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Setting Limits on Supersymmetry Using Simplified Models
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Published on: November 15, 2013

Large-scale suppression from stochastic inflation.

Florian Kühnel1, Dominik J Schwarz

  • 1Fakultät für Physik, Universität Bielefeld, Postfach 100131, 33501 Bielefeld, Germany. kuehnel@physik.uni-bielefeld.de

Physical Review Letters
|January 15, 2011
PubMed
Summary
This summary is machine-generated.

The power spectrum of self-interacting scalar fields in de Sitter spacetime is suppressed on large scales. This suppression prevents infrared divergences in field fluctuation correlations.

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Area of Science:

  • Cosmology
  • Quantum Field Theory

Background:

  • Scalar fields are fundamental in cosmological models.
  • Self-interactions can significantly alter field behavior.
  • De Sitter spacetime is a model for cosmic inflation.

Purpose of the Study:

  • To investigate the power spectrum of self-interacting scalar fields in de Sitter spacetime.
  • To analyze the impact of self-coupling on large-scale structures.
  • To address infrared divergences in correlation functions.

Main Methods:

  • Nonperturbative analysis of the power spectrum.
  • Calculation of the cutoff scale based on coupling strength and expansion rate.
  • Examination of the two-point correlation function.

Main Results:

  • The power spectrum is strongly suppressed on large scales.
  • A cutoff scale is identified, dependent on self-coupling and cosmic expansion.
  • The two-point correlation function is free from infrared divergences.

Conclusions:

  • Self-interactions regularize the power spectrum on large scales.
  • The findings have implications for understanding early universe cosmology.
  • The study provides a mechanism to avoid theoretical inconsistencies.