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Matter-Driven Change of Spacetime Topology.

J Ambjørn1, Z Drogosz2, J Gizbert-Studnicki2

  • 1The Niels Bohr Institute, Copenhagen University, Blegdamsvej 17, DK-2100 Copenhagen Ø, Denmark.

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Scalar fields can alter the topology of quantum universes. Simulations show a phase transition that may simplify complex topologies in early universe models.

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Area of Science:

  • Quantum gravity
  • Cosmology
  • Theoretical physics

Background:

  • The causal dynamical triangulations (CDT) model provides a framework for studying quantum gravity.
  • Understanding the early universe requires investigating quantum effects on spacetime geometry and topology.

Purpose of the Study:

  • To investigate the influence of matter fields on the geometry and topology of quantum universes within the CDT model.
  • To explore the role of scalar fields as a new parameter in quantum gravity simulations.

Main Methods:

  • Utilizing Monte Carlo computer simulations to model quantum universes.
  • Implementing multicomponent scalar fields with toroidal compactification (parameterized by δ) within the CDT framework.

Main Results:

  • Observed a phase transition in the quantum universe triggered by the scalar field parameter δ.
  • Demonstrated that changing δ can induce a transition from a non-simply connected topology to a simply connected one.

Conclusions:

  • Scalar fields can significantly impact the topological structure of quantum universes.
  • The discovered phase transition has potential implications for understanding the evolution of early universe topologies.