發(fā)布時間：2019-03-02 12:28

【摘要】：本文從介紹星系團(tuán)中暗物質(zhì)的發(fā)現(xiàn)開始，指出非重子暗物質(zhì)構(gòu)成整個宇宙中暗物質(zhì)的主要部分，，在幾種暗物質(zhì)模型中，超對稱理論所提出的WIMP候選者中性微子，成為現(xiàn)在暗物質(zhì)直接探測實驗最為關(guān)注的模型之一。在基于對中性微子參數(shù)的實驗計算中，包含了探測器本身的技術(shù)原因的限定，即能量探測效率、探測閾值、能量分辨率以及本底處理方法，也包含了宇宙學(xué)參數(shù)及模型的不確定性。在較詳細(xì)地計算分析了這些因素對于暗物質(zhì)直接探測結(jié)果的影響之后，又在假定各實驗組本底分析無誤的前提下，給出了依據(jù)實驗結(jié)果對WIMP參數(shù)進(jìn)行計算的具體方法，指出現(xiàn)在普遍采用的簡化的計算方法帶有主觀性后，本文最后的章節(jié)從WIMP-靶核與自旋無關(guān)及與自旋相關(guān)的不同作用方式來分類，詳細(xì)給出了更為一般地與作用模型無關(guān)的WIMP-核子耦合系數(shù)的計算方法。并使用這一方法，重新分析了現(xiàn)有直接探測實驗間宣布的相互沖突的WIMP參數(shù)結(jié)果，得出結(jié)論：在自旋無關(guān)的作用下，并無法調(diào)和現(xiàn)有的探測結(jié)果間的矛盾，而在自旋相關(guān)的作用模式下，可以完全排除直接探測實驗所宣布的疑似暗物質(zhì)信號。因此，尚無確鑿證據(jù)表明直接探測實驗已發(fā)現(xiàn)了暗物質(zhì)存在的證據(jù)。本文所給出的關(guān)于WIMP參數(shù)的具體計算方法，在被用于直接探測實驗間結(jié)果的比較上避免了對作用模型的人為限制。
[Abstract]:Starting with the discovery of dark matter in galaxy clusters, this paper points out that non-baryonic dark matter constitutes the main part of dark matter in the whole universe. In several dark matter models, the WIMP candidate neutral neutrino proposed by supersymmetry theory, It has become one of the most concerned models in the direct detection experiment of dark matter. In the experimental calculation based on neutral neutrino parameters, the technical reasons of the detector itself are defined, that is, energy detection efficiency, detection threshold, energy resolution and background processing method. The uncertainties of cosmological parameters and models are also included. After more detailed calculation and analysis of the influence of these factors on the results of direct detection of dark matter, and assuming that the background analysis of each experimental group is correct, the concrete method for calculating the WIMP parameters according to the experimental results is given. After pointing out that the simplified calculation method is subjective, the final chapter of this paper classifies the WIMP- target nuclei from different spin-independent and spin-dependent modes of action. The calculation method of the coupling coefficient of WIMP- nucleon, which is more generally independent of the interaction model, is given in detail. By using this method, the results of conflicting WIMP parameters announced between the existing direct detection experiments are re-analyzed, and the conclusion is drawn: under the spin-independent action, the contradiction between the existing detection results cannot be reconciled. In the spin-dependent mode of action, the suspected dark matter signals announced by the direct detection experiment can be completely excluded. Therefore, there is no conclusive evidence that direct detection experiments have found evidence of the existence of dark matter. The concrete calculation method of WIMP parameters given in this paper avoids the artificial restriction on the interaction model in the comparison of the results obtained from the direct detection experiments.
【學(xué)位授予單位】：上海交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：P145.9

【共引文獻(xiàn)】

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