Anti-de Sitter $\to$ de Sitter transition driven by Casimir forces and mitigating tensions in cosmological parameters

Abstract

Over the last few years, low- and high-redshift observations set off tensions in the measurement of the present-day expansion rate $H_0$ and in the determination of the amplitude of the matter clustering in the late Universe (parameterized by $S_8$). It was recently noted that both these tensions can be resolved if the cosmological constant parametrizing the dark energy content switches its sign at a critical redshift $z_c\sim 2$. However, the anti-de Sitter (AdS) swampland conjecture suggests that the postulated switch in sign of the cosmological constant at zero temperature seems unlikely because the AdS vacua are an infinite distance appart from de Sitter (dS) vacua in moduli space. We provide an explanation for the required AdS $\to$ dS crossover transition in the vacuum energy using the Casimir forces of fields inhabiting the bulk. We then use entropy arguments to claim that any AdS $\to$ dS transition between metastable vacua must be accompanied by a reduction of the species scale where gravity becomes strong. We provide a few examples supporting this AdS $\to$ dS uplift conjecture.

Matching version to be published in PLB

References in corpus (10)

• A Comprehensive Measurement of the Local Value of the Hubble Constant with 1 km/s/Mpc Uncertainty from the Hubble Space Telescope and the SH0ES Team
• The Pantheon+ Analysis: Cosmological Constraints
• Black Hole Bound on the Number of Species and Quantum Gravity at LHC
• The Dark Dimension and the Swampland
• Relaxing cosmological tensions with a sign switching cosmological constant: Improved results with Planck, BAO, and Pantheon data
• Exploring the $H_0$ tension and the evidence of dark sector interaction from 2D BAO measurements
• Dark energy in light of the early JWST observations: case for a negative cosmological constant?
• Alleviating the need for exponential evolution of JWST galaxies in 10${}^{10}{M}_{\odot }$ haloes at $z>10$ by a modified $\Lambda$CDM power spectrum
• Aspects of the Dark Dimension in Cosmology
• Large extra dimensions from higher-dimensional inflation

Cited by in corpus (23)

• The CosmoVerse White Paper: Addressing observational tensions in cosmology with systematics and fundamental physics
• Phantom matter: a challenging solution to the cosmological tensions
• Cosmological constraints on ${\Lambda }_{\mathrm{s}}$CDM scenario in a type II minimally modified gravity
• From infinite to infinitesimal: Using the Universe as a dataset to probe Casimir corrections to the vacuum energy from fields inhabiting the dark dimension
• ${\Lambda }_{\mathrm{s}}$CDM cosmology: Alleviating major cosmological tensions by predicting standard neutrino properties
• Mapping the ${\Lambda }_{\mathrm{s}}$CDM scenario to $f(T)$ modified gravity: Effects on structure growth rate
• Unexplored regions in teleparallel $f(T)$ gravity: Sign-changing dark energy density
• Thin-wall vacuum decay in the presence of a compact dimension meets the $H_0$ and $S_8$ tensions
• Linear matter density perturbations in the ${\Lambda }_{\mathrm{s}}$CDM model: Examining growth dynamics and addressing the $S_8$ tension
• Do we need wavelets in the late Universe?
• Cosmographic analysis of sign-switching dark energy
• ${\Lambda }_{\mathrm{s}}$CDM cosmology from a type-II minimally modified gravity
• Bulk Black Hole Dark Matter
• Decay of $f(R)$ quintessence into dark matter: mitigating the Hubble tension?
• Revisiting CPL with sign-switching density: To cross or not to cross the NECB
• Running vacuum and H^4-inflation
• Hitchhiker's Guide to the Swampland: The Cosmologist's Handbook to the string-theoretical Swampland Programme
• Role of internal space correlations in the dynamics of a higher-dimensional Bianchi type-I universe: shear scalar and Hubble parameter perspectives
• From negative to positive cosmological constant through decreasing temperature of the Universe: connection with string theory and spacetime foliation results
• Nonlinear Matter Power Spectrum from relativistic $N$-body Simulations: ${\Lambda }_{\mathrm{s}}$CDM versus $\Lambda$CDM
• Crunching, Bouncing, and Cyclical Cosmologies from Dark Sector Interactions
• Background-level reconstruction of scalar-field potentials from dark-energy histories and comparison with analytic potential families
• Statistical consistency of sign-switching vacuum energy with cosmological observations