A Hidden Valley model of cold dark matter with photonic portal

Again on hidden sector of the Universe, accessible through photonic portal

We describe more precisely the mechanism of spontaneous mass generation in the previously proposed model of hidden sector of the Universe. The hidden sector is conjectured to consist of sterile spin-1/2 fermions (sterinos) whose mass is spontaneously generated by sterile scalar bosons (sterons), while their interactions are mediated by sterile antisymmetric-tensor bosons (A bosons). Such a sector communicates with the familiar Standard Model sector through a photonic portal acting weakly between both sectors (but stronger than the universal gravity). This is due to photons which, beside sterin…

Hypothesis of photonic portal in the problem of dark matter and classical nature of gravitation

Within our model of "photonic portal" to the hypothetical hidden sector of the Universe, an option is considered, where the massive sterile bosons, mediating in this sector and described by the antisymmetric-tensor field A_{μν} (of dimension one), are gauged by a vector field χ_μ(of dimension zero). When the Einsteinian gravity is switched on into this model, then it is argued that the metric g_{μν}(x) of spacetime is proportional to <χ_μ(x) χ_ν(x)>_{vac}, being in this way classical in its nature, not the subject of quantization within an overall quantum theory including gravitation. A Lagran…

Photonic dark matter portal revisited

In our previous paper [1], we studied a model of dark matter (DM) in which the hidden sector interacts with standard model particles via a hidden photonic portal (HP). We investigated the effects of this new interaction on the hydrogen atom and obtained an upper bound for the coupling of the model. In this work, we study the effects of HP on two interesting exotic atoms namely muonium and positronium. We obtain a tighter upper limit on the coupling. We also calculate the change (shift) in the Aharonov-Bohm phase due to HP and find that the phase shift is negligibly small (for DM particles mass…

Photonic portal to the sterile world of cold dark matter

We assume that the cold dark matter consists of spin-1/2 and spin-0 particles described by a bispinor field ψand a scalar field ϕ, sterile from all Standard Model charges (in contrast, neutralinos, supersymmetric candidates for cold dark matter, are not sterile from weak Standard Model charges). We propose, however, that such a sterile world can contact with our Standard Model world not only through gravity but also through a portal provided by photons coupled to sterile particles by means of two very weak effective interactions -(f/M^2)ϕF^{μν}ϕF_{μν} and -(f'/M^2) (\barψσ^{μν} ψ)ϕF_{μν}, wher…

Black Hole Portal into Hidden Valleys

Superradiant instability turns rotating astrophysical black holes into unique probes of light axions. We consider what happens when a light axion is coupled to a strongly coupled hidden gauge sector. In this case superradiance results in an adiabatic increase of a hidden sector CP-violating $θ$-parameter in a near horizon region. This may trigger a first order phase transition in the gauge sector. As a result a significant fraction of a black hole mass is released as a cloud of hidden mesons and can be later converted into electromagnetic radiation. This results in a violent electromagnetic bu…

Photonic dark matter portal and quantum physics

We study a model of dark matter in which the hidden sector interacts with standard model particles via a hidden photonic portal. We investigate the effects of this new interaction on the hydrogen atom, including the Stark, Zeeman and hyperfine effects. Using the accuracy of the measurement of energy, we obtain an upper bound for the coupling constant of the model. We also calculate the contribution from the hidden photonic portal to the anomalous magnetic moment of the muon, which provides an important probe of physics beyond the standard model.

Higgs portal valleys, stability and inflation

The measured values of the Higgs and top quark masses imply that the Standard Model potential is very likely to be unstable at large Higgs values. This is particularly problematic during inflation, which sources large perturbations of the Higgs. The instability could be cured by a threshold effect induced by a scalar with a large vacuum expectation value and directly connected to the Standard Model through a Higgs portal coupling. However, we find that in a minimal model in which the scalar generates inflation, this mechanism does not stabilize the potential because the mass required for infla…

A new weak-isospin triplet of scalars and "electroweak portal" to hidden sector of the Universe

A new weak-isospin triplet of scalar bosons is introduced to the Standard Model in order to ensure the electroweak symmetry for a conjectured new weak coupling between a hidden sector of the Universe, responsible for cold dark matter, and the Standard-Model sector (involving now the new triplet). The considered coupling may be called "electroweak portal" to the structure of hidden sector. After spontaneously breaking the electroweak symmetry by the Standard-Model Higgs mechanism, it includes the so called "photonic portal" introduced by us previously.

Is the electromagnetic field a source of a mediating field in hidden sector?

We continue the discussion of a proposed model of hidden sector of the Universe, consisting of sterile spin-1/2 Dirac fermions ("sterinos"), sterile spin-0 bosons ("sterons") with spontaneously nonzero vacuum expectation value, and sterile nongauge mediating bosons ("A bosons") described by an antisymmetric-tensor field (of dimension one). The Standard-Model electromagnetic field (of dimension two) multiplied by the steron vacuum expectation value becomes in a spontaneous way a source of A-boson field mediating new weak interactions in hidden sector and providing - due to the action of electro…

Heavy Dark Matter Through the Higgs Portal

Motivated by Higgs Portal and Hidden Valley models, heavy particle dark matter that communicates with the supersymmetric Standard Model via pure Higgs sector interactions is considered. We show that a thermal relic abundance consistent with the measured density of dark matter is possible for masses up to $\sim 30\tev$. For dark matter masses above $\sim 1\tev$, non-perturbative Sommerfeld corrections to the annihilation rate are large, and have the potential to greatly affect indirect detection signals. For large dark matter masses, the Higgs-dark-matter-sector couplings are large and we show …

Building a Stückelberg Portal

We construct explicit string theory models realizing the recently proposed "Stückelberg Portal" scenario, a framework for building Z' mediation models without the need to introduce unwanted exotic matter charged under the Standard Model. This scenario can be viewed purely field-theoretically, although it is particularly well motivated from string theory. By analyzing carefully the Stückelberg couplings between the Abelian gauge bosons and the RR axions, we construct the first global intersecting brane models which extend the Standard Model with a genuine hidden sector, to which it is nonethele…

暗物质湮灭成暗胶球的间接探测

Indirect Detection of Dark Matter Annihilating into Dark Glueballs

本研究利用GlueShower代码首次对暗物质通过暗胶球湮灭至标准模型的过程施加多通道约束，并展示了其解释银河系中心超出的能力及对隐谷理论紫外/红外细节的诊断潜力。