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Dark Energy from Quantum Gravity Discreteness.

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Planck scale discreteness may cause energy diffusion, creating effective dark energy. This quantum gravity effect aligns with observed dark energy, suggesting a granular spacetime structure.

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Area of Science:

  • Theoretical Physics
  • Cosmology
  • Quantum Gravity

Background:

  • Quantum gravity predicts discreteness at the Planck scale.
  • Smooth spacetime approximations may mask fundamental granular structures.
  • Existing models do not fully explain dark energy's observed value.

Purpose of the Study:

  • To investigate how Planck scale discreteness could manifest as observable cosmological effects.
  • To propose a mechanism for the emergence of dark energy from spacetime granularity.
  • To estimate the magnitude of this effect and compare it with observational data.

Main Methods:

  • Developing a relational hypothesis for discreteness materialization in quantum gravity.
  • Applying dimensional analysis to estimate the energy diffusion effect.
  • Formulating a model where energy diffusion generates an effective dark energy term.

Main Results:

  • Minute violations of energy-momentum conservation can arise from spacetime discreteness.
  • This energy diffusion leads to an effective dark energy term in Einstein's equations.
  • The estimated cosmological constant magnitude agrees with observational values.

Conclusions:

  • Planck scale discreteness offers a potential explanation for dark energy.
  • Observed dark energy may be empirical evidence for a granular spacetime.
  • This framework supports Lorentz invariance at low energies while accommodating quantum gravity effects.