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Area of Science:

  • Cosmology
  • Theoretical Physics
  • Quantum Gravity

Background:

  • The multiverse concept suggests a vast collection of universes.
  • Third quantisation provides a framework for studying universe creation and evolution.
  • Scalar fields are fundamental in cosmological models, including inflation.

Purpose of the Study:

  • To investigate Euclidean wormhole solutions as potential bridges between universes.
  • To model the multiverse using a scalar field within third quantisation.
  • To calculate the probability of transitions between baby universes and de Sitter universes.

Main Methods:

  • Utilising Euclidean wormhole solutions in the context of third quantisation.
  • Modelling matter content with a scalar field.
  • Computing tunnelling probabilities for universe transitions.

Main Results:

  • Euclidean wormhole solutions connect baby universes to asymptotically de Sitter universes.
  • Tunnelling probabilities for these connections were computed.
  • The likelihood of specific universes undergoing inflation was determined based on current inflationary energy scale bounds.

Conclusions:

  • The study provides insights into the dynamics of baby universes within a multiverse.
  • It highlights which universes are more prone to nucleating and inflating.
  • Findings contribute to understanding the conditions for a standard inflationary era.