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Thomas Colas

@CosmoColas

Postdoc in #cosmology @APC_Laboratory @univ_paris_cite | #earlyuniverse and Schwinger-Keldysh #EFTs 🌌 Bluesky: @cosmocolas.bsky.social 🦋

apc.u-paris.fr/~tcolas/index.html
Joined February 2021
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[Announcement] Synergies in non-equilibrium QFT: from heavy ions to the cosmos 📍 EPFL & Les Diablerets, Switzerland 📅 21 June–16 July 2027 Summer school, two-week workshop & research retreat. Limited financial support available. Register by 28/02/27: indico.cern.ch/event/1728745…

Synergies in non-equilibrium QFT: from heavy ions to the cosmos

The four-week programme, Synergies in non-equilibrium QFT: from heavy ions to the cosmos funded by the Bernoulli Center for Fundamental Studies at EPFL will take place in Lausanne and Les Diablerets...

indico.cern.ch
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📢 Working in Particle Physics, Astro, or Nuclear (PPAN) in the UK? You received a survey regarding Early-Career Researchers and impact of STFC cuts on them. If you didn't, PM me. We need as many ECRs to fill it asap, and you could help spread it. If you were, spread it!🧪
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1/ 📄 New paper’s out: we study phase coherence in primordial #cosmology. The sharp acoustic peaks of the CMB and their late-time imprint in BAO require primordial perturbations to oscillate with extremely coherent phases. What fixes this coherence? 🧵 arxiv.org/abs/2609.03012
Universal CMB Phase Coherence from Single-Field Inflation

Universal CMB Phase Coherence from Single-Field Inflation

The phase coherence of primordial perturbations shapes the acoustic peaks of the CMB and is regarded as a key signature of inflation. Inflationary scenarios at different energy scales, thus with...

arxiv.org
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7/ In fact, the result is insensitive to essentially any intermediate expansion history: prolonged reheating/preheating, early matter or PBH domination, kination, early dark energy, or a time-dependent equation of state. None changes the final coherence if ζ is conserved.
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8/ On CMB scales Δθₖ* ~ e⁻¹¹⁷. This gives a new inflationary consistency relation: the primordial power spectrum fixes the phase uncertainty🧭 A measurable loss of coherence would point to new primordial physics: non-adiabaticity or decoherence.
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A huge thank you to everyone who joined the Contours 2026 conference and made it such a lively event! I'm very grateful to all the participants, speakers, and admin teams who helped make it happen. It has been a fantastic week of discussions 🌌🕳️🌊🪞 indico.global/event/16432/ov…
Contours 2026 - DAMTP - University of Cambridge - 29/06 to 03/07/2026

ALT Contours 2026 - DAMTP - University of Cambridge - 29/06 to 03/07/2026

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📄 New paper with Sebastián Céspedes🌌🌊 We revisit stochastic inflation from the viewpoint of Schwinger–Keldysh EFTs and Wilsonian RG. Main message: stochastic inflation emerges as the IR limit of a real-time Wilsonian RG flow arxiv.org/abs/2605.11096 #cosmology #qft #physics🧵
Stochastic inflation from a non-equilibrium renormalization group

Stochastic inflation from a non-equilibrium renormalization group

Understanding stochastic inflation, and in particular the systematic computation of controlled corrections from first principles, remains an important open problem. In this work, we address this...

arxiv.org
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This perspective opens many directions for stochastic inflation: 🔄 non-equilibrium RG flows 📉 infrared fixed points ⚛️ power counting and operator hierarchies 🌊 non-equilibrium steady states and more generally a Wilsonian understanding of real-time cosmological evolution.
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Many thanks to everyone who discussed stochastic inflation, Schwinger–Keldysh EFTs and RG ideas with us over the past months. Discussions and feedback were extremely valuable throughout this project 🙏
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