Reproductive freeze-in of self-interacting dark matter

March-Russell, John; Tillim, Hannah; West, Stephen M.

doi:10.1103/physrevd.102.083018

Cited by 21 publications

(18 citation statements)

References 46 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Of the potential sources of high-energy cosmic-ray positrons and electrons, one stands out as especially intriguing: the annihilation of Galactic dark matter (see e.g. [5][6][7][8][9][10][11][12][13][14][15]): In many microscopic realizations, dark matter particles can pair annihilate into matter-antimatter pairs, such as positrons and electrons. The annihilation rate, additionally, can be in some cases associated with the observed abundance of dark matter.…”

mentioning

confidence: 99%

Lessons from HAWC pulsar wind nebulae observations: The diffusion constant is not a constant; pulsars remain the likeliest sources of the anomalous positron fraction; cosmic rays are trapped for long periods of time in pockets of inefficient diffusion

et al. 2018

View full text Add to dashboard Cite

Recent TeV observations of nearby pulsars with the HAWC telescope have been interpreted as evidence that diffusion of high-energy electrons and positrons within pulsar wind nebulae is highly inefficient compared to the rest of the interstellar medium. If the diffusion coefficient well outside the nebula is close to the value inferred for the region inside the nebula, high-energy electrons and positrons produced by the two observed pulsars could not contribute significantly to the local measured cosmic-ray flux. The HAWC collaboration thus concluded that, under the assumption of isotropic and homogeneous diffusion, the two pulsars are ruled out as sources of the anomalous high-energy positron flux. Here, we argue that since the diffusion coefficient is likely not spatially homogeneous, the assumption leading to such conclusion is flawed. We solve the diffusion equation with a radially dependent diffusion coefficient, and show that the pulsars observed by HAWC produce potentially perfect matches to the observed high-energy positron fluxes. We also study the implications of inefficient diffusion within pulsar wind nebulae on Galactic scales, and show that cosmic rays are likely to have very long residence times in regions of inefficient diffusion. We describe how this prediction can be tested with studies of the diffuse Galactic emission. possibility has received considerable interest ever since the PAMELA result, but is very tightly constrained by the fact that no associated signal has been observed in gamma rays from dark matter annihilation, for example, in local dwarf spheroidal galaxies [16] or in nearby clusters of galaxies [17] For many years, an alternate, more mundane explanation has also been put forward [5,[18][19][20][21][22][23]23]: that middle-aged (τ ∼ 10 5 − 10 6 yr), nearby pulsars could accelerate, in their magnetosphere and, subsequently, in the surrounding shock with the interstellar medium, (primary) electrons and positrons to very high energy. The energetics of known candidate pulsars, as indicated by the pulsars' spin-down luminosity, is in the correct range to explain the observed excess positrons, as long as (1) the diffusion coefficient is D ∼ D ISM between the pulsar and Earth, and (2) a fraction of O(10%) of the spin-down luminosity is injected in positron-electron pairs [20,23].Recently, the HAWC (High-Altitude Water Cherenkov) Observatory confirmed earlier results from Milagro [24] and HAWC [25] and observed extended TeV emission surrounding two nearby pulsars, Geminga and Monogem (PSR B0656+14), among the candidate sources for the observed anomalous highenergy positrons [26]. As previously noted in [27], the spectrum and morphology from TeV gamma-ray observations can be used to infer features of the underlying high-energy electron-positron population responsible for the up-scattering of photons to TeV energies. In fact, Ref. [27] argued that HAWC observations available at the time [25] were entirely compatible, and actually supported, the hypothesis that the observed excess high-energy...

show abstract

mentioning

confidence: 99%

Lessons from HAWC pulsar wind nebulae observations: The diffusion constant is not a constant; pulsars remain the likeliest sources of the anomalous positron fraction; cosmic rays are trapped for long periods of time in pockets of inefficient diffusion

et al. 2018

View full text Add to dashboard Cite

show abstract

“…If the reheating temperature of the visible sector is sufficiently large, this dark sector can provide the entirety of the DM abundance. In recent literature there has often been a focus on dark sectors produced gravitationally but without additional self-interactions (see however [10,[16][17][18]). In this work, we discuss in contrast interacting approximately conformal field theories (CFTs) coupled through gravity showing that, in many cases, self-interactions allow the dark sector to reach thermal equilibrium with a temperature much lower from that of the visible sector.…”

Section: Jhep05(2021)010mentioning

confidence: 99%

Gravitational production of a conformal dark sector

Redi

Tesi

Tillim

2021

J. High Energ. Phys.

Self Cite

View full text Add to dashboard Cite

Dark sectors with purely gravitational couplings to the Standard Model are unavoidably populated from the SM plasma by graviton exchange, and naturally provide dark matter candidates. We examine the production in the relativistic regime where the dark sector is approximately scale invariant, providing general analytical formulas that depend solely on the central charge of the dark sector. We then assess the relevance of interactions that can lead to a variety of phenomena including thermalisation, non-perturbative mass gaps, out-of-equilibrium phase transitions and cannibalism in the dark sector. As an illustrative example we consider the dark glueball scenario in this light and show it to be a viable dark matter candidate due to the suppression of gravitational production. We go on to extend these results to strongly coupled CFTs and their holographic duals at large-N with the dark dilaton as the dark matter candidate.

show abstract

“…More precisely, here we advocate the use of the effective-range theory as a model-independent way to study the velocity dependence of SIDM. Notice that this approach has been adopted in concrete models of DM before [23][24][25][26][27].…”

Section: Summary and Outlook 13mentioning

confidence: 99%

“…Even though we have assumed that inelastic scatterings -such as DM annihilation or radiative capture [23,24]-are subleading, in principle they can play a role. For instance, in the vanilla light-mediator model, DM typically annihilates into the mediators, leading to a complex potential [76].…”

Section: Inelastic Scatteringsmentioning

confidence: 99%

A Practical and Consistent Parametrization of Dark Matter Self-Interactions

Chu,

Garcia-Cely,

Murayama

2019

Preprint

View full text Add to dashboard Cite

Self-interacting dark matter has been proposed to explain the apparent mass deficit in astrophysical small-scale halos, while observations from galaxy clusters suggest that the corresponding cross section depends on the velocity. Accounting for this is often believed to be highly model-dependent with studies mostly focusing on scenarios with light mediators. Based on the effective-range formalism, in this work we point out a model-independent approach which accurately approximates the velocity dependence of the self-interaction cross section with only two parameters. We illustrate how this parameterization can be simultaneously interpreted in various well-motivated scenarios, including self-interactions induced by Yukawa forces, Breit-Wigner resonances and bound states. We investigate the astrophysical implications and discuss how the approximation can be improved in certain special regimes where it works poorly.

show abstract

Reproductive freeze-in of self-interacting dark matter

Cited by 21 publications

References 46 publications

Lessons from HAWC pulsar wind nebulae observations: The diffusion constant is not a constant; pulsars remain the likeliest sources of the anomalous positron fraction; cosmic rays are trapped for long periods of time in pockets of inefficient diffusion

Lessons from HAWC pulsar wind nebulae observations: The diffusion constant is not a constant; pulsars remain the likeliest sources of the anomalous positron fraction; cosmic rays are trapped for long periods of time in pockets of inefficient diffusion

Gravitational production of a conformal dark sector

A Practical and Consistent Parametrization of Dark Matter Self-Interactions

Contact Info

Product

Resources

About