Dark spectroscopy at lepton colliders

Hochberg, Yonit; Kuflik, Eric; Murayama, Hitoshi

doi:10.1103/physrevd.97.055030

Cited by 25 publications

(20 citation statements)

References 66 publications

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“…In recent years there has been great interest in dark matter (DM) models with modified thermal histories, where DM annihilation is still responsible for setting the late-time abundance of DM, but the annihilation involves three or more DM (or DM-like) particles (e.g. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17]). This pushes the preferred mass scale for the DM below 1 GeV [2], a range of interest for novel direct detection searches (see e.g.…”

Section: Introductionmentioning

confidence: 99%

Enhanced n-body annihilation of dark matter and its indirect signatures

Namjoo

Slatyer

2019

J. High Energ. Phys.

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We examine the possible indirect signatures of dark matter annihilation processes with a non-standard scaling with the dark matter density, and in particular the case where more than two dark matter particles participate in the annihilation process. We point out that such processes can be strongly enhanced at low velocities without violating unitarity, similar to Sommerfeld enhancement in the standard case of two-body annihilation, potentially leading to visible signals in indirect searches. We study in detail the impact of such multibody annihilations on the ionization history of the universe and consequently the cosmic microwave background, and find that unlike in the two-body case, the dominant signal can naturally arise from the end of the cosmic dark ages, after the onset of structure formation. We examine the complementary constraints from the Galactic Center, Galactic halo, and galaxy clusters, and outline the circumstances under which each search would give rise to the strongest constraints. We also show that if there is a population of ultra-compact dense dark matter clumps present in the Milky Way with sufficiently steep density profile, then it might be possible to detect point sources illuminated by multi-body annihilation, even if there is no large low-velocity enhancement. Finally, we provide a case study of a model where 3-body annihilation dominates the freezeout process, and in particular the resonant regime where a large low-velocity enhancement is naturally generated. arXiv:1810.09455v1 [astro-ph.CO] 22 Oct 2018 m 2 Pl ρ r ∼ 1 m 2 Pl g * T 4 , whereρ r = (π 2 /30)g * T 4 is the radiation energy density (g * counts the number of relativistic degrees of freedom as usual), i.e. H ∼ g 1/2 * T 2 /m Pl . Thus the criterion for freezeout becomes (g * )

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Section: Introductionmentioning

confidence: 99%

Enhanced n-body annihilation of dark matter and its indirect signatures

Namjoo

Slatyer

2019

J. High Energ. Phys.

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“…While phantom fields have been employed frequently in cosmology in recent years, since they give rise to an accelerated expansion of the Universe [16], it was also pointed out [17][18][19][20][21][22][23], that the presence of a phantom field can be evaded in the construction of wormholes, when gravity theories with higher curvature terms are considered.…”

Section: Introductionmentioning

confidence: 99%

“…Such a phantom field carries the wrong sign in front of its kinetic term, and consequently its energy-momentum tensor violates the null energy condition. The conditions for the existence of traversable wormholes as well as the properties of such static wormholes were discussed later in detail by Morris and Thorne [14], who addressed also the possibility of time-travel [15].While phantom fields have been employed frequently in cosmology in recent years, since they give rise to an accelerated expansion of the Universe [16], it was also pointed out [17][18][19][20][21][22][23], that the presence of a phantom field can be evaded in the construction of wormholes, when gravity theories with higher curvature terms are considered.Wormholes have also been considered from an astrophysical point of view, since they represent hypothetical objects that can be searched for observationally [24][25][26]. Cramer et al [27] and Perlick [28], for instance, have investigated wormholes as gravitational lenses, Tsukamoto et al have addressed the Einstein rings of wormholes [29], Bambi [30] and Nedkova et al [31] have studied the shadow of wormholes, while Zhou et al [32] determined the iron line profile in the X-ray reflected spectrum of a thin accretion disk around wormholes.…”

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confidence: 99%

Geometry of spinning Ellis wormholes

2016

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We give a detailed account of the properties of spinning Ellis wormholes, supported by a phantom field. The general set of solutions depends on three parameters, associated with the size of the throat, the rotation and the symmetry of the solutions. For symmetric wormholes the global charges possess the same values in both asymptotic regions, while this is no longer the case for non-symmetric wormholes. We present mass formulae for these wormholes, study their quadrupole moments, and discuss the geometry of their throat and their ergoregion. We demonstrate, that these wormholes possess limiting configurations corresponding to an extremal Kerr black hole. Moreover, we analyze the geodesics of these wormholes, and show that they possess bound orbits.

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“…For a study showing what can be learned about the mass spectrum at a future e + e − collider, see[46,57].…”

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confidence: 99%

LHC searches for dark sector showers

Cohen

Lisanti

Lou

et al. 2017

J. High Energ. Phys.

118

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This paper proposes a new search program for dark sector parton showers at the Large Hadron Collider (LHC). These signatures arise in theories characterized by strong dynamics in a hidden sector, such as Hidden Valley models. A dark parton shower can be composed of both invisible dark matter particles as well as dark sector states that decay to Standard Model particles via a portal. The focus here is on the specific case of 'semi-visible jets,' jet-like collider objects where the visible states in the shower are Standard Model hadrons. We present a Simplified Modellike parametrization for the LHC observables and propose targeted inclusive search strategies for regions of parameter space that are not covered by existing analyses. Following the 'mono-X' literature, the portal is modeled using either an effective field theoretic contact operator approach or with one of two ultraviolet completions; sensitivity projections are provided for all three cases. We additionally highlight that the LHC has a unique advantage over direct detection experiments in the search for this class of dark matter theories. arXiv:1707.05326v2 [hep-ph]

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Dark spectroscopy at lepton colliders

Cited by 25 publications

References 66 publications

Enhanced n-body annihilation of dark matter and its indirect signatures

Enhanced n-body annihilation of dark matter and its indirect signatures

Geometry of spinning Ellis wormholes

LHC searches for dark sector showers

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