Dark matter may exist today in the form of ultraheavy composite bound states. Collisions between such dark matter states can release intense bursts of radiation that includes gamma-rays among the final products. Thus, indirect-detection signals of dark matter may include unconventional gamma-ray bursts. Such bursts may have been missed not necessarily because of their low arriving gamma-ray fluxes, but rather their briefness and rareness. We point out that intense bursts whose non-detection thus far are due to the latter can be detected in the near future with existing and planned facilities. In particular, we propose that, with slight experimental adjustments and suitable data analyses, imaging atmospheric Cherenkov telescopes (IACTs) and Pulsed All-sky Near-infrared and Optical Search for Extra-Terrestrial Intelligence (PANOSETI) are promising tools for detecting such rare, brief, but intense bursts. We also show that if we assume these bursts originate from collisions of dark matter states, IACTs and PANOSETI can probe a large dark matter parameter space beyond existing limits. Additionally, we present a concrete model of dark matter that produces bursts potentially detectable in these instruments.
Dark matter is a key piece of the current cosmological scenario, with weakly interacting massive particles (WIMPs) a leading dark matter candidate. WIMPs have not been detected in their conventional parameter space (100 GeV $\lesssim M_χ \lesssim$ 100 TeV), a mass range accessible with current Imaging Atmospheric Cherenkov Telescopes. As ultraheavy dark matter (UHDM; $M_χ \gtrsim$ 100 TeV) has been suggested as an under-explored alternative to the WIMP paradigm, we search for an indirect dark matter annihilation signal in a higher mass range (up to 30 PeV) with the VERITAS gamma-ray observator…
We study high-resolution hydrodynamic simulations of Milky Way type galaxies obtained within the "Evolution and Assembly of GaLaxies and their Environments" (EAGLE) project, and identify the those that best satisfy observational constraints on the Milky Way total stellar mass, rotation curve, and galaxy shape. Contrary to mock galaxies selected on the basis of their total virial mass, the Milky Way analogues so identified consistently exhibit very similar dark matter profiles inside the solar circle, therefore enabling more accurate predictions for indirect dark matter searches. We find in par…
Indirect Searches for Dark Photon-Photon Tridents in Celestial Objects
Stockholm University（斯德哥尔摩大学）；The Oskar Klein Centre for Cosmoparticle Physics（奥斯卡·克莱因宇宙粒子物理中心）；Institute of Physics, Academia Sinica（中央研究院物理研究所）；Department of Physics and Astronomy, University of California, Irvine（加州大学欧文分校物理与天文学系）
Indirect searches for dark matter (DM) have conventionally been applied to the products of DM annihilation or decay. If DM couples to light force carriers, however, it can be captured into bound states via dissipation of energy that may yield detectable signals. We extend the indirect searches to DM bound state formation and transitions between bound levels, and constrain the emission of unstable dark photons. Our results significantly refine the predicted signal flux that could be observed in experiments. As a concrete example, we use Fermi-LAT dwarf spheroidal observations to obtain constrai…
Dwarf spheroidal galaxies have long been discussed as optimal targets for indirect dark matter searches. However, the majority of such studies have been conducted with gamma-ray instruments. In this review, we discuss the very recent progress that has been made in radio-based indirect dark matter searches. We look at existing work on this topic and discuss the future prospects that motivate continued work in this newly developing field that promises to become, in the light of the up-coming Square Kilometre Array, a prominent component of the hunt for dark matter.
Indirect searches for dark matter are based on detecting an anomalous flux of photons, neutrinos or cosmic-rays produced in annihilations or decays of dark matter candidates gravitationally accumulated in heavy cosmological objects, like galaxies, the Sun or the Earth. Additionally, evidence for dark matter that can also be understood as indirect can be obtained from early universe probes, like fluctuations of the Cosmic Microwave Background temperature, the primordial abundance of light elements or the Hydrogen 21-cm line. The techniques needed to detect these different signatures require ver…
Discovery prospects of dwarf spheroidal galaxies for indirect dark matter searches
我们研究了大型巡天望远镜（LSST）在银河系中发现新矮球状星系的前景。采用Milky-Way晕子结构模型和连接暗晕和卫星星系的唯象公式，我们得到了$V$波段的表面亮度分布，预测LSST将发现几十到几百个高于其灵敏度的矮球状星系。即将被发现的矮星将是间接寻找暗物质湮灭产率的有趣目标。我们预测了这些天体中暗物质湮灭产生的γ射线辐射的分布函数，并讨论了这些信号在费米大天区望远镜（LAT）和切伦科夫望远镜阵列（CTA）上的可探测性。通过结合预测的矮星系的信息，我们得到了预期的灵敏度$10^{-26}$ cm $^3$ s $^{-1}$（对于质量为10 GeV的暗物质粒子与费米LAT）和$5\times 10^{-24}$ cm $^3$ s $^{-1}$（对于质量为500 GeV的暗物质粒子与CTA）的湮灭截面$\langle σv \rangle$。我们发现，目前的不确定性的银河晕的质量测量是相对较小的泊松误差相比，绘制最有前途的矮星从底层的通量分布。
These lectures, presented at the 2021 Les Houches Summer School on Dark Matter, provide an introduction to key methods and tools of indirect dark matter searches, as well as a status report on the field circa summer 2021. Topics covered include the possible effects of energy injection from dark matter on the early universe, methods to calculate both the expected energy distribution and spatial distribution of particles produced by dark matter interactions, an outline of theoretical models that predict diverse signals in indirect detection, and a discussion of current constraints and some claim…
I present a short overview of the latest developments in indirect searches for dark matter using gamma rays, X-rays, charged cosmic rays, micro waves, radio waves, and neutrinos. I briefly outline key past, present, and future experiments and their search strategies. In several searches there are exciting anomalies which could potentially be emerging dark matter signals. I discuss these anomalous signals, and some future prospects to determine their origins.
Low-energy antinuclei measurements for background-free indirect dark matter searches and PBH signatures
Northeastern University（东北大学）；University of Hawaii at Manoa（夏威夷大学马诺阿分校）；University of Torino/INFN（都灵大学/意大利国家核物理研究所）；University of Maryland, Baltimore County（马里兰大学巴尔的摩县分校）；University of Wisconsin–Madison（威斯康星大学麦迪逊分校）；Stockholm University（斯德哥尔摩大学）；Oakland University（奥克兰大学）；University of Chicago（芝加哥大学）；University of California, Santa Cruz（加利福尼亚大学圣克鲁兹分校）；Pennsylvania State University（宾夕法尼亚州立大学）
