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SUMMARY:Lattice simulations of alpha-attractor inflation: numerical sensit
 ivity and model comparisons
DTSTART;VALUE=DATE-TIME:20261028T182600Z
DTEND;VALUE=DATE-TIME:20261028T183000Z
DTSTAMP;VALUE=DATE-TIME:20261101T123049Z
UID:indico-contribution-3681@nyx.physics.mcgill.ca
DESCRIPTION:Speakers: Nick Beavis (University of Toronto)\nInflation is a 
 proposed period of accelerated expansion in the early universe\, providing
  a mechanism for generating the primordial fluctuations that seeded cosmic
  structure. Many inflationary models are able to match the large-scale obs
 ervations of the CMB and LSS\, whilst differing in their dynamics and smal
 l-scale characteristics. Nonlinear effects could provide additional inform
 ation about inflationary dynamics\, motivating methods that retain nonline
 ar field evolution such as lattice simulations. For the theoretically well
 -motivated slow-roll $\\alpha$-attractor models\, however\, the nonlinear 
 corrections are expected to be small\, making their numerical resolution c
 hallenging. We used InflationEasy to study E/T-model $\\alpha$-attractor i
 nflation\, testing whether a lattice framework could resolve departures fr
 om linear theory and differences between these models\, after accounting f
 or numerical sensitivity. \n\nOur pipeline was validated against a publish
 ed ultra-slow-roll benchmark. A numerical sensitivity study\, varying spat
 ial resolution\, box size and integration parameters\, identified restrict
 ed wavenumber ranges with $1\\%-5\\%$ numerical sensitivity in the curvatu
 re and post-inflationary scalar-induced GW spectra. A comparison of the E-
 model lattice results with a homogeneous-background evolution found no num
 erically resolved backreaction\, while curvature power spectra agreed with
  linear theory within numerical sensitivity. A model normalisation test sh
 owed that replacing a common leading-order normalisation with model-specif
 ic normalisations reduced the observed differences in E/T-model results be
 low numerical sensitivity.\n\nThese results demonstrate the difficulty of 
 resolving nonlinearity and differences between models for highly perturbat
 ive slow-roll inflationary models\, and highlight the importance of numeri
 cal control and consistent model normalisation when interpreting small dif
 ferences between inflationary predictions.\n\nhttps://nyx.physics.mcgill.c
 a/event/587/contributions/3681/
LOCATION:Online 
URL:https://nyx.physics.mcgill.ca/event/587/contributions/3681/
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