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Generation and Coherent Control of Pulsed Quantum Frequency Combs
06:42

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Published on: June 8, 2018

Cosmological constant: a lesson from Bose-Einstein condensates.

Stefano Finazzi1, Stefano Liberati, Lorenzo Sindoni

  • 1SISSA, Trieste, Italy.

Physical Review Letters
|March 10, 2012
PubMed
Summary
This summary is machine-generated.

Emergent gravity models, using Bose-Einstein condensates, may naturally explain the small cosmological constant. A full quantum theory is needed for accurate calculations, making it a key test for emergent gravity scenarios.

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Area of Science:

  • Theoretical Physics
  • Quantum Gravity
  • Condensed Matter Physics

Background:

  • The cosmological constant problem is a major challenge in modern physics.
  • Understanding its value is crucial for cosmology and fundamental physics.
  • Emergent gravity offers a potential framework to address this problem.

Purpose of the Study:

  • To investigate the cosmological constant from an emergent gravity perspective.
  • To utilize analogue gravity models, specifically Bose-Einstein condensates, for this investigation.

Main Methods:

  • Employing an analogue gravity model within a Bose-Einstein condensate.
  • Describing emergent metric dynamics using a Poisson-like equation with a vacuum source term.
  • Directly computing the vacuum source term related to the cosmological constant.

Main Results:

  • The vacuum source term in emergent gravity scenarios can be naturally much smaller than expected.
  • Analogue gravity in Bose-Einstein condensates provides a mechanism for a suppressed cosmological constant.

Conclusions:

  • Emergent gravity offers a plausible explanation for the small observed value of the cosmological constant.
  • Accurate computation requires a deeper understanding of how Einstein's equations emerge from quantum theory.
  • The cosmological constant serves as a critical test for quantum and emergent gravity theories.