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Mirror twin Higgs cosmology: constraints and a possible resolution to the H-0 and S-8 tensions

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Title
Mirror twin Higgs cosmology: constraints and a possible resolution to the H-0 and S-8 tensions
Author(s)
Saurabh Bansal; Jeong Han Kim; Christopher Kolda; Matthew Low; Yuhsin Tsai
Publication Date
2022-05
Journal
JOURNAL OF HIGH ENERGY PHYSICS, v.2022, no.5
Publisher
SPRINGER
Abstract
The mirror twin Higgs model (MTH) is a solution to the Higgs hierarchy problem that provides well-predicted cosmological signatures with only three extra parameters: the temperature of the twin sector, the abundance of twin baryons, and the vacuum expectation value (VEV) of twin electroweak symmetry breaking. These parameters specify the behavior of twin radiation and the acoustic oscillations of twin baryons, which lead to testable effects on the cosmic microwave background (CMB) and large-scale structure (LSS). While collider searches can only probe the twin VEV, through a fit to cosmological data we show that the existing CMB (Planck18 TTTEEE+lowE+lowT+lensing) and LSS (KV450) data already provide useful constraints on the remaining MTH parameters. Additionally, we show that the presence of twin radiation in this model can raise the Hubble constant H-0 while the scattering twin baryons can reduce the matter fluctuations S-8, which helps to relax the observed H-0 and S-8 tensions simultaneously. This scenario is different from the typical ACDM + Delta N-eff model, in which extra radiation helps with the Hubble tension but worsens the S-8 tension. For instance, when including the SH0ES and 2013 Planck SZ data in the fit, we find that a universe with greater than or similar to 20% of the dark matter comprised of twin baryons is preferred over ACDM by similar to 4.sigma If the twin sector is indeed responsible for resolving the H-0 and S-8 tensions, future measurements from the Euclid satellite and CMB Stage 4 experiment will further measure the twin parameters to O(1 - 10%)-level precision. Our study demonstrates how models with hidden naturalness can potentially be probed using precision cosmological data.
URI
https://pr.ibs.re.kr/handle/8788114/11695
DOI
10.1007/JHEP05(2022)050
ISSN
1126-6708
Appears in Collections:
Center for Fundamental Theory(순수물리이론 연구단) > 1. Journal Papers (저널논문)
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