Unification for darkly charged dark matter

The formation of meta-stable dark matter bound states in coannihilating scenarios could efficiently occur through the scattering with a variety of Standard Model bath particles, where light bosons during the electroweak cross over or even massless photons and gluons are exchanged in the t-channel. The amplitudes for those higher-order processes, however, are divergent in the collinear direction of the in- and out-going bath particles if the mediator is massless. To address the issue of collinear divergences, we derive the bound-state formation collision term in the framework of non-equilibrium quantum field theory. The main result is an expression for a more general cross section, which allows to compute higher-order bound-state formation processes inside the primordial plasma background in a comprehensive manner. Based on this result, we show that next-to-leading order contributions, including the bath-particle scattering, are i) collinear finite and ii) generically dominate over the on-shell emission for temperatures larger than the absolute value of the binding energy. Based on a simplified model, we demonstrate that the impact of these new effects on the thermal relic abundance is significant enough to make it worthwhile to study more realistic coannihilation scenarios.

Section: Jhep09(2020)086mentioning

confidence: 99%

Dark matter bound-state formation at higher order: a non-equilibrium quantum field theory approach

Binder

Blobel

Harz

et al. 2020

“…In analogy to quarkonia, long-range interactions between DM pairs (or co-annihilating partners) can lead to the existence of metastable bound states. Prominent examples where this is indeed the case are electroweak and colored coannihilation scenarios [21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36], and self-interacting DM [37][38][39][40][41][42][43][44][45][46][47][48][49][50][51][52][53]. Bound state effects make it challenging to predict the DM relic abundance on a precise level that matches with the observational percent accuracy [54].…”

Section: Introductionmentioning

confidence: 99%

Non-Abelian electric field correlator at NLO for dark matter relic abundance and quarkonium transport

Binder

Mukaida

Scheihing-Hitschfeld

et al. 2022

We perform a complete next-to-leading order calculation of the non-Abelian electric field correlator in a SU(Nc) plasma, which encodes properties of the plasma relevant for heavy particle bound state formation and dissociation, and is different from the correlator for the heavy quark diffusion coefficient. The calculation is carried out in the real-time formalism of thermal field theory and includes both vacuum and finite temperature contributions. By working in the Rξ gauge, we explicitly show the results are gauge independent, infrared and collinear safe. The renormalization group equation of this electric field correlator is determined by that of the strong coupling constant. Our next-to-leading order calculation can be directly applied to any dipole singlet-adjoint transition of heavy particle pairs. For example, it can be used to describe dissociation and (re)generation of heavy quarkonia inside the quark-gluon plasma well below the melting temperature, as well as heavy dark matter pairs (or charged co-annihilating partners) in the early universe.

“…This way of producing a vector-like fermion mass term dynamically was invoked in refs. [74][75][76] as well.…”

Section: Jhep01(2021)127mentioning

confidence: 99%

“…We call a linear combination of them coupling to Ω+5 ψ −5 and the other orthogonal direction ψ−5 11. The similar gauge structure between the SM and the dark sector was considered in[75,76] in the context of the unification between the two sectors and a strongly interacting DM.…”

mentioning

confidence: 99%

A model of interacting dark matter and dark radiation for H0 and σ8 tensions

Choi

Yanagida

Yokozaki

2021

Self Cite

We present a model describing the dark sector (DS) featured by two interactions remaining efficient until late times in the matter-dominated era after recombination: the interaction among dark radiations (DR), and the interaction between a small fraction of dark matter and dark radiation. The dark sector consists of (1) a dominant component cold collisionless DM (DM1), (2) a sub-dominant cold DM (DM2) and (3) a self-interacting DR. When a sufficient amount of DR is ensured and a few percent of the total DM density is contributed by DM2 interacting with DR, this set-up is known to be able to resolve both the Hubble and σ8 tension. In light of this, we propose a scenario which is logically natural and has an intriguing theoretical structure with a hidden unbroken gauge group SU(5)X ⊗ U(1)X. Our model of the dark sector does not introduce any new scalar field, but contains only massless chiral fermions and gauge fields in the ultraviolet (UV) regime. As such, it introduces a new scale (DM2 mass, mDM2) based on the confinement resulting from the strong dynamics of SU(5)X. Both DM2-DR and DR-DR interactions are attributed to an identical long range interaction of U(1)X. We show that our model can address the cosmological tensions when it is characterized by gX = $$ \mathcal{O} $$ O (10−3)–$$ \mathcal{O} $$ O (10−2), mDM2 = $$ \mathcal{O} $$ O (1)–$$ \mathcal{O} $$ O (100) GeV and TDS/TSM ≃ 0.3–0.4 where gX is the gauge coupling of U(1)X and TDS(TSM) is a temperature of the DS (Standard Model sector). Our model explains candidates of DM2 and DR, and DM1 can be any kind of CDM.