Nucleosynthesis and CMB bounds on photophilic ALPs: a fresh look

Abstract

We provide a fresh look at the cosmological constraints on axion-like particles (ALPs) that couple predominantly to photons, focusing on lifetimes ${\tau }_a\lesssim 10^4\mathrm{s}$ and masses $m_a\lesssim 10\mathrm{GeV}$. We consider Big Bang Nucleosynthesis (BBN) and Cosmic Microwave Background (CMB) bounds and explore how these limits depend upon the unknown reheating temperature of the Universe, $T_{\mathrm{reh}}$. Compared with some previous studies, we account for the rare decays of these ALPs into light hadrons and show that this leads to extended constraints for several reheating temperatures. Our limits are cast in a model-independent way, and we identify regions of parameter space where these ALPs could alleviate small tensions in the determinations of $N_{\mathrm{eff}}$ and the deuterium abundance.

arXiv comment8 pages + 18 pages, 3 figures, many bounds. v2: matches published version in EPJC. Updated results with a new primordial helium abundance. Our BBN code is now public at: https://github.com/MiguelEA/BBNEasyALP

References in corpus (60)

• String Axiverse
• The Low-Energy Frontier of Particle Physics
• Towards a complete theory of thermal leptogenesis in the SM and MSSM
• Big-Bang Nucleosynthesis and Hadronic Decay of Long-Lived Massive Particles
• Neutralino Relic Density including Coannihilations
• New experimental approaches in the search for axion-like particles
• Thermal Production of Gravitinos
• MeV-scale Reheating Temperature and Thermalization of Neutrino Background
• One percent determination of the primordial deuterium abundance
• Physics Beyond Colliders at CERN: Beyond the Standard Model Working Group Report
• The type IIB string axiverse and its low-energy phenomenology
• Precision big bang nucleosynthesis with improved Helium-4 predictions
• The Sphaleron Rate in the Minimal Standard Model
• Updated Nucleosynthesis Constraints on Unstable Relic Particles
• Quark mass thresholds in QCD thermodynamics
• Invisible Axion Search Methods
• MeV-scale reheating temperature and thermalization of oscillating neutrinos by radiative and hadronic decays of massive particles
• Serendipity in dark photon searches
• Cosmological bounds on pseudo Nambu-Goldstone bosons
• A precision calculation of relic neutrino decoupling
• Revisiting Big-Bang Nucleosynthesis Constraints on Long-Lived Decaying Particles
• Precise Measurement of the e+ e- --> pi+ pi- (gamma) Cross Section with the Initial-State Radiation Method at BABAR
• Cosmological constraints on exotic injection of electromagnetic energy
• The Low-Energy Effective Theory of Axions and ALPs
• Precision Early Universe Thermodynamics made simple: $N_{\mathrm{eff}}$ and Neutrino Decoupling in the Standard Model and beyond
• On a Light Spinless Particle Coupled to Photons
• Neutrino decoupling beyond the Standard Model: CMB constraints on the Dark Matter mass with a fast and precise $N_{\mathrm{eff}}$ evaluation
• Decay photons from the ALP burst of type-II supernovae
• Probing Physics Beyond the Standard Model: Limits from BBN and the CMB Independently and Combined
• Robust cosmological constraints on axion-like particles
• Electromagnetic Cascade in the Early Universe and its Application to the Big-Bang Nucleosynthesis
• Standard Model thermodynamics across the electroweak crossover
• Astrophysical Axion Bounds: The 2024 Edition
• Improved BBN constraints on Heavy Neutral Leptons
• New Bounds for Axions and Axion-Like Particles with keV-GeV Masses
• A new tension in the cosmological model from primordial deuterium?
• The PHLEK Survey: A New Determination of the Primordial Helium Abundance
• Improving Helium Abundance Determinations with Leo P as a Case Study
• Primordial Deuterium after LUNA: concordances and error budget
• The Impact of New d(p,γ)He3 Rates on Big Bang Nucleosynthesis
• Cosmological bounds on sub-MeV mass axions
• The Irreducible Axion Background
• Axion-sourced fireballs from supernovae
• New Constraints on a Light Spinless Particle Coupled to Photons
• Finite temperature effects on the neutrino decoupling in the early Universe
• PQ Axiverse
• Determination of the primordial helium abundance based on NGC 346 an HII region of the Small Magellanic Cloud
• Metastable GeV-scale particles as a solution to the cosmological lithium problem
• Multimessenger Constraints on Radiatively Decaying Axions from GW170817
• Cosmological beam dump: constraints on dark scalars mixed with the Higgs boson
• A new determination of the primordial helium abundance using the analyses of HII region spectra from SDSS
• A Bayesian direct method implementation to fit emission line spectra: Application to the primordial He abundance determination
• Chemical abundances in 7 metal-poor HII regions and a determination of the primordial helium abundance
• Current constraints on cosmological scenarios with very low reheating temperatures
• Primordial neutrinos and new physics: novel approach to solving neutrino Boltzmann equation
• Advancing the phenomenology of GeV-scale axion-like particles
• New physics decaying into metastable particles: impact on cosmic neutrinos
• How new physics affects primordial neutrinos decoupling: Direct Simulation Monte Carlo approach
• Dynamics of metastable Standard Model particles from long-lived particle decays in the MeV primordial plasma
• Fast and Flexible Neutrino Decoupling Part I: The Standard Model