Phenomenological constraints on axion models of dynamical dark matter

Thomas, Brooks

doi:10.1103/physrevd.86.055013

Cited by 41 publications

(63 citation statements)

References 107 publications

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“…Moreover, as discussed in Refs. [1][2][3], these particles χ n exhibit a broad spectrum of decay widths Γ n which scale inversely with their corresponding cosmological abundances Ω n . As a result of these different decay widths, different χ n may manifest themselves in qualitatively different ways at colliderseven in situations in which the χ n all have similar quantum numbers and are therefore produced via similar processes.…”

Section: Dynamical Dark Matter At the Lhc: General Considerationsmentioning

confidence: 99%

“…As discussed in Ref. [3], a wide variety of DDM scenarios generically give rise to observable excesses in both classes of channels simultaneously. However, in a variety of other DDM contexts, such correlations among channels may not be possible due to the particulars of the model and the lifetimes of the constituent fields in the ensemble.…”

Section: Introductionmentioning

confidence: 99%

“…This new framework is called "dynamical dark matter" (DDM), and previous discussions of DDM have focused on its overall theoretical properties [1] as well as on the theoretical and phenomenological implications of a specific model [2,3] that was constructed within this new framework. In this paper, we shall return to consideration of the general DDM framework as a whole, and discuss the detection prospects for a broad class of DDM models at colliders, and in particular at the Large Hadron Collider (LHC).…”

Section: Introductionmentioning

confidence: 99%

“…Indeed, as discussed in Refs. [2,3], this balancing represents a novel way of satisfying phenomenological bounds on the dark sector without imposing stability as a whole, and ultimately represents the most general dark sector that can be imagined.…”

Section: Introductionmentioning

confidence: 99%

“…One such strategy, which was discussed in Ref. [3], is to search for correlations between / E T signatures and signals in other channels to which the DDM ensemble might simultaneously give rise -channels not normally associated with dark matter. Indeed, in DDM models, only those portions of the DDM ensemble which are stable on collider time scales contribute to missing-energy signals at colliders.…”

Section: Introductionmentioning

confidence: 99%

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Distinguishing dynamical dark matter at the LHC

Thomas

2012

Phys. Rev. D

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Dynamical dark matter (DDM) is a new framework for dark-matter physics in which the dark sector comprises an ensemble of individual component fields which collectively conspire to act in ways that transcend those normally associated with dark matter. Because of its non-trivial structure, this DDM ensemble -unlike most traditional dark-matter candidates -cannot be characterized in terms of a single mass, decay width, or set of scattering cross-sections, but must instead be described by parameters which describe the collective behavior of its constituents. Likewise, the components of such an ensemble need not be stable so long as lifetimes are balanced against cosmological abundances across the ensemble as a whole. In this paper, we investigate the prospects for identifying a DDM ensemble at the LHC and for distinguishing such a dark-matter candidate from the candidates characteristic of traditional dark-matter models. In particular, we focus on DDM scenarios in which the component fields of the ensemble are produced at colliders alongside some number of Standard-Model particles via the decays of additional heavy fields. The invariant-mass distributions of these Standard-Model particles turn out to possess several unique features that cannot be replicated in most traditional dark-matter models. We demonstrate that in many situations it is possible to differentiate between a DDM ensemble and a traditional dark-matter candidate on the basis of such distributions. Moreover, many of our results also apply more generally to a variety of other extensions of the Standard Model which involve multiple stable or metastable neutral particles.

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Section: Dynamical Dark Matter At the Lhc: General Considerationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Distinguishing dynamical dark matter at the LHC

Thomas

2012

Phys. Rev. D

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Analytic study of dark photon and gravitational wave production from axion

Salehian

Gorji

Mukohyama

et al. 2021

J. High Energ. Phys.

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Axion-like fields heavier than about 10−27 eV are expected to oscillate in the radiation dominated epoch when the Hubble parameter drops below their mass. Considering the Chern-Simons coupling with a dark gauge boson, large amount of dark photons are produced during a short time interval through tachyonic resonance instability. The produced dark photons then source gravitational tensor modes leading to chiral gravitational waves. Through this process, one can indirectly probe a large parameter space of coupled axion-dark photon models. In this work we first find an analytic expression for the number density of the dark photons produced during the tachyonic resonance regime. Second, by using the saddle point approximation we find an analytic expression for the gravitational wave spectrum in terms of the mass, coupling and misalignment angle. Our analytic results can be used for the observational analysis of these types of scenarios.

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Spheres to jets tuning event shapes with 5d simplified models

Cesarotti

Reece

Strassler

2021

J. High Energ. Phys.

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Hidden sectors could give rise to a wide variety of events at the LHC. Confining hidden sectors are known to engender events with a small number of jets when they are weakly-coupled at high energies, and quasi-spherical soft unclustered energy patterns (SUEPs) when they are very strongly-coupled (large ‘t Hooft coupling) at high energies. The intermediate regime is murky, and could give rise to signals hiding from existing search strategies. While the intermediate coupling regime is not calculable, it is possible to pursue a phenomenological approach in which one creates signals that are intermediate between spherical and jetty. We propose a strategy for generating events of this type using simplified models in extra dimensions. The degree to which the event looks spherical is related to the number of decays produced near kinematic threshold. We provide an analytic understanding of how this is determined by parameters of the model. To quantify the shape of events produced with this model, we use a recently proposed observable — event isotropy — which is a better probe of the spherical regime than earlier event shape observables.

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Phenomenological constraints on axion models of dynamical dark matter

Cited by 41 publications

References 107 publications

Distinguishing dynamical dark matter at the LHC

Distinguishing dynamical dark matter at the LHC

Analytic study of dark photon and gravitational wave production from axion

Spheres to jets tuning event shapes with 5d simplified models

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