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SUMMARY:Which Cosmological EFTs Survive the UV?  - A first step from quant
 um consistency to late-time cosmology
DTSTART:20260611T070000Z
DTEND:20260611T090000Z
DTSTAMP:20260525T210000Z
UID:indico-event-1310@indico.ibs.re.kr
DESCRIPTION:Speakers: Carlos Pastor (Heidelberg U)\n\nEFTs for cosmology a
 re one of our best tools to describe possible departures from GR in the Un
 iverse we observe. However\, not every low-energy theory can arise from a 
 consistent quantum theory at high energies. In this talk\, I will discuss 
 how this question can be addressed using asymptotic safety (AS)\, and how 
 UV consistency can constrain the space of viable modified-gravity EFTs. In
 stead of treating all EFT parameters as equally possible\, we can ask whic
 h regions of theory space are connected to a well-defined fixed point in t
 he UV. This provides the first ingredients of a UV-to-IR strategy\, restri
 cting the allowed low-energy theories and indicating how quantum-gravity i
 nformation may reach cosmology.I will first give a pedagogical introductio
 n to AS and the functional RG\, focusing on the physical picture rather th
 an technical details. I will then apply the framework to generalized Proca
  theories\, a class of vector–tensor modified-gravity EFTs with relevant
  cosmological applications\, to illustrate how this analysis is performed 
 in practice and how it can constrain viable IR theories. I will close by d
 iscussing how UV completion can become a practical guide for cosmology\, t
 ranslating quantum-consistency conditions into phenomenological signatures
 \, from late-time modified gravity to early-universe observables\, strong-
 gravity tests and GW probes.\n\nhttps://indico.ibs.re.kr/event/1310/
URL:https://indico.ibs.re.kr/event/1310/
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