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X-WR-CALNAME:Observing the Big Bang
X-ORIGINAL-URL:https://cosmology.nl
X-WR-CALDESC:Events for Observing the Big Bang
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TZID:Europe/Amsterdam
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DTSTART;TZID=Europe/Amsterdam:20200508T150000
DTEND;TZID=Europe/Amsterdam:20200508T170000
DTSTAMP:20260616T185908
CREATED:20200228T110459Z
LAST-MODIFIED:20200605T120310Z
UID:439-1588950000-1588957200@cosmology.nl
SUMMARY:Amsterdam Spring 2020
DESCRIPTION:Amsterdam\, May 8th. \nThis meeting will take place via remote connection. Here the information for connecting: \nTime: May 8\, 2020 03:00 PM Amsterdam \nJoin Zoom Meeting\nZoom Link\nMeeting ID: 939 4974 3367 \n \n15:00 – 15:45: Talk by Enrico Pajer (DAMPT\, Cambridge) \nTitle:Boostless Boostrap \nAbstract: \nThe space of inflationary models is vast\, containing wide varieties of mechanisms\, symmetries\, and spectra of particles. Consequently\, the space of observational signatures is similarly complex. Hence\, it is natural to look for boundaries of the space of models and their signatures.  \nIn the first part of the talk\, I’ll prove three theorems about the possible symmetries of cosmological correlators. First\, correlation functions of scalar metric fluctuations are uniquely characterized by the soft theorems that generalize Maldacena’s consistency relations and are free from ambiguity under field redefinitions. Second\, whatever the particle content and interactions\, when the standard soft theorems apply\, invariance under de Sitter boosts is only possible if all connected correlators vanish identically\, i.e. if the theory is free. Third\, conformal invariance is the largest set of linearly realized (bosonic) symmetries of the correlators of any single scalar\, irrespectively of any soft theorems or particle content.  \nIn the second part of the talk I’ll discuss some ongoing work on describing cosmological perturbations from “the boundary”\, without explicit reference to the time evolution in the “bulk” for popular models of inflation where boost are broken by some condensate.  \nLink to Recording  here. \n15:45 – 16:00: Break/Discussion \n16:00 – 16:45: Talk by Mustafa Amin (Rice University) \nTitle: Observables from a Complex Early Universe\n \nAbstract: \n Can we tell if the very early universe was simple or complex? What if the early universe was complex — with many fields interacting non-adiabatically with the inflaton during and after inflation? How can we calculate observables if we only have some coarse grained information about the microphysics of such systems? I will present a calculational framework and some general results regarding repeated\, non-adiabatic and stochastic particle production in spectator fields\, and the resulting curvature perturbations. I will discuss observational implications in the form of nontrivial features\, and scale dependence in the curvature power spectrum. The calculational framework is motivated by the phenomenon of current conduction in disordered wires (Anderson Localization)\, where relatively universal results are obtained independent of the details of the microphysics.   \n16:45 – 17:00: Final Discussion
URL:https://cosmology.nl/event/amsterdam-spring-2020/
LOCATION:Zoom Meeting
CATEGORIES:THC meeting
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