A Search For Spectral Lines From Wimp Annihilation In The Milky Way Using The Fermi Large Area Telescope
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A Search For Spectral Lines From Wimp Annihilation In The Milky Way Using The Fermi Large Area Telescope
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Author : Yvonne Vasetta Edmonds
language : en
Publisher: Stanford University
Release Date : 2011
A Search For Spectral Lines From Wimp Annihilation In The Milky Way Using The Fermi Large Area Telescope written by Yvonne Vasetta Edmonds and has been published by Stanford University this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with categories.
The most popular class of dark matter candidates is the class of weakly-interacting massive particles (WIMPs). The Fermi Large Area Telescope has the possibility of indirectly detecting WIMPs by the flux from their annihilation/decay products. When a WIMP annihilates or decays directly into a photon gamma and another particle Y the photons are monochromatic. Detection of the resulting spectral line(s) would provide convincing evidence for particulate dark matter and could provide the WIMP mass. In the case of no detection, knowledge of the dark matter distribution can be used to place limits on the annihilation cross section and lifetime for the WIMP(s) to Y-gamma channel. We present the spectrum from 4.8 to 264 GeV and spectral line flux upper limits, obtained from a subset of this spectrum, from 7 to 200 GeV. The spatial region of the dataset covers a large portion of the sky, the high latitudes plus the Galactic Center. We report upper limits on the WIMP cross sections for annihilation to gamma-gamma and Z-gamma and lower limits on the WIMP lifetime for decay to gamma-neutrino. We discuss the implications of the spectrum and line flux limits for several dark matter models with optimistic branching ratios for photon channels.
A Search For Spectral Lines From Wimp Annihilation In The Milky Way Using The Fermi Large Area Telescope
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Author : Yvonne Vasetta Edmonds
language : en
Publisher:
Release Date : 2011
A Search For Spectral Lines From Wimp Annihilation In The Milky Way Using The Fermi Large Area Telescope written by Yvonne Vasetta Edmonds and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with categories.
The most popular class of dark matter candidates is the class of weakly-interacting massive particles (WIMPs). The Fermi Large Area Telescope has the possibility of indirectly detecting WIMPs by the flux from their annihilation/decay products. When a WIMP annihilates or decays directly into a photon gamma and another particle Y the photons are monochromatic. Detection of the resulting spectral line(s) would provide convincing evidence for particulate dark matter and could provide the WIMP mass. In the case of no detection, knowledge of the dark matter distribution can be used to place limits on the annihilation cross section and lifetime for the WIMP(s) to Y-gamma channel. We present the spectrum from 4.8 to 264 GeV and spectral line flux upper limits, obtained from a subset of this spectrum, from 7 to 200 GeV. The spatial region of the dataset covers a large portion of the sky, the high latitudes plus the Galactic Center. We report upper limits on the WIMP cross sections for annihilation to gamma-gamma and Z-gamma and lower limits on the WIMP lifetime for decay to gamma-neutrino. We discuss the implications of the spectrum and line flux limits for several dark matter models with optimistic branching ratios for photon channels.
Optimized Dark Matter Searches In Deep Observations Of Segue 1 With Magic
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Author : Jelena Aleksić
language : en
Publisher: Springer
Release Date : 2015-11-06
Optimized Dark Matter Searches In Deep Observations Of Segue 1 With Magic written by Jelena Aleksić and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015-11-06 with Science categories.
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.
Aspects Of Wimp Dark Matter Searches At Colliders And Other Probes
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Author : Enrico Morgante
language : en
Publisher: Springer
Release Date : 2017-10-05
Aspects Of Wimp Dark Matter Searches At Colliders And Other Probes written by Enrico Morgante and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017-10-05 with Science categories.
This thesis covers several theoretical aspects of WIMP (weakly interacting massive particles) dark matter searches, with a particular emphasis on colliders. It mainly focuses on the use of effective field theories as a tool for Large Hadron Collider (LHC) searches, discussing in detail the issue of their validity, and on simplified dark matter models, which are receiving a growing attention from the physics community. It highlights the theoretical consistency of simplified models, which is essential in order to correctly exploit their potential and for them to be a common reference when comparing results from different experiments. This thesis is of interest to researchers (both theorists and experimentalists) in the field of dark matter searches, and offers a comprehensive introduction to dark matter and to WIMP searches for students and non-experts.
The Search For Wimp Dark Matter Continuum Gamma Ray Emission From Dark Matter Satellites In The Milky Way Using The Fermi Lat
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Author : Wang Ping
language : en
Publisher: Stanford University
Release Date : 2011
The Search For Wimp Dark Matter Continuum Gamma Ray Emission From Dark Matter Satellites In The Milky Way Using The Fermi Lat written by Wang Ping and has been published by Stanford University this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with categories.
This thesis focuses on the search for unknown dark matter (DM) satellites in the Milky Way using the Fermi Large Area Space Telescope (LAT). The Fermi Gamma-ray Space Telescope (Fermi) is a next generation space observatory, which was successfully launched on June 11th, 2008. The LAT is the principal scientific instrument onboard. Its unprecedented angular resolution and sensitivity in the 100 MeV to > 300 GeV energy range makes it an excellent instrument for probing the sky for DM satellites. Current N-body simulations based on the Lambda-CDM cosmology model predict a large number of as yet unobserved DM satellites in our galaxy; some satellites are predicted to be extended sources (> 1deg extension) as seen by the LAT. Our work assumes that a significant component of DM is a Weakly Interacting Massive Particle (WIMP) in the 100 GeV mass range. The annihilation of WIMPs results in many high energy gamma rays that can be well measured by the LAT. The WIMP produced gamma-ray spectrum from the putative DM satellites is considerably harder than most astrophysical sources. Also, DM satellites have no astronomical counterparts in the X-ray and radio bands, and the emission has no time variability. My thesis will focus on a blind analysis in the search for unknown DM satellites using one year of LAT data, and setting constraints on some WIMP models based on the results of our analysis in which we find no candidates.
The Role Of Halo Substructure In Gamma Ray Dark Matter Searches
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Author : Miguel A. Sánchez-Conde
language : en
Publisher: MDPI
Release Date : 2020-05-28
The Role Of Halo Substructure In Gamma Ray Dark Matter Searches written by Miguel A. Sánchez-Conde and has been published by MDPI this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020-05-28 with Mathematics categories.
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.
Advances In Modern And Applied Sciences
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Author : Sujay Pal
language : en
Publisher: Scientific Research Publishing, Inc. USA
Release Date : 2022-11-10
Advances In Modern And Applied Sciences written by Sujay Pal and has been published by Scientific Research Publishing, Inc. USA this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022-11-10 with Antiques & Collectibles categories.
This book Advances in Modern and Applied Science materializes our long-cherished dream of publishing a series of volumes consisting of review papers on contemporary research fields from a broad spectrum of basic sciences. The present volume, which is our first baby-step towards that fulfilment, includes a collection of twenty-five review articles contributed by about fifty researchers and scientists whose vocations are in diverse fields of science including astrophysics, astronomy, high energy physics, space science, atmospheric sciences, computer sciences to material sciences.
Searching For Dark Matter With The Atlas Detector
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Author : Steven Schramm
language : en
Publisher: Springer
Release Date : 2016-11-23
Searching For Dark Matter With The Atlas Detector written by Steven Schramm and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016-11-23 with Science categories.
This thesis describes the search for Dark Matter at the LHC in the mono-jet plus missing transverse momentum final state, using the full dataset recorded in 2012 by the ATLAS Experiment. It is the first time that the number of jets is not explicitly restricted to one or two, thus increasing the sensitivity to new signals. Instead, a balance between the most energetic jet and the missing transverse momentum is required, thus selecting mono-jet-like final states. Collider searches for Dark Matter have typically used signal models employing effective field theories (EFTs), even when comparing to results from direct and indirect detection experiments, where the difference in energy scale renders many such comparisons invalid. The thesis features the first robust and comprehensive treatment of the validity of EFTs in collider searches, and provides a means by which the different classifications of Dark Matter experiments can be compared on a sound and fair basis.
Ask The Experts Astronomy
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Author : Scientific American Editors
language : en
Publisher: Scientific American
Release Date : 2014-08-25
Ask The Experts Astronomy written by Scientific American Editors and has been published by Scientific American this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014-08-25 with Science categories.
For going on two decades, Scientific American's "Ask the Experts" column has been answering reader questions on all fields of science. We've taken your questions from the basic to the esoteric and reached out to top scientists, professors and researchers to find out why the sky is blue or whether we really only use 10% of our brains. Now, we've combed through our archives and have compiled some of the most interesting questions (and answers) into a series of eBooks. Organized by subject, each eBook provides short, easily digestible answers to questions on that particular branch of the sciences. The second eBook in our series – Astronomy – looks skyward and explains a variety of universal phenomena and theories. Are you curious about how planets acquire rings or what creates those gorgeous spiral arms around galaxies? Or maybe you want to know why the Big Bang didn't collapse into a black hole. Astrophysicists, professors and scientists tackle questions about stars, planets, asteroids, galaxies and nebulae, the expanding universe as well as the oddities – black holes, wormholes and dark matter. Look inside and find out what we know and what we don't know about these wonders.
Cosmology And The Early Universe
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Author : Pasquale Di Bari
language : en
Publisher: CRC Press
Release Date : 2018-09-03
Cosmology And The Early Universe written by Pasquale Di Bari and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-09-03 with Science categories.
This book discusses cosmology from both an observational and a strong theoretical perspective. The first part focuses on gravitation, notably the expansion of the universe and determination of cosmological parameters, before moving onto the main emphasis of the book, the physics of the early universe, and the connections between cosmological models and particle physics. The book provides links with particle physics and with investigations of the theories beyond the Standard Model, especially in connection to dark matter and matter-antimatter asymmetry puzzles. Readers will gain a comprehensive account of cosmology and the latest observational results, without requiring prior knowledge of relativistic theories, making the text ideal for students. Features: Provides a self-contained discussion of modern cosmology results without requiring any prior knowledge of relativistic theories, enabling students to learn the first rudiments needed for a rigorous comprehension of cosmological concepts Contains a timely discussion of the latest cosmological results, including those from WMAP and the Planck satellite, and discuss the cosmological applications of the Nobel Prize 2017 awarded discovery of gravitational waves by the LIGO interferometer and the very high energy neutrinos discovered by the IceCube detector Includes original figures complementing mathematical derivations and accounting for the most important cosmological observations, in addition to a wide variety of problems with a full set of solutions discussed in detail in an accompanying solutions manual (available upon qualifying course adoption) To view the errata please visit the authors personal webpage.