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Related Experiment Videos

Breakdown of String Perturbation Theory for Many External Particles.

Sudip Ghosh1, Suvrat Raju1

  • 1International Centre for Theoretical Sciences, Tata Institute of Fundamental Research, Shivakote, Bengaluru 560089, India.

Physical Review Letters
|April 15, 2017
PubMed
Summary
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String perturbation theory breaks down with many low-energy particles. This finding has implications for the black hole information paradox.

Area of Science:

  • High energy physics
  • String theory
  • Quantum gravity

Background:

  • String theory describes fundamental particles and forces.
  • Perturbation theory is a common tool for calculations in physics.
  • The behavior of string theory in certain limits is not fully understood.

Purpose of the Study:

  • To investigate the validity of string perturbation theory in a specific limit.
  • To explore the consequences of this breakdown for fundamental physics problems.

Main Methods:

  • Analysis of massless string scattering amplitudes.
  • Consideration of a limit with a large number of external particles and small individual energies.
  • Examination of the growth of the moduli space volume.
  • Independent numerical evidence.

Related Experiment Videos

Main Results:

  • String perturbation theory breaks down in the considered limit.
  • The breakdown is supported by both theoretical arguments (moduli space volume) and numerical data.

Conclusions:

  • The standard perturbative approach to string theory is insufficient in this regime.
  • This breakdown may offer new insights into resolving the black hole information paradox.