A review of the discovery reach of directional Dark Matter detection

/pdf/refinement-of-the-standard-halo-model-for-dark-matter-20dnqxrjkn.pdf

Refinement of the standard halo model for dark matter searches in light of the Gaia Sausage

Readout technologies for directional WIMP Dark Matter detection

The recently discovered S1 stream passes through the Solar neighborhood on a low inclination, counterrotating orbit The progenitor of S1 is a dwarf galaxy with a total mass comparable to the present-day Fornax dwarf spheroidal, so the stream is expected to have a significant DM component We compute the effects of the S1 stream on WIMP and axion detectors as a function of the density of its unmeasured dark component In WIMP detectors the S1 stream supplies more high energy nuclear recoils so will marginally improve DM detection prospects We find that even if S1 comprises less than 10% of the local density, multiton xenon WIMP detectors can distinguish the S1 stream from the bulk halo in the relatively narrow mass range between 5 and 25 GeV In directional WIMP detectors such as CYGNUS, S1 increases DM detection prospects more substantially since it enhances the anisotropy of the WIMP signal Finally, we show that axion haloscopes possess by far the greatest potential sensitivity to the S1 stream if its dark matter component is sufficiently cold Once the axion mass has been discovered, the distinctive velocity distribution of S1 can easily be extracted from the axion power spectrum

/pdf/dark-matter-hurricane-measuring-the-s1-stream-with-dark-35wo7usuj7.pdf

Dark matter hurricane: Measuring the S1 stream with dark matter detectors

Data from the Gaia satellite show that the solar neighborhood of the Milky Way's stellar halo is imprinted with substructure from several accretion events. Evidence of these events is found in ``the shards,'' stars clustering with high significance in both action space and metallicity. Stars in the shards share a common origin, likely as ancient satellite galaxies of the Milky Way, so will be embedded in dark matter (DM) counterparts. These ``dark shards'' contain two substantial streams (S1 and S2), as well as several retrograde, prograde and lower energy substructures. The retrograde stream S1 has a very high Earth-frame speed of $\ensuremath{\sim}550\text{ }\text{ }\mathrm{km}\text{ }{\mathrm{s}}^{\ensuremath{-}1}$ while S2 moves on a prograde, but highly polar orbit and enhances the peak of the speed distribution at around $300\text{ }\text{ }\mathrm{km}\text{ }{\mathrm{s}}^{\ensuremath{-}1}$. The presence of the dark shards locally leads to modifications of many to the fundamental properties of experimental DM signals. The S2 stream in particular gives rise to an array of effects in searches for axions and in the time dependence of nuclear recoils: shifting the peak day, inducing nonsinusoidal distortions, and increasing the importance of the gravitational focusing of DM by the Sun. Dark shards additionally bring new features for directional signals, while also enhancing the DM flux toward Cygnus.

Velocity substructure from Gaia and direct searches for dark matter

Directional detection of non-baryonic Dark Matter is a promising search strategy for discriminating WIMP events from background ones. This strategy requires both a measurement of the recoil energy down to a few keV and 3D reconstruction of tracks down to a few mm. The MIMAC project, based on a micro-TPC matrix, filled with CF4 and CHF3 is being developed. The first results of a chamber prototype of this matrix, on low energy nuclear recoils (1 H and 19 F) obtained with mono-energetic neutron fields are presented. The discovery potential of this search strategy is illustrated by a realistic case accessible to MIMAC.

MIMAC : A micro-tpc matrix for directional detection of dark matter

Directional detection of non-baryonic DarkMatter is a promising search strategy for discriminating WIMP events from background ones This strategy requires both a measurement of the recoil energy down to a few keV and 3D reconstruction of tracks down to a few mm The MIMAC project, based on a micro-TPC matrix, filled with CF4 and CHF3 is being developed The first results of a chamber prototype of this matrix, on low energy nuclear recoils (1H and 19F) obtained with mono-energetic neutron fields are presented The discovery potential of this search strategy is illustrated by a realistic case accessible to MIMAC

A. Delbart

Papers

MIMAC : A micro-tpc matrix for directional detection of dark matter

MIMAC: A micro-tpc matrix project for directional detection of dark matter