A bstract The mirror twin Higgs model (MTH) is a solution to the Higgs hierarchy problem that provides wellpredicted 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 largescale structure (LSS). While collider searches can only probe the twin VEV, through a fit to cosmological data we show that the existing CMB (Planck18more »
This content will become publicly available on February 1, 2023
Constraints from highprecision measurements of the cosmic microwave background: the case of disintegrating dark matter with Λ or dynamical dark energy
Abstract In recent years discrepancies have emerged in measurements of the presentday rate of expansion of the universe H 0 and in estimates of the clustering of matter S 8 . Using the most recent cosmological observations we reexamine a novel model proposed to address these tensions, in which cold dark matter disintegrates into dark radiation. The disintegration process is controlled by its rate Q = αℋρ ddm , where α is a (constant) dimensionless parameter quantifying the strength of the disintegration mechanism and ℋ is the conformal Hubble rate in the spatially flat FriedmannLemaîtreRobertsonWalker universe and ρ ddm is the energy density of the disintegrating cold dark matter. We constrain this model with the latest 2018 Planck temperature and polarization data, showing that there is no evidence for α≠ 0 and that it cannot solve the H 0 tension below 3σ, clashing with the result obtained by analyzing the Planck 2015 temperature data. We also investigate two possible extensions of the model in which the dark energy equationofstate parameter w ≠ 1. In this case it is possible to combine Planck data with the SH0ES measurement, and we demonstrate that in both these models the H 0 tension is resolved more »
 Award ID(s):
 2112527
 Publication Date:
 NSFPAR ID:
 10331642
 Journal Name:
 Journal of Cosmology and Astroparticle Physics
 Volume:
 2022
 Issue:
 02
 Page Range or eLocationID:
 012
 ISSN:
 14757516
 Sponsoring Org:
 National Science Foundation
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