用于山脉中高能中微子探测的切伦科夫望远镜阵列

Search for dark matter with IACTs and the Cherenkov Telescope Array

In the last decades an incredible amount of evidence for the existence of dark matter (DM) has been accumulating. At the same time, many efforts have been undertaken to try to identify what dark matter is made of. Indirect searches look at places in the Universe where dark matter is known to be abundant and seek for possible annihilation or decay signatures. Indirect searches with the Fermi Gamma ray Space Telescope and Imaging Atmospheric Cherenkov Telescopes (IACTs) are playing a crucial role in constraining the nature of the DM particle through the study of their annihilation into gamma ray…

The Dark Matter Programme of the Cherenkov Telescope Array

In the last decades a vaste amount of evidence for the existence of dark matter has been accumulated. At the same time, many efforts have been undertaken to try to identify what dark matter is. Indirect searches look at places in the Universe where dark matter is believed to be abundant and seek for possible annihilation or decay signatures. The Cherenkov Telescope Array (CTA) represents the next generation of imaging Cherenkov telescopes and, with one site in the Southern hemisphere and one in the Northern hemisphere, will be able to observe all the sky with unprecedented sensitivity and angu…

Search for Semi-Annihilating Dark Matter with Fermi-LAT, H.E.S.S., Planck, and the Cherenkov Telescope Array

Dark matter annihilations have been fiercely restricted by the non-observation of excess events in indirect detection probes. Typically the interactions that dictate annihilation are also present in the dark matter-nucleon scattering cross section, also severely constrained by direct detection experiments. Semi-annihilations arise as a possible way to ameliorate the tension and even change the standard dark matter relic density calculation. In this work, we derive indirect detection bounds for several semi-annihilation channels including gauge bosons, the Higgs, leptophilic and leptophobic sca…

Secluded Dark Matter in light of the Cherenkov Telescope Array (CTA)

Secluded dark matter is one of the most popular dark matter models, where dark matter annihilations go into particles that belong to a dark sector. An interesting way to probe such models is via indirect detection. In particular, gamma-ray observations are rather promising. Taking into account $1\%$ level of systematics, in this work we show that the Cherenkov Telescope Array (CTA) will place the most stringent bounds on the dark matter annihilation cross section, surpassing existing probes based on H.E.S.S., Fermi-LAT, and Planck data, for dark matter masses above $400$ GeV, independently of …

从山脉和空间看山谷中的水平和向上Tau气簇射：发现UHE中微子和新物理学

Horizontal and Upward Tau Airshowers in Valleys from Mountains and Space: Discovering UHE Neutrinos and New Physics

来自地壳或山脉的向上和水平τ空气簇射是PeV和更高能量的超高能UHE中微子nu_{tau}、barν_{tau}和bar{nu}_e的最强信号。τ空气簇射次级粒子的多重性，N_{opt} =10^{12}（E_{tau} /PeV），N_{gamma} = 10^8* E_{tau} /PeV，N_{e^- e^+} = 2*10^7 E_{tau} /PeV，N_{mu} = 3 *10^5（E_{tau} /PeV）^{0.85}，使它们的发现变得容易。UHE nu_tau，barν_tau，根据超级神冈中微子味道混合的证据，nu_mu <-->nu_tau，应该和nu_mu，barν_mu一样丰富。此外，在W的共振能量峰值附近的反中微子电子（横截面ν_e），E_{barν_e} = M^2_W / 2m_e = 6.3*10^{15} eV，也可能产生τ-空气簇射。向上的UHE nu_tau- N相互作用在地壳水平边缘和从下面，其结果向上UHE tau空气簇射向高山，飞机，气球和卫星应该闪烁伽马，mu，X和切伦科夫光向探测器。这种向上的tau空气簇射可能已经击中了附近的卫星GRO伽马探测器，在BATSE阈值的边缘通过短，硬，稀释的伽马爆发闪烁它们。tau空气簇射可以测试UHE中微子相互作用，从而在山谷和向上簇射中对新TeV物理进行额外的微调测试。