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Constraining de Sitter Space in String Theory.

David Kutasov1, Travis Maxfield1, Ilarion Melnikov2

  • 1Enrico Fermi Institute, University of Chicago, Chicago, Illinois 60637, USA.

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Summary
This summary is machine-generated.

Heterotic string theory lacks classical de Sitter vacua in four or more dimensions. This finding, also applicable to type II vacua without specific fluxes, challenges assumptions in string landscape studies.

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Area of Science:

  • Theoretical Physics
  • String Theory
  • Cosmology

Background:

  • String theory aims to unify fundamental forces, exploring possible universe configurations (vacua).
  • Previous studies indicated limitations in supergravity models for certain spacetime types.
  • De Sitter spacetimes are crucial for understanding cosmic acceleration.

Purpose of the Study:

  • To investigate the existence of classical de Sitter vacua in heterotic and type II string theory.
  • To extend existing supergravity no-go results to higher curvature regimes.
  • To analyze the implications for string landscape genericity arguments.

Main Methods:

  • Analysis of heterotic string theory classical vacua.
  • Consideration of type II vacua in the absence of Ramond-Ramond fluxes.
  • Extension of supergravity no-go theorems to high-curvature scenarios.
  • Interpretation via dual type II orientifold constructions.

Main Results:

  • Heterotic string theory does not support classical de Sitter vacua in four or higher dimensions.
  • Type II vacua also lack these de Sitter solutions without Ramond-Ramond fluxes.
  • The findings apply to regimes characterized by high spacetime curvature.

Conclusions:

  • The existence of de Sitter solutions in string theory is more restricted than previously assumed.
  • Genericity arguments in string landscape research require careful re-evaluation.
  • This work impacts the search for realistic cosmological models within string theory.