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  • Astrophysics  (1,393)
  • 2020-2024  (6)
  • 2000-2004  (1,387)
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  • 1
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    EDP SCIENCES
    Publication Date: 2024-04-05
    Description: Astrophysics
    Keywords: Astrophysics ; thema EDItEUR::P Mathematics and Science::PH Physics::PHV Applied physics::PHVB Astrophysics
    Language: French
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  • 2
    Publication Date: 2024-04-05
    Description: Ideas and Methods of Supersymmetry and Supergravity: Or a Walk Through Superspace provides a comprehensive, detailed, and self-contained account of four dimensional simple supersymmetry and supergravity. Throughout the book, the authors cultivate their material in detail with calculations and full discussions of the fundamental ideas and motivations. They develop the subject in its superfield formulations but where appropriate for illustration, analogy, and comparison with conventional field theory, they use the component formulation. The book discusses many subjects that, until now, can only be found in the research literature. In addition, it presents a plethora of new results. Combining classical and quantum field theory with group theory, differential geometry, and algebra, the book begins with a solid mathematical background that is used in the rest of the book. The next chapter covers algebraic aspects of supersymmetry and the concepts of superspace and superfield. In the following chapters, the book presents classical and quantum superfield theory and the superfield formulation of supergravity. A synthesis of results and methods developed in the book, the final chapter concludes with the theory of effective action in curved superspaces. After studying this book, readers should be well prepared to pursue independent research in any area of supersymmetry and supergravity. It will be an indispensable source of reference for advanced graduate students, postdoctoral faculty, and researchers involved in quantum field theory, high energy physics, gravity theory, mathematical physics, and applied mathematics.
    Keywords: Astrophysics ; Nuclear physics ; thema EDItEUR::P Mathematics and Science::PH Physics::PHV Applied physics::PHVB Astrophysics ; thema EDItEUR::P Mathematics and Science::PH Physics::PHN Nuclear physics
    Language: English
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  • 3
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    IntechOpen | IntechOpen
    Publication Date: 2024-04-04
    Description: Gravitational waves were predicted by Albert Einstein in his most famous theory, the general theory of relativity, but it took almost a century for these waves to be detected and their existence proven. This book introduces gravitational waves and discusses some of their applications in five dimensions, this is all done in classical gravity. It also explains gravitational waves in quantum gravity (in which the universe is considered to be not continuous) and implications for trying to understand and explore dark energy and an expanding accelerated universe.
    Keywords: Linearized Theory ; Gravitational Waves Energy ; Field Approach ; Generation of Gravitational Waves ; Interferometers ; Resonant Mass Detectors ; Data Analyses Techniques ; New Detectors ; Searches ; Parameter Estimation ; Astrophysics ; Multi-Messenger Astronomy ; thema EDItEUR::P Mathematics and Science::PG Astronomy, space and time
    Language: English
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  • 4
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    Springer Nature | Springer International Publishing
    Publication Date: 2024-04-04
    Description: This is an open access book. This book, the first edited collection of its kind, explores the recent emergence of philosophical research in astrophysics. It assembles a variety of original essays from scholars who are currently shaping this field, and it combines insightful overviews of the current state of play with novel, significant contributions. It therefore provides an ideal source for understanding the current debates in philosophy of astrophysics, and it offers new ideas for future cutting-edge research. The selection of essays offered in this book addresses methodological and metaphysical questions that target a wide range of topics, including dark matter, black holes, astrophysical observations and modelling. The book serves as the first standard resource in philosophy of astrophysics for all scholars who work in the field and want to expand or deepen their knowledge, but it also provides an accessible guide for all those philosophers and scientists who are interested in getting a first, basic understanding of the main issues in philosophy of astrophysics.
    Keywords: Philosophy of astrophysics ; Philosophy of science ; Astrophysics ; Metaphysics and epistemology ; Simulation of the universe ; constellations and philosophy ; thema EDItEUR::P Mathematics and Science::PD Science: general issues::PDA Philosophy of science ; thema EDItEUR::P Mathematics and Science::PG Astronomy, space and time ; thema EDItEUR::P Mathematics and Science::PS Biology, life sciences::PSA Life sciences: general issues ; thema EDItEUR::Q Philosophy and Religion::QD Philosophy::QDT Topics in philosophy::QDTK Philosophy: epistemology and theory of knowledge
    Language: English
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  • 5
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    World Scientific Publishing Co.
    Publication Date: 2022-01-31
    Description: This book summarizes the science to be carried out by the upcoming Cherenkov Telescope Array, a major ground-based gamma-ray observatory that will be constructed over the next six to eight years. The major scientific themes, as well as core program of key science projects, have been developed by the CTA Consortium, a collaboration of scientists from many institutions worldwide. CTA will be the major facility in high-energy and very high-energy photon astronomy over the next decade and beyond. CTA will have capabilities well beyond past and present observatories. Thus, CTA's science program is expected to be rich and broad and will complement other major multiwavelength and multimessenger facilities. This book is intended to be the primary resource for the science case for CTA and it thus will be of great interest to the broader physics and astronomy communities. The electronic version (e-book) is available in open access.
    Keywords: Gamma Rays ; Astrophysics ; Cherenkov Telescope Array (CTA) ; Cherenkov Telescopes ; Astroparticle Physics ; Multiwavelength ; Multimessenger ; Astronomy ; Dark Matter
    Language: English
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  • 6
    Publication Date: 2022-01-31
    Description: The four volumes of the proceedings of MG14 give a broad view of all aspects of gravitational physics and astrophysics, from mathematical issues to recent observations and experiments. The scientific program of the meeting included 35 morning plenary talks over 6 days, 6 evening popular talks and 100 parallel sessions on 84 topics over 4 afternoons. Volume A contains plenary and review talks ranging from the mathematical foundations of classical and quantum gravitational theories including recent developments in string theory, to precision tests of general relativity including progress towards the detection of gravitational waves, and from supernova cosmology to relativistic astrophysics, including topics such as gamma ray bursts, black hole physics both in our galaxy and in active galactic nuclei in other galaxies, and neutron star, pulsar and white dwarf astrophysics. The remaining volumes include parallel sessions which touch on dark matter, neutrinos, X-ray sources, astrophysical black holes, neutron stars, white dwarfs, binary systems, radiative transfer, accretion disks, quasars, gamma ray bursts, supernovas, alternative gravitational theories, perturbations of collapsed objects, analog models, black hole thermodynamics, numerical relativity, gravitational lensing, large scale structure, observational cosmology, early universe models and cosmic microwave background anisotropies, inhomogeneous cosmology, inflation, global structure, singularities, chaos, Einstein-Maxwell systems, wormholes, exact solutions of Einstein's equations, gravitational waves, gravitational wave detectors and data analysis, precision gravitational measurements, quantum gravity and loop quantum gravity, quantum cosmology, strings and branes, self-gravitating systems, gamma ray astronomy, cosmic rays and the history of general relativity.
    Keywords: Binary Systems ; Astrophysics ; Loop Quantum Gravity ; Gravitational Wave Detectors and Data Analysis ; Black Hole Thermodynamics ; Active Galactic Nuclei ; Observational Cosmology ; Gravitational Wave ; X-ray Sources ; Dark Matter ; General Relativity ; Cosmic Rays ; Inflation ; Numerical Relativity ; Neutrinos ; Theoretical Physics ; Large Scale Structure ; Inhomogeneous Cosmology ; Radiative Transfer ; Supernova ; Gravitation ; Black Hole ; White Dwarf ; Precision Gravitational Measurements ; Quantum Gravity ; Quantum Cosmology ; Einstein-Maxwell Systems ; String Theory ; Cosmic Microwave Background Anisotropies ; Accretion Disks ; Neutron Star ; Gravitational Lensing ; Exact Solutions of Einstein's Equations ; Early Universe Models ; Wormholes ; Cosmology ; Pulsar ; Gamma Ray Burst
    Language: English
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  • 7
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    In:  Other Sources
    Publication Date: 2019-08-28
    Description: A NASA spacecraft set for launch Nov. 17 is designed to help scientists determine the origin of gamma-ray bursts by pinpointing their sources in the sky and quickly focusing optical/ultraviolet and X-ray telescopes on them.
    Keywords: Astrophysics
    Type: Aviation Week and Space Technology; 161; 18; 33
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  • 8
    Publication Date: 2019-08-28
    Description: The measurements by neutron detectors on Odyssey have revealed two large poleward regions with large depression of flux of epithermal and high energy neutrons. The flux of neutrons from Mars is known to be produced by the bombardment of the surface layer by galactic cosmic rays. The leakage flux of epithermal and fast neutrons has regional variation by a factor of 10 over the surface of Mars. These variations are mainly produced by variations of hydrogen content in the shallow subsurface. On Mars hydrogen is associated with water. Therefore, the Northern and Southern depressions of neutron emission could be identified as permafrost regions with very high content of water ice. These regions are much larger than the residual polar caps, and could contain the major fraction of subsurface water ice. Here we present the results of HEND neutron data deconvolution for these regions and describe the similarities and differences between them.
    Keywords: Astrophysics
    Type: Lunar and Planetary Science XXXV: Special Session: Mars Climate Change; LPI-Contrib-1197
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  • 9
    Publication Date: 2019-08-28
    Description: It is the Policy of NASA s Office of Space Science to emphasize and encourage the addition of Participating Scientist Programs (PSP s) to broaden the scientific impact of missions. A Participating Scientist Program for the STARDUST Mission: STARDUST is the fourth Discovery mission, and it is the first sample return mission selected within the Discovery Program. The STARDUST Spacecraft will fly through the coma of comet PIwildt-2 in early January 2004, and return the samples to the Earth in January 2006. The Principal Investigator of the STARDUST mission, Dr. Donald Brownlee, has generously requested the implementation of a PSP for STARDUST in order to provide more community participation in the initial characterization and analysis of the samples from PIwildt-2. In particular participating scientists will fill out the membership of the Preliminary Examination Team (PET) called for in the original 1994 STARDUST proposal accepted by NASA in 1995. The work of the PET will be organized around major subdiscipline areas such as mineralogy and petrology, isotopic abundances, and elemental composition. There will be leaders for each of these areas, and also a number of team members within each. Support will be commensurate with the level of participation.
    Keywords: Astrophysics
    Type: Workshop on Cometary Dust in Astrophysics; 51; LPI-Contrib-1182
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  • 10
    Publication Date: 2019-08-28
    Description: The Astronomy and Physics Division at NASA Headquarters has an active and vibrant program in Laboratory Astrophysics. The objective of the program is to provide the spectroscopic data required by observers to analyze data from NASA space astronomy missions. The program also supports theoretical investigations to provide those spectroscopic parameters that cannot be obtained in the laboratory; simulate space environment to understand formation of certain molecules, dust grains and ices; and production of critically compiled databases of spectroscopic parameters. NASA annually solicits proposals, and utilizes the peer review process to select meritorious investigations for funding. As the mission of NASA evolves, new missions are launched, and old ones are terminated, the Laboratory Astrophysics program needs to evolve accordingly. Consequently, it is advantageous for NASA and the astronomical community to periodically conduct a dialog to assess the status of the program. This Workshop provides a forum for producers and users of laboratory data to get together and understand each others needs and limitations. A multi-wavelength approach enables a cross fertilization of ideas across wavelength bands.
    Keywords: Astrophysics
    Type: Proceedings of the NASA Laboratory Astrophysics Workshop; 15-16; NASA/CP-2002-211863
    Format: application/pdf
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