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  • Astrophysics  (2,600)
  • 2020-2024  (6)
  • 2015-2019  (1,207)
  • 2000-2004  (1,387)
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Year
  • 1
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    Gravitation relativiste (2024)
    EDP SCIENCES
    Details
    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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    E-BOOK
  • 2
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    Ideas and Methods of Supersymmetry and Supergravity or A Walk Through Superspace (2021)
    Taylor & Francis | CRC Press
    Details
    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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    E-BOOK
  • 3
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    Gravitational Waves (2024)
    IntechOpen | IntechOpen
    Details
    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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    E-BOOK
  • 4
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    Philosophy of Astrophysics (2023)
    Springer Nature | Springer International Publishing
    Details
    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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    Science with the Cherenkov Telescope Array (2021)
    World Scientific Publishing Co.
    Details
    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
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    The Fourteenth Marcel Grossmann Meeting:On Recent Developments in Theoretical and Experimental General Relativity, Astrophysics, and Relativistic Field Theories (In 4 Volumes) (2021)
    World Scientific Publishing Co.
    Details
    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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    E-BOOK
  • 7
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    Pressure Balance and Intrabinary Shock Stability in Rotation-Powered State Redback and Transitional Millisecond Pulsar Binary Systems (2018)
    In:  CASI
    Details
    Publication Date: 2020-01-22
    Description: A number of low-mass millisecond pulsar (MSP) binaries in their rotation-powered state exhibit double-peaked X-ray orbital modulation centered at inferior pulsar conjunction. This state, which has been known to persist for years, has recently been interpreted as emission from a shock that enshrouds the pulsar. However, the pressure balance for such a configuration is a crucial unresolved issue. We consider two scenarios for pressure balance: a companion magnetosphere and stellar mass loss with gas dominance. It is found that the magnetospheric scenario requires several kilogauss poloidal fields for isobaric surfaces to enshroud the MSP, as well as for the magnetosphere to remain stable if there is significant mass loss. For the gas-dominated scenario, it is necessary that the companion wind loses angular momentum prolifically as an advection- or heating-dominated flow. Thermal bremsstrahlung cooling in the flow may be observable as a UV to soft X-ray component independent of orbital phase if the mass rate is high. We formulate the general requirements for shock stability against gravitational influences in the pulsar rotation-powered state for the gas-dominated scenario. We explore stabilizing mechanisms, principally irradiation feedback, which anticipates correlated shock emission and companion variability and predicts F(sub )/F(sub X) is approximately less than 14 for the ratio of pulsar magnetospheric -ray to total shock soft-to-hard X-ray fluxes. This stability criterion implies an unbroken extension of X-ray power-law emission to hundreds of keV for some systems. We explore observational discriminants between the gas-dominated and magnetospheric scenarios, motivating contemporaneous radio through -ray monitoring of these systems.
    Keywords: Astrophysics
    Type: GSFC-E-DAA-TN67095 , Astrophysical Journal (ISSN 0004-637X) (e-ISSN 1538-4357); 869; 2; 120
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  • 8
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    Binary Black Hole Growth by Gas Accretion in Stellar Clusters (2019)
    In:  CASI
    Details
    Publication Date: 2020-01-15
    Description: We show that binaries of stellar-mass black holes formed inside a young protoglobular cluster, can grow rapidly inside the clusters core by accretion of the intracluster gas, before the gas may be depleted from the core. A black hole with mass of the order of eight solar masses can grow to values of the order of thirty five solar masses in accordance with recent gravitational waves signals observed by LIGO. Due to the black hole mass increase, a binary may also harden. The growth of binary black holes in a dense protoglobular cluster through mass accretion indicates a potentially important formation and hardening channel.
    Keywords: Astrophysics
    Type: GSFC-E-DAA-TN67184 , Astronomy & Astrophysics (ISSN 0004-6361) (e-ISSN 1432-0746); 621; L1
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  • 9
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    NICER Observation of Unusual Burst Oscillations in 4U 1728-34 (2019)
    In:  Other Sources
    Details
    Publication Date: 2020-01-15
    Description: The Neutron Star Interior Composition Explorer has observed seven thermonuclear X-ray bursts from the lowmass X-ray binary neutron star 4U 1728-34 from the start of the missions operations until 2019 February. Three of these bursts show oscillations in their decaying tail, with frequencies that are within 1 Hz of the previously detected burst oscillations from this source. Two of these burst oscillations have unusual properties: they have large fractional root mean square (rms) amplitudes of 48% 9% and 46% 9%, and they are detected only at photon energies above 6 keV. By contrast, the third detected burst oscillation is compatible with previous observations of this source, with a fractional rms amplitude of 7.7% 1.5% rms in the 0.3 to 6.2 keV energy band. We discuss the implications of these large-amplitude burst oscillations, finding that they are difficult to explain with the current theoretical models for X-ray burst tail oscillations.
    Keywords: Astrophysics
    Type: GSFC-E-DAA-TN75255 , Astrophysical Journal (ISSN 0004-637X) (e-ISSN 1538-4357); 878; 2; 145
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  • 10
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    Expanding the Sample of Radio Minihalos in Galaxy Clusters (2019)
    In:  Other Sources
    Details
    Publication Date: 2020-01-15
    Description: Radio minihalos are diffuse synchrotron sources of unknown origin found in the cool cores of some galaxy clusters. We use GMRT and VLA data to expand the sample of minihalos by reporting three new minihalo detections (A2667, A907, and PSZ1 G139.61+24.20) and confirming minihalos in five clusters (MACS J0159.80849, MACS J0329.60211, RXC J2129.6+0005, AS 780, and A3444). With these new detections and confirmations, the sample now stands at 23, the largest sample to date. For consistency, we also reanalyze archival VLA 1.4 GHz observations of seven known minihalos. We revisit possible correlations between the nonthermal emission and the thermal properties of their cluster hosts. Consistent with our earlier findings from a smaller sample, we find no strong relation between the minihalo radio luminosity and the total cluster mass. Instead, we find a strong positive correlation between the minihalo radio power and X-ray bolometric luminosity of the cool core (r 〈 70 kpc). This supplements our earlier result that most, if not all, cool cores in massive clusters contain a minihalo. Comparison of radio and Chandra X-ray images indicates that the minihalo emission is typically confined by concentric sloshing cold fronts in the cores of most of our clusters, supporting the hypothesis that minihalos arise from electron reacceleration by turbulence caused by core gas sloshing. Taken together, our findings suggest that the origin of minihalos should be closely related to the properties of thermal plasma in cluster cool cores.
    Keywords: Astrophysics
    Type: GSFC-E-DAA-TN75253 , Astrophysical Journal (ISSN 0004-637X) (e-ISSN 1538-4357); 880; 2; 70
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