The Search For Wimp Dark Matter Continuum Gamma Ray Emission From Dark Matter Satellites In The Milky Way Using The Fermi Lat
DOWNLOAD eBooks
Download The Search For Wimp Dark Matter Continuum Gamma Ray Emission From Dark Matter Satellites In The Milky Way Using The Fermi Lat PDF/ePub or read online books in Mobi eBooks. Click Download or Read Online button to get The Search For Wimp Dark Matter Continuum Gamma Ray Emission From Dark Matter Satellites In The Milky Way Using The Fermi Lat book now. This website allows unlimited access to, at the time of writing, more than 1.5 million titles, including hundreds of thousands of titles in various foreign languages. If the content not found or just blank you must refresh this page
The Search For Wimp Dark Matter Continuum Gamma Ray Emission From Dark Matter Satellites In The Milky Way Using The Fermi Lat
DOWNLOAD eBooks
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
DOWNLOAD eBooks
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.
From The Fermi Scale To Cosmology
DOWNLOAD eBooks
Author : Alberto Salvio
language : en
Publisher: Frontiers Media SA
Release Date : 2019-12-06
From The Fermi Scale To Cosmology written by Alberto Salvio and has been published by Frontiers Media SA this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019-12-06 with categories.
A Search For Spectral Lines From Wimp Annihilation In The Milky Way Using The Fermi Large Area Telescope
DOWNLOAD eBooks
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
DOWNLOAD eBooks
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.
Astroparticle Physics And Cosmology
DOWNLOAD eBooks
Author : Subhendra Mohanty
language : en
Publisher: Springer Nature
Release Date : 2020-10-09
Astroparticle Physics And Cosmology written by Subhendra Mohanty and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020-10-09 with Science categories.
Cosmology and astroparticle physics have seen an avalanche of discoveries in the past decade (IceCube - high energy neutrinos, LIGO - gravitational waves, Fermi- gamma-ray telescope, Xenon-1T - dark matter detection, PLANCK- cosmic microwave radiation, EHT picture of black hole, SDSS -galaxy surveys), all of which require a multidisciplinary background for analyzing the phenomena. The arena for testing particle physics models is in the multimessenger astronomical observations and at the same time cosmology now requires a particle physics basis for explaining many phenomena. This book discusses the theoretical tools of particle physics and general relativity which are essential for understanding and correlating diverse astronomical observations.
A Simulation Of Cosmic Rays Interacting With Dark Matter Surrounding The Milky Way
DOWNLOAD eBooks
Author : Gregory Leonard LaScola
language : en
Publisher:
Release Date : 1999
A Simulation Of Cosmic Rays Interacting With Dark Matter Surrounding The Milky Way written by Gregory Leonard LaScola and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1999 with Baryons categories.
Matter Antimatter And Dark Matter
DOWNLOAD eBooks
Author : Roberto Battiston
language : en
Publisher: World Scientific
Release Date : 2002
Matter Antimatter And Dark Matter written by Roberto Battiston and has been published by World Scientific this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002 with Science categories.
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.
Reports
DOWNLOAD eBooks
Author : Michael Kuhlen
language : en
Publisher:
Release Date : 2009
Reports written by Michael Kuhlen and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with Dark matter (Astronomy) categories.
The unambiguous detection of dark matter annihilation in our Galaxy would unravel one of the most outstanding puzzles in particle physics and cosmology. Recent observations have motivated models in which the annihilation rate is boosted by the Sommerfeld effect, a nonperturbative enhancement arising from a long-range attractive force. We applied the Sommerfeld correction to Via Lactea II, a high-resolution N-body simulation of a Milky Way-sized galaxy, to investigate the phase-space structure of the galactic halo. We found that the annihilation luminosity from kinematically cold substructure could be enhanced by orders of magnitude relative to previous calculations, leading to the prediction of gamma-ray fluxes from as many as several hundred dark clumps that should be detectable by the Fermi satellite.
Proceedings Of The Fourth International Workshop On The Identification Of Dark Matter
DOWNLOAD eBooks
Author : Neil John Curwen Spooner
language : en
Publisher: World Scientific
Release Date : 2003
Proceedings Of The Fourth International Workshop On The Identification Of Dark Matter written by Neil John Curwen Spooner and has been published by World Scientific this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with Technology & Engineering categories.
The objective of this workshop series is to assess the status of work attempting to identify what constitutes dark matter - in particular, to consider the techniques being used, how successful they are, and what new techniques are likely to improve prospects for identifying likely dark matter candidates in the future.