The Hubble Tension Persists Beyond Slow-roll Inflation. (arXiv:1910.05670v1 [astro-ph.CO])
<a href="http://arxiv.org/find/astro-ph/1/au:+Liu_M/0/1/0/all/0/1">MiaoXin Liu</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Huang_Z/0/1/0/all/0/1">Zhiqi Huang</a>
For a standard $Lambda$CDM universe with a power-law primordial power
spectrum, the discrepancy between early- and late-universe measurements of the
Hubble constant continued to grow, and recently reached $5.3sigma$. During
inflation, events beyond slow-roll often lead to features in the primordial
power spectrum, hence breaking the power-law assumption in the derivation of
the Hubble tension. We investigate, in a very model-independent way, whether
such inflationary “glitches” can ease the Hubble tension. The recently
released Planck temperature and polarization data and the 2019 SH0ES+H0LiCOW
joint constraint on the Hubble constant are combined to drive a blind
Daubechies wavelet signal search in the primordial power spectrum, up to a
resolution $Delta ln ksim 0.1$. We find no significant detection of any
features beyond power-law. With 64 more degrees of freedom injected in the
primordial power spectrum, the Hubble tension persists at a $4.9sigma$ level.
For a standard $Lambda$CDM universe with a power-law primordial power
spectrum, the discrepancy between early- and late-universe measurements of the
Hubble constant continued to grow, and recently reached $5.3sigma$. During
inflation, events beyond slow-roll often lead to features in the primordial
power spectrum, hence breaking the power-law assumption in the derivation of
the Hubble tension. We investigate, in a very model-independent way, whether
such inflationary “glitches” can ease the Hubble tension. The recently
released Planck temperature and polarization data and the 2019 SH0ES+H0LiCOW
joint constraint on the Hubble constant are combined to drive a blind
Daubechies wavelet signal search in the primordial power spectrum, up to a
resolution $Delta ln ksim 0.1$. We find no significant detection of any
features beyond power-law. With 64 more degrees of freedom injected in the
primordial power spectrum, the Hubble tension persists at a $4.9sigma$ level.
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