Dark Matter Searches with Gamma Rays from the Galactic Center Halo and Cosmic-Ray Antimatter - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Dark Matter Searches with Gamma Rays from the Galactic Center Halo and Cosmic-Ray Antimatter write by James Lee Ryan. This book was released on 2022. Dark Matter Searches with Gamma Rays from the Galactic Center Halo and Cosmic-Ray Antimatter available in PDF, EPUB and Kindle. It is unknown what constitutes dark matter.The properties of dark matter particles may be observed indirectly if dark matter annihilates or decays into Standard Model particles that are then detected. Work is presented on two such experiments, performed with GAPS and VERITAS. GAPS is a forthcoming balloon-borne cosmic-ray antimatter detector whose unprecedented sensitivity to the fluxes of antiprotons, antideuterons, and antihelium makes possible the detection of a variety of exotic sources of these particles. We outline development of the GAPS TOF system, and demonstrate its ability to achieve desired resolutions in time, position, and energy. VERITAS is an imaging atmospheric Cherenkov telescope array that has been observing gamma rays from the Galactic Center region for over 10 years. We develop a template-based background estimation method to look for excess gamma rays in the Galactic Center halo. No significant excess is found, and limits on the thermally-averaged annihilation cross section are derived with dependence on the annihilation channel, reaching $\langle \sigma_\text{ann} v\rangle
Searching for Dark Matter with Cosmic Gamma Rays
Searching for Dark Matter with Cosmic Gamma Rays - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Searching for Dark Matter with Cosmic Gamma Rays write by Andrea Albert. This book was released on 2016-09-06. Searching for Dark Matter with Cosmic Gamma Rays available in PDF, EPUB and Kindle. Searching for Dark Matter with Cosmic Gamma Rays summarizes the evidence for dark matter and what we can learn about its particle nature using cosmic gamma rays. It has almost been 100 years since Fritz Zwicky first detected hints that most of the matter in the Universe that doesn't directly emit or reflect light. Since then, the observational evidence for dark matter has continued to grow. Dark matter may be a new kind of particle that is governed by physics beyond our Standard Model of particle physics. In many models, dark matter annihilation or decay produces gamma rays. There are a variety of instruments observing the gamma-ray sky from tens of MeV to hundreds of TeV. Some make deep, focused observations of small regions, while others provide coverage of the entire sky. Each experiment offers complementary sensitivity to dark matter searches in a variety of target sizes, locations, and dark matter mass scales. We review results from recent gamma-ray experiments including anomalies some have attributed to dark matter. We also discuss how our gamma-ray observations complement other dark matter searches and the prospects for future experiments.
Optimized Dark Matter Searches in Deep Observations of Segue 1 with MAGIC
Optimized Dark Matter Searches in Deep Observations of Segue 1 with MAGIC - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Optimized Dark Matter Searches in Deep Observations of Segue 1 with MAGIC write by Jelena Aleksić. This book was released on 2015-11-06. Optimized Dark Matter Searches in Deep Observations of Segue 1 with MAGIC available in PDF, EPUB and Kindle. This thesis presents the results of indirect dark matter searches in the gamma-ray sky of the near Universe, as seen by the MAGIC Telescopes. The author has proposed and led the 160 hours long observations of the dwarf spheroidal galaxy Segue 1, which is the deepest survey of any such object by any Cherenkov telescope so far. Furthermore, she developed and completely characterized a new method, dubbed “Full Likelihood”, that optimizes the sensitivity of Cherenkov instruments for detection of gamma-ray signals of dark matter origin. Compared to the standard analysis techniques, this novel approach introduces a sensitivity improvement of a factor of two (i.e. it requires 4 times less observation time to achieve the same result). In addition, it allows a straightforward merger of results from different targets and/or detectors. By selecting the optimal observational target and combining its very deep exposure with the Full Likelihood analysis of the acquired data, the author has improved the existing MAGIC bounds to the dark matter properties by more than one order of magnitude. Furthermore, for particles more massive than a few hundred GeV, those are the strongest constraints from dwarf galaxies achieved by any gamma-ray instrument, both ground-based or space-borne alike.
The Role of Halo Substructure in Gamma-Ray Dark Matter Searches
The Role of Halo Substructure in Gamma-Ray Dark Matter Searches - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook The Role of Halo Substructure in Gamma-Ray Dark Matter Searches write by Miguel A. Sánchez-Conde. This book was released on 2020-05-28. The Role of Halo Substructure in Gamma-Ray Dark Matter Searches available in PDF, EPUB and Kindle. An important, open research topic today is to understand the relevance that dark matter halo substructure may have for dark matter searches. In the standard cosmological model, halo substructure or subhalos are predicted to be largely abundant inside larger halos, for example, galaxies such as ours, and are thought to form first and later merge to form larger structures. Dwarf satellite galaxies—the most massive exponents of halo substructure in our own galaxy—are already known to be excellent targets for dark matter searches, and indeed, they are constantly scrutinized by current gamma-ray experiments in the search for dark matter signals. Lighter subhalos not massive enough to have a visible counterpart of stars and gas may be good targets as well, given their typical abundances and distances. In addition, the clumpy distribution of subhalos residing in larger halos may boost the dark matter signals considerably. In an era in which gamma-ray experiments possess, for the first time, the exciting potential to put to test the preferred dark matter particle theories, a profound knowledge of dark matter astrophysical targets and scenarios is mandatory should we aim for accurate predictions of dark matter-induced fluxes for investing significant telescope observing time on selected targets and for deriving robust conclusions from our dark matter search efforts. In this regard, a precise characterization of the statistical and structural properties of subhalos becomes critical. In this Special Issue, we aim to summarize where we stand today on our knowledge of the different aspects of the dark matter halo substructure; to identify what are the remaining big questions, and how we could address these; and, by doing so, to find new avenues for research.
Matter, Anti-matter And Dark Matter, Proceedings Of The Second International Workshop
Matter, Anti-matter And Dark Matter, Proceedings Of The Second International Workshop - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Matter, Anti-matter And Dark Matter, Proceedings Of The Second International Workshop write by Roberto Battiston. This book was released on 2002-08-30. Matter, Anti-matter And Dark Matter, Proceedings Of The Second International Workshop available in PDF, EPUB and Kindle. This book presents the progress in cosmic ray physics following the recent results obtained by balloon, satellite and underground experiments. The following topics are reviewed: Composition and propagation of cosmic rays, trapping of charged particles in the earth's magnetic field, atmospheric neutrinos, and high energy photon measurements in space.
