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Updated: Jul 29, 2025

Setting Limits on Supersymmetry Using Simplified Models
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Constraining the Bispectrum from Bouncing Cosmologies with Planck.

Bartjan van Tent1, Paola C M Delgado2, Ruth Durrer3

  • 1Université Paris-Saclay, CNRS/IN2P3, IJCLab, 91405 Orsay, France.

Physical Review Letters
|May 27, 2023
PubMed
Summary
This summary is machine-generated.

Bouncing cosmological models, while potentially explaining cosmic microwave background (CMB) anomalies, generate non-Gaussianities. Planck data analysis reveals these models are significantly excluded, challenging their viability for explaining CMB large-scale anomalies.

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Area of Science:

  • Cosmology
  • Theoretical Physics
  • Astrophysics

Background:

  • Bouncing cosmological models, including those from loop quantum cosmology, can precede inflation and produce nearly scale-invariant fluctuation spectra observed in the cosmic microwave background (CMB).
  • These models inherently generate non-Gaussianities and a bispectrum, which were theorized to mitigate CMB large-scale anomalies due to their scale-dependent nature.

Purpose of the Study:

  • To investigate the viability of bouncing cosmological models in light of observed cosmic microwave background (CMB) data.
  • To determine if models proposed to mitigate CMB large-scale anomalies are consistent with observational constraints.

Main Methods:

  • Analysis of Planck satellite data, focusing on cosmic microwave background (CMB) observations.
  • Statistical comparison of theoretical predictions from bouncing models, specifically their non-Gaussian features, against Planck data.
  • Evaluation of model exclusion significance based on deviations from observed CMB properties.

Main Results:

  • Bouncing models, even those designed to address CMB anomalies, exhibit significant deviations from Planck data.
  • The non-Gaussianities predicted by these models are constrained to be much smaller than required to mitigate large-scale CMB anomalies.
  • Specific models are excluded by the Planck data with high statistical significance, ranging from 5.4 to 14 standard deviations.

Conclusions:

  • Bouncing cosmological models that aim to resolve CMB large-scale anomalies are strongly disfavored by current Planck observational data.
  • The predicted non-Gaussianities in these models are incompatible with the observed cosmic microwave background (CMB) statistics.
  • The study significantly constrains the parameter space for bouncing cosmologies, highlighting tensions with observational cosmology.