TL;DR
This paper discusses a scenario where gravity and matter emerge from a fundamental discrete structure, leading to a naturally flat universe with small cosmological constant and preserved Lorentz symmetry at high energies.
Contribution
It introduces the Fermi-point scenario of emergent gravity, proposing that gravity, matter, and symmetries emerge from underlying discrete physics, challenging traditional quantization approaches.
Findings
Gravity emerges with fermionic and bosonic matter
Space-time is naturally 4-dimensional and flat
Lorentz symmetry persists above the Planck energy
Abstract
The Fermi-point scenario of emergent gravity has the following consequences: gravity emerges together with fermionic and bosonic matter; emergent fermionic matter consists of massless Weyl fermions; emergent bosonic matter consists of gauge fields; Lorentz symmetry persists well above the Planck energy; space-time is naturally 4-dimensional; Universe is naturally flat; cosmological constant is naturally small or zero; underlying physics is based on discrete symmetries; `quantum gravity' cannot be obtained by quantization of Einstein equations; there is no contradiction between quantum mechanics and gravity; etc.
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