Dark exoplanets

Bai, Yang; Lu, Sida; Orlofsky, Nicholas

doi:10.1103/physrevd.108.103026

Phys. Rev. D

2023

DOI: 10.1103/physrevd.108.103026

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Dark exoplanets

Yang Bai,

Sida Lu,

Nicholas Orlofsky

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2024

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Cited by 2 publications

References 94 publications

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Baryogenesis through asymmetric reheating in the mirror twin Higgs

Alonso-Álvarez,

Curtin,

Rasovic

et al. 2024

J. High Energ. Phys.

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We present the νϕMTH, a Mirror Twin Higgs (MTH) model realizing asymmetric reheating, baryogenesis and twin-baryogenesis through the out-of-equilibrium decay of a right-handed neutrino without any hard $${\mathbb{Z}}_{2}$$ breaking. The MTH is the simplest Neutral Naturalness solution to the little hierarchy problem and predicts the existence of a twin dark sector related to the Standard Model (SM) by a $${\mathbb{Z}}_{2}$$ symmetry that is only softly broken by a higher twin Higgs vacuum expectation value. The asymmetric reheating cools the twin sector compared to the visible one, thus evading cosmological bounds on ∆Neff. The addition of (twin-)colored scalars allows for the generation of the visible baryon asymmetry and, by the virtue of the $${\mathbb{Z}}_{2}$$ symmetry, also results in the generation of a twin baryon asymmetry. We identify a unique scenario with top-philic couplings for the new scalars that can satisfy all cosmological, proton decay and LHC constraints; yield the observed SM baryon asymmetry; and generate a wide range of possible twin baryon DM fractions, from negligible to unity. The viable regime of the theory contains several hints as to the possible structure of the Twin Higgs UV completion. Our results motivate the search for the rich cosmological and astrophysical signatures of twin baryons, and atomic dark matter more generally, at cosmological, galactic and stellar scales.

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Baryogenesis through asymmetric reheating in the mirror twin Higgs

Alonso-Álvarez,

Curtin,

Rasovic

et al. 2024

J. High Energ. Phys.

View full text Add to dashboard Cite

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Gravitational waves from more attractive dark binaries

Bai,

Lu,

Orlofsky

2024

J. Cosmol. Astropart. Phys.

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The detection of gravitational waves (GWs) has led to a deeper understanding of binaries of ordinary astrophysical objects, including neutron stars and black holes. In this work, we point out that binary systems may also exist in a dark sector with astrophysical-mass macroscopic dark matter. These “dark binaries”, when coupled to an additional attractive long-range dark force, may generate a stochastic gravitational wave background (SGWB) with a characteristic spectrum different from ordinary binaries. We find that the SGWB from planet-mass dark binaries is detectable by space- and ground-based GW observatories. The contribution to the SGWB today is smaller from binaries that merge before recombination than after, avoiding constraints on extra radiation degrees of freedom while potentially leaving a detectable GW signal at high frequencies up to tens of GHz.

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Dark exoplanets

Cited by 2 publications

References 94 publications

Baryogenesis through asymmetric reheating in the mirror twin Higgs

Baryogenesis through asymmetric reheating in the mirror twin Higgs

Gravitational waves from more attractive dark binaries

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