A subdominant oscillating scalar field with about 10% energy density at redshift 3500 and a potential ∝ φ^{2n} (n≈3) can resolve the Hubble tension, with CMB-S4-detectable polarization signatures and self-resonance for n≈2.
Modulated Natural Inflation
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abstract
We discuss some model-independent implications of embedding (aligned) axionic inflation in string theory. As a consequence of string theoretic duality symmetries the pure cosine potentials of natural inflation are replaced by modular functions. This leads to "wiggles" in the inflationary potential that modify the predictions with respect to CMB-observations. In particular, the scalar power spectrum deviates from the standard power law form. As a by-product one can show that trans-Planckian excursions of the aligned effective axion are compatible with the weak gravity conjecture.
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astro-ph.CO 1years
2019 1verdicts
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Oscillating scalar fields and the Hubble tension: a resolution with novel signatures
A subdominant oscillating scalar field with about 10% energy density at redshift 3500 and a potential ∝ φ^{2n} (n≈3) can resolve the Hubble tension, with CMB-S4-detectable polarization signatures and self-resonance for n≈2.