2025/12/19 by Jorge Casalderrey-Solana, Casalderrey-Solana, Jorge, Lucía Castells-Tiestos +5
Physics and Astronomy · #Cosmology and Gravitation Theories #Black Holes and Theoretical Physics #Noncommutative and Quantum Gravity Theories
paper · doi:10.48550/arxiv.2512.18079
We use holography to study dS-invariant states of non-conformal, strongly coupled quantum field theories in four-dimensional de Sitter space. We show that out-of-equilibrium effects can sustain the exponential inflation within the regime of validity of semiclassical gravity, H ≪ M ≪ Msp, with H the Hubble parameter, M the characteristic scale of the quantum field theory, Msp = Mp/N the species scale, Mp the Planck scale, and N2 the number of matter fields. In the holographic description, the required fine-tuning scales only logarithmically with the ratio Msp/H. The resulting solutions exhibit apparent horizons whose increasing area indicates a continuous growth of the comoving entropy density. We suggest that this inflationary regime can arise as the late-time limit of a dynamical evolution starting from an initial Friedmann-Lemaître-Robertson-Walker universe.