arXiv 1102.29582011-02hep-phastro-ph.CO

通过亚稳介质来自太阳中暗物质湮灭的增强中微子信号

Enhanced neutrino signals from dark matter annihilation in the Sun via metastable mediators

Nicole F. Bell, Kalliopi Petraki

备注：: 20 pages, 8 figures
发表信息：: JCAP 1104:003,2011
DOI：: 10.1088/1475-7516/2011/04/003

摘要：

我们计算了太阳中隐蔽的暗物质湮灭产生的中微子信号。在这类模型中，暗物质首先湮灭为亚稳态介质，随后衰变为标准模型粒子。如果介质的寿命很长，它们将在衰变之前从致密的太阳核心传播出去。高能中微子在太阳中被吸收。在中微子直接在太阳中心产生的标准情况下，吸收与E > 100 GeV有关，导致超过E ~ 1 TeV的中微子光谱受到显著抑制。在与世隔绝的暗物质场景中，中微子信号被大大增强，因为中微子以较低的密度从核心注入。由于太阳密度随半径呈指数下降，亚稳态介质对中微子通量有显着影响，即使衰变长度与太阳半径相比很小。此外，由于中微子探测的截面随能量的增加而增加，中微子光谱高能区的增强将对整个事件发生率产生很大的影响。

英文摘要：

We calculate the neutrino signal resulting from annihilation of secluded dark matter in the Sun. In this class of models, dark matter annihilates first into metastable mediators, which subsequently decay into Standard Model particles. If the mediators are long lived, they will propagate out from the dense solar core before decaying. High energy neutrinos undergo absorption in the Sun. In the standard scenario in which neutrinos are produced directly in the centre of the Sun, absorption is relevant for E > 100 GeV, resulting in a significant suppression of the neutrino spectrum beyond E ~ 1 TeV. In the secluded dark matter scenario, the neutrino signal is greatly enhanced because neutrinos are injected away from the core, at lower density. Since the solar density falls exponentially with radius, metastable mediators have a significant effect on the neutrino flux, even for decay lengths which are small compared to the solar radius. Moreover, since neutrino detection cross sections grow with energy, this enhancement of the high energy region of the neutrino spectrum would have a large effect on overall event rates.

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