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Area of Science:

  • Theoretical Physics
  • Cosmology
  • Quantum Field Theory

Background:

  • The cosmological constant problem and the large hierarchy of energy scales in physics remain significant theoretical challenges.
  • Vacuum energy contributions from matter sectors, including quantum corrections and phase transitions, are expected to influence cosmic evolution.
  • Current models struggle to reconcile the observed small value of dark energy with theoretical predictions.

Purpose of the Study:

  • To introduce a new formulation of general relativity that effectively removes vacuum energy from gravitational interactions.
  • To investigate the implications of this reformulation for the standard model of particle physics and early Universe cosmology.
  • To explore the consequences for the universe's future evolution, including its curvature and potential collapse.

Main Methods:

  • Reformulating general relativity by making dimensional parameters in matter sector functionals dependent on the 4-volume element of the Universe.
  • Analyzing the impact of this reformulation on vacuum energy contributions, including loop corrections and phase transitions.
  • Assessing the consistency with established cosmological models, such as inflation, and the observed hierarchy of scales.

Main Results:

  • The proposed mechanism completely sequesters vacuum energy from gravity, preventing it from sourcing cosmic curvature.
  • Contributions from phase transitions to vacuum energy are rendered automatically small.
  • The model is consistent with the Planck, electroweak, and curvature scales, as well as early Universe cosmology and inflation.

Conclusions:

  • The vacuum curvature of an old and large universe is predicted to be very small, not zero.
  • The observed dark energy equation of state parameter, w(DE) ≃ -1, is a transient phenomenon within this framework.
  • The reformulated theory suggests that the universe will eventually collapse in the future.