Caustics, Cold Flows, and Annual Modulation

Natarajan, Aravind

doi:10.1155/2011/285346

Cited by 5 publications

(5 citation statements)

References 60 publications

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“…Reconstructing the stream parameters for arbitrary dark matter streams using a combination of the percentage modulation and the total number of recoils will enable us to understand the phase space distribution of dark matter in the solar neighborhood. In previous work [3,4], we showed that streams can alter the phase and structure of the annual modulation. In certain energy bins, the presence of the stream may only be apparent during part of the year, when the stream speed relative to the earth is largest.…”

Section: Discussionmentioning

confidence: 87%

“…For sufficiently large exposures, the annual modulation provides additional information. The annual modulation is an excellent indicator of streams [3,4], and should reveal the presence of the stream at a measured energy near the cutoff energy of the stream. Reconstructing the stream parameters for arbitrary dark matter streams using a combination of the percentage modulation and the total number of recoils will enable us to understand the phase space distribution of dark matter in the solar neighborhood.…”

Section: Discussionmentioning

confidence: 99%

“…Direct detection experiments are sensitive to the form of the local dark matter velocity distribution [3][4][5][6], and the results may be significantly modified if a cold stream of dark matter particles exists in the solar neighborhood. Tidal disruption of dwarf satellites is expected to produce * Electronic address: anat@andrew.cmu.edu † Electronic address: savage@fysik.su.se ‡ Electronic address: ktfreese@umich.edu such cold streams.…”

Section: Introductionmentioning

confidence: 99%

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Probing dark matter streams with CoGeNT

Savage

Freese

2011

Phys. Rev. D

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We examine the future sensitivity of CoGeNT to the presence of dark matter streams and find that consideration of streams in the data may lead to differences in the interpretation of the results. We show the allowed particle mass and cross section for different halo parameters, assuming spinindependent elastic scattering. As an example, we choose a stream with the same velocity profile as that of the Sagittarius stream (and in the Solar neighborhood) and find that, with an exposure of ∼ 10 kg year, the CoGeNT results can be expected to exclude the SHM-only halo in favor of an SHM+stream halo at the 95% (99.7%) confidence level provided the stream contributes 3% (5%) of the local dark matter density. The presence of a significant stream component may result in incorrect estimates of the particle mass and cross section unless the presence of the stream is taken into account. We conclude that the CoGeNT experiment is sensitive to streams and care should be taken to include the possibility of streams when analyzing experimental results.

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Section: Discussionmentioning

confidence: 87%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Probing dark matter streams with CoGeNT

Savage

Freese

2011

Phys. Rev. D

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“…Such flows are predicted, for example, by models of late infall of non-virialized DM into the the Galactic halo. These streams will typically have much smaller velocity dispersion than the virialized DM [27][28][29].…”

Section: Jcap06(2014)059mentioning

confidence: 99%

Direct and indirect detection of dissipative dark matter

Fan

Katz

Shelton

2014

J. Cosmol. Astropart. Phys.

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We study the constraints from direct detection and solar capture on dark matter scenarios with a subdominant dissipative component. This dissipative dark matter component in general has both a symmetric and asymmetric relic abundance. Dissipative dynamics allow this subdominant dark matter component to cool, resulting in its partial or total collapse into a smaller volume inside the halo (e.g., a dark disk) as well as a reduced thermal velocity dispersion compared to that of normal cold dark matter. We first show that these features considerably relax the limits from direct detection experiments on the couplings between standard model (SM) particles and dissipative dark matter. On the other hand, indirect detection of the annihilation of the symmetric dissipative dark matter component inside the Sun sets stringent and robust constraints on the properties of the dissipative dark matter. In particular, IceCube observations force dissipative dark matter particles with mass above 50 GeV to either have a small coupling to the SM or a low local density in the solar system, or to have a nearly asymmetric relic abundance. Possible helioseismology signals associated with purely asymmetric dissipative dark matter are discussed, with no present constraints.

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“…The existence of caustics is relevant to the DAMA experiment since the velocity distribution in the vicinity of a dark matter inner caustic is dominated by the cold flow forming the caustic. In [29], the effect of the dominant flow of the self similar model on the annual modulation signature was calculated. The effect of other cold streams on the recoil rate has been discussed by several authors (see for example [30][31][32][33][34] [14,35] (In [14], a value of ξ = 0.733 is adopted).…”

Section: A Discrete Flows and Causticsmentioning

confidence: 99%

DAMA and the self-similar infall halo model

Natarajan

2011

Phys. Rev. D

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The annual modulation in the rate of WIMP recoils observed by the DAMA collaboration at high significance is often analyzed in the context of an isothermal Maxwell-Boltzmann velocity distribution. While this is the simplest model, there is a need to consider other well motivated theories of halo formation. In this paper, we study a different halo model, that of self similar infall which is characterized by the presence of a number of cold streams and caustics, not seen in simulations. It is shown that the self similar infall model is consistent with the DAMA result both in amplitude and in phase, for WIMP masses exceeding ≈ 250 GeV at the 99.7% confidence level. Adding a small thermal component makes the parameter space near m χ = 12 GeV consistent with the self similar model. The minimum χ 2 per degree of freedom is found to be 0.92(1.03) with(without) channeling taken into account, indicating an acceptable fit. For WIMP masses much greater than the mass of the target nucleus, the recoil rate depends only on the ratio σ p /m χ which is found to be ≈ 0.06 femtobarn/TeV. However as in the case of the isothermal halo, the allowed parameter space is inconsistent with the null result obtained by the CDMS and Xenon experiments for spin-independent elastic scattering. Future experiments with directional sensitivity and mass bounds from accelerator experiments will help to distinguish between different halo models and/or constrain the contribution from cold flows. * Electronic address: anat@andrew.cmu.edu 1 arXiv:1011.3966v2 [astro-ph.CO]

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Caustics, Cold Flows, and Annual Modulation

Cited by 5 publications

References 60 publications

Probing dark matter streams with CoGeNT

Probing dark matter streams with CoGeNT

Direct and indirect detection of dissipative dark matter

DAMA and the self-similar infall halo model

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