Resolving the $H_0$ tension with diffusion

Abstract

The tension between the value of the Hubble constant $H_0$ determined from local supernovae data and the one inferred from the cosmic microwave background based on the $\Lambda$CDM cosmological model may indicate the need for new physics. Here, we show that this `Hubble tension' can be resolved in models involving an effective energy flux from the matter sector into dark energy resulting naturally from a combination of unimodular gravity and an energy diffusion process. The scheme is one where dark energy has the standard equation of state $w=-1$. This proposal provides an alternative phenomenological paradigm accounting for the observations, while offering a general framework to study diffusion effects coming from novel fundamental physical processes.

12 pages. v2: Minor changes; v3: minor changes, references added

References in corpus (8)

• Large Magellanic Cloud Cepheid Standards Provide a 1% Foundation for the Determination of the Hubble Constant and Stronger Evidence for Physics Beyond LambdaCDM
• The trouble with $H_0$
• The Hubble series: Convergence properties and redshift variables
• Dark sector interaction: a remedy of the tensions between CMB and LSS data
• Non-Paradoxical Loss of Information in Black Hole Evaporation in a Quantum Collapse Model
• On the Energy Increase in Space-Collapse Models
• Cosmic acceleration in unimodular gravity
• No firewalls in quantum gravity: the role of discreteness of quantum geometry in resolving the information loss paradox

Cited by in corpus (40)

• In the Realm of the Hubble tension $-$ a Review of Solutions
• Challenges for $\Lambda$CDM: An update
• Seven hints that early-time new physics alone is not sufficient to solve the Hubble tension
• The CosmoVerse White Paper: Addressing observational tensions in cosmology with systematics and fundamental physics
• Relaxing cosmological tensions with a sign switching cosmological constant
• Relaxing cosmological tensions with a sign switching cosmological constant: Improved results with Planck, BAO, and Pantheon data
• Omnipotent dark energy: A phenomenological answer to the Hubble tension
• To conserve, or not to conserve: A review of nonconservative theories of gravity
• Simple-graduated dark energy and spatial curvature
• Is the dark energy equation of state parameter singular?
• Cosmological constraints on ${\Lambda }_{\mathrm{s}}$CDM scenario in a type II minimally modified gravity
• Cosmology Intertwined: A Review of the Particle Physics, Astrophysics, and Cosmology Associated with the Cosmological Tensions and Anomalies
• Inevitable manifestation of wiggles in the expansion of the late Universe
• ${\Lambda }_{\mathrm{s}}$CDM cosmology: Alleviating major cosmological tensions by predicting standard neutrino properties
• Addressing the Hubble and $S_8$ Tensions with a Kinetically Mixed Dark Sector
• Alleviating $H_0$ Tension with New Gravitational Scalar Tensor Theories
• Alleviating $H_0$ tension in Horndeski gravity
• Alleviating $H_0$ tension in scalar-tensor and bi-scalar-tensor theories
• Interacting dark sector from the trace-free Einstein equations: cosmological perturbations with no instability
• A critical discussion on the $H_0$ tension
• Unexplored regions in teleparallel $f(T)$ gravity: Sign-changing dark energy density
• Mori-Zwanzig formalism for general relativity: a new approach to the averaging problem
• A clarification on prevailing misconceptions in unimodular gravity
• Inflation and the cosmological (not-so) constant in unimodular gravity
• Quintessential Inflation with Dynamical Higgs Generation as an Affine Gravity
• Linear matter density perturbations in the ${\Lambda }_{\mathrm{s}}$CDM model: Examining growth dynamics and addressing the $S_8$ tension
• ${\Lambda }_{\mathrm{s}}$CDM cosmology from a type-II minimally modified gravity
• Addressing the Hubble tension in Yukawa cosmology?
• Probing the H0 Tension with Holographic Dark Energy in Unimodular Gravity: Insights from DESI DR2
• Revisiting CPL with sign-switching density: To cross or not to cross the NECB
• Reconstruction of inflationary scenarios in non-conservative unimodular gravity
• Stochastic dark matter: Covariant Brownian motion from Planckian discreteness
• Exploring thermodynamics inconsistencies in unimodular gravity: a comparative study of two energy diffusion functions
• Gravitational radiation from binary systems in Unimodular gravity
• Nonlinear Matter Power Spectrum from relativistic $N$-body Simulations: ${\Lambda }_{\mathrm{s}}$CDM versus $\Lambda$CDM
• Charged thin shells in unimodular gravity
• Quantum Gravity, Hydrodynamics and Emergent Cosmology: A Collection of Perspectives
• Emergence of phantom cold dark matter from spacetime diffusion
• Matter Creation in Unimodular Gravity Cosmology
• Background-level reconstruction of scalar-field potentials from dark-energy histories and comparison with analytic potential families