Cosmological Signals of a Mirror Twin Higgs

Abstract

We investigate the cosmology of the minimal model of neutral naturalness, the mirror Twin Higgs. The softly-broken mirror symmetry relating the Standard Model to its twin counterpart leads to significant dark radiation in tension with BBN and CMB observations. We quantify this tension and illustrate how it can be mitigated in several simple scenarios that alter the relative energy densities of the two sectors while respecting the softly-broken mirror symmetry. In particular, we consider both the out-of-equilibrium decay of a new scalar as well as reheating in a toy model of twinned inflation, Twinflation. In both cases the dilution of energy density in the twin sector does not merely reconcile the existence of a mirror Twin Higgs with cosmological constraints, but predicts contributions to cosmological observables that may be probed in current and future CMB experiments. This raises the prospect of discovering evidence of neutral naturalness through cosmology rather than colliders.

44 pages, 12 figures, v2 updated to match published version

References in corpus (8)

• Neutrino mass from Cosmology
• Nnaturalness
• Neutral Naturalness from the Orbifold Higgs
• A Supersymmetric Twin Higgs
• A Holographic Twin Higgs Model
• Chilly Dark Sectors and Asymmetric Reheating
• Minimal Mirror Twin Higgs
• Neutrino constraints: what large-scale structure and CMB data are telling us?

Cited by in corpus (56)

• Probing Physics Beyond the Standard Model: Limits from BBN and the CMB Independently and Combined
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• Cosmological Constraints on Interacting Light Particles
• Freeze-Twin Dark Matter
• Symmetry of Cosmological Observables, and a High Hubble Constant as an Indicator of a Mirror World Dark Sector
• Reconciling Large And Small-Scale Structure In Twin Higgs Models
• Viable Twin Cosmology from Neutrino Mixing
• Signatures of Mirror Stars
• Mirror Twin Higgs Cosmology: Constraints and a Possible Resolution to the $H_0$ and $S_8$ Tensions
• Mirror Neutron Stars
• Mirror QCD phase transition as the origin of the nanohertz Stochastic Gravitational-Wave Background
• Coscattering/Coannihilation Dark Matter in a Fraternal Twin Higgs Model
• Composite Twin Dark Matter
• Precision Tests and Fine Tuning in Twin Higgs Models
• Effective Theory of Flavor for Minimal Mirror Twin Higgs
• Dark radiation constraints on portal interactions with hidden sectors
• Confronting interacting dark radiation scenarios with cosmological data
• Supersymmetric D-term Twin Higgs
• Direct Detection of Mirror Matter in Twin Higgs Models
• Discovering the Twin Higgs Boson with Displaced Decays
• A Predictive Mirror Twin Higgs with Small ${\mathbf{Z}}_2$ Breaking
• Phase Transitions in Twin Higgs Models
• Testing the Scalar Sector of the Twin Higgs Model at Colliders
• Minimal Non-Abelian Supersymmetric Twin Higgs
• Scaling Transformations and the Origins of Light Relics Constraints from Cosmic Microwave Background Observations
• Minimal Neutral Naturalness Model
• Direct Detection of Atomic Dark Matter in White Dwarfs
• Twin Higgs Portal Dark Matter
• Natural Twin Neutralino Dark Matter
• Resurrecting the Fraternal Twin WIMP Miracle
• Breaking Mirror Twin Hypercharge
• Exploring Mirror Twin Higgs Cosmology with Present and Future Weak Lensing Surveys
• Thomson scattering: One rate to rule them all
• Singleton Portals to the Twin Sector
• Spontaneous Twin Symmetry Breaking
• Twin Higgs with Exact $Z_2$
• Cosmology of the Twin Higgs without explicit ${\mathbb{Z}}_2$ breaking
• Collider Signals of the Mirror Twin Higgs through the Hypercharge Portal
• Using LSST Microlensing to Constrain Dark Compact Objects in Spherical and Disk Configurations
• First-order phase transitions in Twin Higgs models
• Baryogenesis through Asymmetric Reheating in the Mirror Twin Higgs
• Twin Quark Dark Matter From Cogenesis
• Twin Cogenesis
• Singularities in the Gravitational Capture of Dark Matter through Long-Range Interactions
• Gegenbauer's Twin
• Charged Dark Matter in Supersymmetric Twin Higgs models
• Dilaton portal in strongly interacting twin Higgs models
• The Type II Dirac Seesaw Portal to the mirror sector: Connecting neutrino masses and a solution to the strong CP problem
• Breaking Mirror Twin Color
• Twin Sterile Neutrino Dark Matter
• Detector-size Upper Bounds on Dark Hadron Lifetime from Cosmology
• TwInflation
• Cool dark sector, concordance, and a low ${\sigma }_8$
• Common Origin of Warm Dark Matter and Dark Radiation
• Review of Neutral Naturalness
• The Lepton Flavor Changing Decays and One-loop Muon Anomalous Magnetic Moment in the Extended Mirror Twin Higgs Models