Continuum-mediated self-interacting dark matter

Chaffey, Ian; Fichet, S.; Tañedo, Philip

doi:10.1007/jhep06(2021)008

“…Since there is no apparent discrepancy with cold dark matter on the scales of massive galaxies or groups (with v  10 2 km s −1 ) and clusters of galaxies (with v ∼ 10 3 km s −1 ), Loeb & Weiner (2011) proposed a decade ago that the interaction might be mediated by a Yukawa potential, declining inversely with velocity to the fourth power, ∝v −4 , as expected in some dark sector extensions to the standard model of particle physics (see also Chaffey et al 2021). Most recently, velocity-dependent cross sections with values 5 cm 2 g −1 at v  10 km s −1 were motivated to explain the dynamical properties of Milky Way satellites (Silverman et al 2022), but with the provision that the interaction must drop sharply with velocity to =1 cm 2 g −1 in massive systems (Kaplinghat et al 2016;Sankar Ray et al 2022).…”

Section: Introductionmentioning

confidence: 81%

Effective Self-interaction of Dark Matter from Gravitational Scattering

Loeb¹

2022

ApJL

4

0

View full text Add to dashboard Cite

I show that gravitational scattering of dark matter objects of mass ∼104 M ⊙ and speeds of ∼10 km s−1, provides the cross section per unit mass required in self-interacting dark matter models that alleviate the small-scale structure challenges to the collisionless cold dark matter model. For primordial objects of mass 104 M 4 M ⊙, moving at the velocity dispersion characteristic of dwarf galaxies, 10v 1 km s−1, the cross section per unit mass for gravitational scattering is ∼ 10 ( M 4 / v 1 4 ) cm 2 g − 1 . The steep decline in interaction with increasing velocity explains why self-interaction is not evident in data on massive galaxies and clusters of galaxies.

show abstract

“…There are numerous other DM models based on conformal sectors which go beyond the canonical paradigm of WIMP DM in a composite Higgs setting. These include conformal freeze-in [30][31][32][33], continuum dark matter [34][35][36][37] and other models featuring continua [38][39][40][41], freeze-in from warped extra dimensions [42][43][44][45][46][47], dilaton-mediated models [48][49][50][51][52], and others [53][54][55][56]. Some of the freeze-in models accommodate light DM candidates, but to our knowledge, our model is the first example of light conformal DM with a thermal dark sector.…”

Section: Jhep11(2023)186mentioning

confidence: 99%

Forbidden conformal dark matter at a GeV

Ferrante,

Ismail,

Lee

et al. 2023

J. High Energ. Phys.

4

0

View full text Add to dashboard Cite

We introduce a model of dark matter (DM) where the DM is a composite of a spontaneously broken conformal field theory. The DM is a thermal relic with its abundance determined by the freeze-out of annihilations to dilatons, the Goldstone boson of broken conformal symmetry. If the dilaton is heavier than the DM this is an example of forbidden DM. We explore the phenomenology of this model in its 5D dual description, corresponding to a warped extra dimension with the Standard Model on the ultraviolet brane and the DM on the infrared brane. We find the model is compatible with theoretical and experimental constraints for DM masses in the 0.1–10 GeV range. The conformal phase transition is supercooled and strongly first-order. It can source large stochastic gravitational wave signals consistent with those recently observed at pulsar timing arrays like NANOGrav. The majority of the viable parameter space will be probed by future detectors designed to search for long-lived particles, including most of the region favored by the NANOGrav signal. The rest of the parameter space can be probed at future direct detection experiments.

show abstract

“…For other phenomenological applications in particle physics, it would be interesting to study the couplings of the continuum KK modes with the SM fields, and provide values for the Wilson coefficients of the corresponding effective field theory. Other possible applications include the study of dark matter as a weakly interacting continuum [16,52]. Some of these issues will be addressed in a forthcoming publication [49].…”

Section: Jhep09(2021)157mentioning

confidence: 99%

Analytical Green’s functions for continuum spectra

Megías

¹

,

Quirós

²

2021

J. High Energ. Phys.

View full text Add to dashboard Cite

Green’s functions with continuum spectra are a way of avoiding the strong bounds on new physics from the absence of new narrow resonances in experimental data. We model such a situation with a five-dimensional model with two branes along the extra dimension z, the ultraviolet (UV) and the infrared (IR) one, such that the metric between the UV and the IR brane is AdS5, thus solving the hierarchy problem, and beyond the IR brane the metric is that of a linear dilaton model, which extends to z → ∞. This simplified metric, which can be considered as an approximation of a more complicated (and smooth) one, leads to analytical Green’s functions (with a mass gap mg ∼ TeV and a continuum for s >$$ {m}_g^2 $$ m g 2 ) which could then be easily incorporated in the experimental codes. The theory contains Standard Model gauge bosons in the bulk with Neumann boundary conditions in the UV brane. To cope with electroweak observables the theory is also endowed with an extra custodial gauge symmetry in the bulk, with gauge bosons with Dirichlet boundary conditions in the UV brane, and without zero (massless) modes. All Green’s functions have analytical expressions and exhibit poles in the second Riemann sheet of the complex plane at s = $$ {M}_n^2 $$ M n 2 − iMnΓn, denoting a discrete (infinite) set of broad resonances with masses (Mn) and widths (Γn). For gauge bosons with Neumann or Dirichlet boundary conditions, the masses and widths of resonances satisfy the (approximate) equation s = −4$$ {m}_g^2{\mathcal{W}}_n^2 $$ m g 2 W n 2 [±(1 + i)/4], where $$ \mathcal{W} $$ W n is the n-th branch of the Lambert function.

show abstract

Continuum-mediated self-interacting dark matter

Cited by 18 publications

References 70 publications

Effective Self-interaction of Dark Matter from Gravitational Scattering

Effective Self-interaction of Dark Matter from Gravitational Scattering

Forbidden conformal dark matter at a GeV

Analytical Green’s functions for continuum spectra

Contact Info

Product

Resources

About