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UID:109@gravity.physik.fau.de
DTSTART;TZID=Europe/Berlin:20250122T133000
DTEND;TZID=Europe/Berlin:20250122T150000
DTSTAMP:20250119T170811Z
URL:https://www.gravity.physik.fau.de/events/tba-giulia-maniccia-to-be-con
 firmed/
SUMMARY:From Gaussian Reference Fluids to Primordial Perturbations: the Rol
 e of Time in Quantum Gravity\, Dr. Giulia Maniccia\, Sapienza University o
 f Rome
DESCRIPTION:The absence of an external time parameter in General Relativity
  creates a conflict with Quantum Field Theory\, commonly referred to as th
 e "problem of time". Various approaches\, ranging from the canonical frame
 work to relational formalisms\, have been proposed to address this issue.\
 nIn the first part of the talk\, I will examine time constructions within 
 the canonical WKB (perturbative) framework\, demonstrating how certain con
 ceptual challenges can be addressed by introducing a "Gaussian reference f
 luid". Inspired by the work of Kuchař and Torre\, this fluid is here trea
 ted as a fast-matter component within a Born-Oppenheimer-like scheme.\nIn 
 the second part\, I will present the ongoing effort to reformulate such mo
 dels within a fully gauge-invariant formalism\, taking fluid perturbations
  into account\, incorporating fluid perturbations as suggested by recent s
 tudies in the reduced phase space framework.\nOn a cosmological scale\, I 
 will demonstrate how the perturbative Gaussian fluid approach leads to a b
 reaking of scale invariance in the primordial power spectrum in the exact 
 de Sitter phase.
CATEGORIES:Group Seminar
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TZID:Europe/Berlin
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DTSTART:20241027T020000
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TZOFFSETTO:+0100
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