Solving the Hubble tension without spoiling Big Bang Nucleosynthesis

Abstract

The Hubble parameter inferred from cosmic microwave background observations is consistently lower than that from local measurements, which could hint towards new physics. Solutions to the Hubble tension typically require a sizable amount of extra radiation $\Delta N_{\mathrm{eff}}^{}$ during recombination. However, the amount of $\Delta N_{\mathrm{eff}}^{}$ in the early Universe is unavoidably constrained by Big Bang Nucleosynthesis (BBN), which causes problems for such solutions. We present a possibility to evade this problem by introducing neutrino self-interactions via a simple Majoron-like coupling. The scalar is slightly heavier than $1\mathrm{MeV}$ and allowed to be fully thermalized throughout the BBN era. The rise of neutrino temperature due to the entropy transfer via $\varphi \to \nu \overline{\nu }$ reactions compensates the effect of a large $\Delta N_{\mathrm{eff}}^{}$ on BBN. Values of $\Delta N_{\mathrm{eff}}^{}$ as large as $0.7$ are in this case compatible with BBN. We perform a fit to the parameter space of the model.

9 pages, 4 figures

References in corpus (19)

• Large Magellanic Cloud Cepheid Standards Provide a 1% Foundation for the Determination of the Hubble Constant and Stronger Evidence for Physics Beyond LambdaCDM
• Primordial Nucleosynthesis in the Precision Cosmology Era
• The effects of He I 10830 on helium abundance determinations
• Cosmic neutrino cascades from secret neutrino interactions
• Interacting neutrinos in cosmology: exact description and constraints
• IceCube PeV-EeV Neutrinos and Secret Interactions of Neutrinos
• Updated constraints on massive neutrino self-interactions from cosmology in light of the $H_0$ tension
• Comparing early dark energy and extra radiation solutions to the Hubble tension with BBN
• Boltzmann hierarchy for interacting neutrinos I: formalism
• Supernova Constraints on Massive (Pseudo)Scalar Coupling to Neutrinos
• CνB absorption line in the neutrino spectrum at IceCube
• Neutrino Self-Interactions and Double Beta Decay
• Are cosmological neutrinos free-streaming?
• Constraints on secret neutrino interactions after Planck
• Intimate Relationship Between Sterile Neutrino Dark Matter and $\Delta N_{\mathrm{eff}}$
• Astrophysical constraints on non-standard coherent neutrino-nucleus scattering
• Neutrino Masses and Hubble Tension via a Majoron in MFV
• Incomplete neutrino decoupling effect on big bang nucleosynthesis
• Self-interacting neutrinos, the Hubble parameter tension, and the Cosmic Microwave Background

Cited by in corpus (27)

• The $H_0$ Olympics: A fair ranking of proposed models
• The CosmoVerse White Paper: Addressing observational tensions in cosmology with systematics and fundamental physics
• Neutrino Self-Interactions: A White Paper
• The Hubble Tension as a Hint of Leptogenesis and Neutrino Mass Generation
• Probing Secret Interactions of Astrophysical Neutrinos in the High-Statistics Era
• Tau Neutrinos in the Next Decade: from GeV to EeV
• Neural Network Reconstruction of Late-Time Cosmology and Null Tests
• Cosmological Constraints on First-Order Phase Transitions
• Neutrino non-standard interactions meet precision measurements of $N_{\mathrm{eff}}$
• Massive neutrino self-interactions and inflation
• Self-Interacting Neutrinos in Light of Large-Scale Structure Data
• The two-mode puzzle: Confronting self-interacting neutrinos with the full shape of the galaxy power spectrum
• Massive neutrino self-interactions with a light mediator in cosmology
• Strong constraints on a simple self-interacting neutrino cosmology
• Resonant neutrino self-interactions and the $H_0$ tension
• Constraints on new physics around the MeV scale with cosmological observations
• First constraints on non-minimally coupled Natural and Coleman-Weinberg inflation and massive neutrino self-interactions with Planck+BICEP/Keck
• Fresh Look at Neutrino Self-Interactions With the Lyman-$\alpha$ Forest: Constraints from EFT and PRIYA Simulations
• Time-delayed neutrino emission from supernovae as a probe of dark matter-neutrino interactions
• Non-conservation of Lepton Numbers in the Neutrino Sector Could Change the Prospects for Core Collapse Supernova Explosions
• Impostor Among $\nu$s: Dark Radiation Masquerading as Self-Interacting Neutrinos
• Resonant neutrino self-interactions: Insights from the full shape galaxy power spectrum
• Simulating neutrino echoes induced by secret neutrino interactions
• Reconciling Cosmological Tensions with Inelastic Dark Matter and Dark Radiation in a $\mathbf{U}(1{)}_{\mathbf{D}}$ Framework
• A New Census of the Universe's Entropy
• Tritium beta decay with modified neutrino dispersion relations: KATRIN in the dark sea
• Freeze-in Dark Matter via Lepton Portal: Hubble Tension and Stellar Cooling