)

Full list of talks in the CV ↗

Mentorship & Teaching

Students supervised

  • Saimum SayeedCERN / EPFL Summer Master · 2026Foundations of self-interacting dark-matter simulations · with T. Cohen & D. Harvey
  • Fuensanta VilchesPhD · University of Granada · 2024–2028QCD-axion phenomenology & new-physics searches · with M. Chala
  • Jean-Loup RaymondIFT Summer Master · 2023Anomalous symmetries & the strong CP problem · with B. Gavela

Teaching

  • Nuclear & Particle PhysicsTutor, BSc · Univ. Autónoma de Madrid · 2023
  • Physics of Fundamental ParticlesLecturer · LIP Summer Programme, U. Minho · 2018
  • Invisibles SchoolsLecturer & tutor · Bad Honnef 2023, Paris-Saclay 2022

Also

I co-organise the CERN Theory Journal Club and international workshops like MITP “ALPs Across Scales”, Invisibles and HEFT, and I referee for Physics Letters B, EPJ C and JHEP.

Maria Ramos presenting her PhD thesis defence
My PhD defence, on the interplay between collider and astrophysical probes of composite-Higgs models, 2022.

Outreach

I love bringing particle physics to wider audiences. My episode on the Quantum Fracture podcast, about the Higgs, the Standard Model and axions, has been watched over 280,000 times. I've also run CERN Masterclasses for high-school students in Portugal and the UK, given public lectures at European Researchers’ Night and CAUP, and co-authored a 2026 GenHET interview on diversity and mentorship in physics.

Contact

I'm always happy to hear about collaborations, seminar invitations and science communication. The fastest way to reach me is email.

maria.ramos@cern.ch

CERN · Theory Department · Geneva, Switzerland

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