Chiral Dark Sector

Co, Raymond T.; Harigaya, Keisuke; Nomura, Yasunori

doi:10.1103/physrevlett.118.101801

Cited by 27 publications

(40 citation statements)

References 69 publications

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“…Refs. [65,66], there are now two branches of solutions to the anomaly cancellation conditions. The particle content may either be the trivial Dirac fermions, (2, q 1 ) + (2, −q 1 ) + (2, q 2 ) + (2, −q 2 ), or, the nontrivial (2, q 1 ) + (2, −q 2 ) + (2, −q 1 ) + (2, q 2 ).…”

Section: U (1)mentioning

confidence: 99%

Dark matter and naturalness

Hertzberg

Sandora

2019

J. High Energ. Phys.

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The Standard Model of particle physics is governed by Poincaré symmetry, while all other symmetries, exact or approximate, are essentially dictated by theoretical consistency with the particle spectrum. On the other hand, many models of dark matter exist that rely upon the addition of new added global symmetries in order to stabilize the dark matter particle and/or achieve the correct abundance. In this work we begin a systematic exploration into truly natural models of dark matter, organized by only relativity and quantum mechanics, without the appeal to any additional global symmetries, no fine-tuning, and no small parameters. We begin by reviewing how singlet dark sectors based on spin 0 or spin 1 2 should readily decay, while pure strongly coupled spin 1 models have an overabundance problem. This inevitably leads us to construct chiral models with spin 1 2 particles charged under confining spin 1 particles. This leads to stable dark matter candidates that are analogs of baryons, with a confinement scale that can be naturally O(100)TeV. This leads to the right freeze-out abundance by annihilating into massless unconfined dark fermions. The minimal model involves a dark copy of SU (3) × SU (2) with 1 generation of chiral dark quarks and leptons. The presence of massless dark leptons can potentially give rise to a somewhat large value of ∆N eff during BBN. In order to not upset BBN one may either appeal to a large number of heavy degrees of freedom beyond the Standard Model, or to assume the dark sector has a lower reheat temperature than the visible sector, which is also natural in this framework. This reasoning provides a robust set of dark matter models that are entirely natural. Some are concrete realizations of the nightmare scenario in which dark matter may be very difficult to detect, which may impact future search techniques. *

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Section: U (1)mentioning

confidence: 99%

Dark matter and naturalness

Hertzberg

Sandora

2019

J. High Energ. Phys.

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“…The case with fermions transforming as singlets under G SM (r = 1) and as fundamental representations of G DC = SU(N DC ) (R = F ) was studied in refs. [25,26]. There the dark color gauge group confines in the infrared forming three dark pions, according to the pattern of global symmetry breaking SU(2) × SU(2) → SU(2) V .…”

Section: Jhep02(2021)091mentioning

confidence: 99%

“…The purpose of this work is to study the theories of table 1 with non-trivial SM representations r. Compared to the analysis of refs. [25,26], these models are characterized by less suppressed interactions between the dark and SM sectors, and lead to experimental signatures that are more easily testable. In particular, even though the DM candidate is a singlet under the SM, it has charged partners that can be discovered at colliders.…”

Section: Jhep02(2021)091mentioning

confidence: 99%

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Composite dark matter from strongly-interacting chiral dynamics

Contino

Podo

Revello

2021

J. High Energ. Phys.

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A class of chiral gauge theories is studied with accidentally-stable pseudo Nambu-Goldstone bosons playing the role of dark matter (DM). The gauge group contains a vector-like dark color factor that confines at energies larger than the electroweak scale, and a U(1)D factor that remains weakly coupled and is spontaneously broken. All new scales are generated dynamically, including the DM mass, and the IR dynamics is fully calculable. We analyze minimal models of this kind with dark fermions transforming as non-trivial vector-like representations of the Standard Model (SM) gauge group. In realistic models, the DM candidate is a SM singlet and comes along with charged partners that can be discovered at high-energy colliders. The phenomenology of the lowest-lying new states is thus characterized by correlated predictions for astrophysical observations and laboratory experiments.

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“…"It is not straightforward to construct chiral gauge theories because of anomaly cancellations. Several chiral U (1) models have been investigated in the literature in the last several years [1][2][3][4], and many more have been identified [2,3]. A simple, general procedure for generating chiral U (1) models was discussed in detail in Ref.…”

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confidence: 99%

Dark matter and neutrino mass from the smallest non-Abelian chiral dark sector

et al. 2017

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All pieces of concrete evidence for phenomena outside the standard model (SM)neutrino masses and dark matter -are consistent with the existence of new degrees of freedom that interact very weakly, if at all, with those in the SM. We propose that these new degrees of freedom organize themselves into a simple dark sector, a chiral SU (3) × SU (2) gauge theory with the smallest nontrivial fermion content. Similar to the SM, the dark SU (2) is spontaneously broken while the dark SU (3) confines at low energies. At the renormalizable level, the dark sector contains massless fermions -dark leptons -and stable massive particles -dark protons. We find that dark protons with masses between 10-100 TeV satisfy all current cosmological and astrophysical observations concerning dark matter even if dark protons are a symmetric thermal relic. The dark leptons play the role of right-handed neutrinos and allow simple realizations of the seesaw mechanism or the possibility that neutrinos are Dirac fermions. In the latter case, neutrino masses are also parametrically different from charged-fermion masses and the lightest neutrino is predicted to be massless. Since the new "neutrino" and "dark matter" degrees of freedom interact with one another, these two new-physics phenomena are intertwined. Dark leptons play a nontrivial role in early universe cosmology while indirect searches for dark matter involve, decisively, dark matter annihilations into dark leptons. These, in turn, may lead to observable signatures at high-energy neutrino and gamma-ray observatories, especially once one accounts for the potential Sommerfeld enhancement of the annihilation cross-section, derived from the low-energy dark-sector effective theory, a possibility we explore quantitatively in some Nonzero neutrino masses imply the existence of fundamental particles beyond those that constitute the unreasonably successful standard model of particle physics (SM). The dark matter puzzle also strongly hints at the existence of new particles and new interactions. Both constitute the only unambiguous direct evidence that the SM is incomplete and are, unsurprisingly, the subject of intense theoretical and experimental investigation. Other than the fact that they exist, very little is known about these new degrees of freedom. They have never been directly observed in laboratories and are constrained to be very heavy or very weakly coupled. The "parameter-spaces" for the new physics responsible for nonzero neutrino masses and dark matter are immense. A priori, we don't know if the two problems are related, how the new degrees of freedom interact with the SM degrees of freedom, or how the new degrees of freedom interact with one another.Given the dearth of information, it is very tempting to extract inspiration from the SM. The SM is a chiral gauge theory, spontaneously broken via the Higgs mechanism to SU (3) c ×U (1) EM (strong interactions and electromagnetism). Given the SM gauge group, the particle content is, ignoring the fact there are three generations, minimal. ...

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Chiral Dark Sector

Cited by 27 publications

References 69 publications

Dark matter and naturalness

Dark matter and naturalness

Composite dark matter from strongly-interacting chiral dynamics

Dark matter and neutrino mass from the smallest non-Abelian chiral dark sector

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