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Related Experiment Videos

Dynamical zero-temperature phase transitions and cosmic inflation or deflation.

Ralf Schützhold1

  • 1Institut für Theoretische Physik, Technische Universität Dresden, D-01062 Dresden, Germany.

Physical Review Letters
|October 4, 2005
PubMed
Summary

Sweeping through zero-temperature phase transitions reveals universal quantum behaviors analogous to quantum fields in expanding universes. This suggests cosmic inflation might have originated from such a phase transition.

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Area of Science:

  • Condensed Matter Physics
  • Cosmology
  • Quantum Field Theory

Background:

  • Zero-temperature phase transitions exhibit universal critical behavior.
  • Quantum field excitations near critical points can be mapped to curved spacetime phenomena.

Purpose of the Study:

  • To explore the universal behavior of systems undergoing zero-temperature phase transitions.
  • To investigate the analogy between critical dynamics and quantum fields in expanding spacetimes.
  • To assess if cosmic inflation could be explained by such a phase transition.

Main Methods:

  • Utilizing a time-dependent external parameter to drive systems through phase transitions.
  • Employing the curved spacetime analogy to analyze quantum fluctuations.
  • Deriving the induced spectrum of excitations.

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Main Results:

  • Systems exhibit universal behavior near critical points.
  • Excitations behave as quantum fields in expanding or contracting universes.
  • Quantum fluctuations are amplified or suppressed due to horizon crossing, freezing, and squeezing.

Conclusions:

  • The dynamics of phase transitions closely resemble quantum field behavior in curved spacetimes.
  • The analogy provides a framework for understanding quantum fluctuation generation.
  • Cosmic inflation is a potential candidate for a phase transition exhibiting these universal dynamics.