The Axiverse Extended: Vacuum Destabilisation, Early Dark Energy and Cosmological Collapse

Abstract

A model is presented in the philosophy of the "String Axiverse" of Arvanitaki et al (arXiv:0905.4720v2 [hep-th]) that incorporates a coupling of ultralight axions to their corresponding moduli through the mass term. The light fields roll in their potentials at late times and contribute to the dark sector energy densities in the cosmological expansion. The addition of a coupling and extra field greatly enrich the possible phenomenology of the axiverse. There are a number of interesting phases where the axion and modulus components behave as Dark Matter or Dark Energy and can have considerable and distinct effects on the expansion history of the universe by modifying the equation of state in the past or causing possible future collapse of the universe. In future such a coupling may help to alleviate fine tuning problems for cosmological axions. We motivate and present the model, and briefly explore its cosmological consequences numerically.

13 pages, 17 figures, published in PRD. v3: corrected SUSY interpretation of axion potential scale

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• Search for Spectral Irregularities due to Photon-Axionlike-Particle Oscillations With the Fermi Large Area Telescope
• Sensitivity Projections for Dark Matter Searches with the Fermi Large Area Telescope
• The Fermi Large Area Telescope as a Galactic Supernovae Axionscope
• Cosmological window onto the string axiverse and the supersymmetry breaking scale
• Anisotropic Modulus Stabilisation: Strings at LHC Scales with Micron-sized Extra Dimensions
• $H_0$ Tension, Swampland Conjectures and the Epoch of Fading Dark Matter
• Tensor Detection Severely Constrains Axion Dark Matter
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• Sensitivity of the Cherenkov Telescope Array to the detection of axion-like particles at high gamma-ray opacities
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• Axion Isocurvature Collider
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• Constraining SUSY with Heavy Scalars -- using the CMB
• Cosmology of Axions and Moduli: A Dynamical Systems Approach
• Self-organized criticality in boson clouds around black holes
• Non-Standard Cosmological Models and the trans-Planckian Censorship Conjecture
• How can we tell whether dark energy is composed by multiple fields?
• Small scale structures in coupled scalar field dark matter
• Exploring ALPs beyond the canonical
• COZMIC. I. Cosmological Zoom-in Simulations with Initial Conditions Beyond Cold Dark Matter
• Cosmological limits on axions and axion-like particles
• Probing $\mu$eV ALPs with future LHAASO observation of AGN $\gamma$-ray spectra
• Searching for dark energy in the matter-dominated era
• Observational evidence for Early Dark Energy as a unified explanation for Cosmic Birefringence and the Hubble tension
• Searching for dilaton fields in the Ly$\alpha$ forest
• Axion production from primordial magnetic fields
• An attempt to study axion-photon coupling using compact binary systems with high Shapiro time delay
• Testing the growth of cosmic structures during the Dark Ages