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Galaxies --- Astrometry --- Astrophysics --- Supercomputers --- Stellar dynamics --- Data processing --- Congresses.

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Galaxies, along with their underlying dark matter halos, constitute the building blocks of structure in the Universe. Of all fundamental forces, gravity is the dominant one that drives the evolution of structures from small density seeds at early times to the galaxies we see today. The interactions among myriads of stars, or dark matter particles, in a gravitating structure produce a system with fascinating connotations to thermodynamics, with some analogies and some fundamental differences. Ignacio Ferrer as presents a concise introduction to extragalactic astrophysics, with emphasis on stellar dynamics, and the growth of density fluctuations in an expanding Universe. Additional chapters are devoted to smaller systems (stellar clusters) and larger ones (galaxy clusters). Fundamentals of Galaxy Dynamics, Formation and Evolution is written for advanced undergraduates and beginning postgraduate students, providing a useful tool to get up to speed in a starting research career. Some of the derivations for the most important results are presented in detail to enable students appreciate the beauty of maths as a tool to understand the workings of galaxies. Each chapter includes a set of problems to help the student advance with the material. Praise for Fundamentals of Galaxy Dynamics, Formation and Evolution ‘Dr Ferreras strikes gold here with a precisely targeted exposition of the essentials in galactic studies. Clearly derived from the extensive experience that he and his colleagues at both Oxford and UCL have gathered in teaching this material, it precisely fulfils the needs of advanced undergraduate and postgraduate scholars. 'Duncan S. MacKay, Centre for Astrophysics & Planetary Science, University of Kent.

Science --- Astronomy. --- Natural science --- Natural sciences --- Science of science --- Sciences --- Galaxies --- Stellar dynamics. --- Astrophysics. --- Formation. --- Evolution. --- Galactic evolution --- Galaxy evolution --- Evolution --- Galaxy mergers --- Astronomical physics --- Astronomy --- Cosmic physics --- Physics --- Dynamics, Stellar --- Stars --- Celestial mechanics --- Formation, Galactic --- Formation of galaxies --- Galactic formation --- Galaxy formation --- Formation --- Dynamics

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The first detection on Earth of a gravitational wave signal from the coalescence of a binary black hole system in 2015 established a new era in astronomy, allowing the scientific community to observe the Universe with a new form of radiation for the first time. More than five years later, many more gravitational wave signals have been detected, including the first binary neutron star coalescence in coincidence with a gamma ray burst and a kilonova observation. The field of gravitational wave astronomy is rapidly evolving, making it difficult to keep up with the pace of new detector designs, discoveries, and astrophysical results. This Special Issue is, therefore, intended as a review of the current status and future directions of the field from the perspective of detector technology, data analysis, and the astrophysical implications of these discoveries. Rather than presenting new results, the articles collected in this issue will serve as a reference and an introduction to the field. This Special Issue will include reviews of the basic properties of gravitational wave signals; the detectors that are currently operating and the main sources of noise that limit their sensitivity; planned upgrades of the detectors in the short and long term; spaceborne detectors; a data analysis of the gravitational wave detector output focusing on the main classes of detected and expected signals; and implications of the current and future discoveries on our understanding of astrophysics and cosmology.

Research & information: general --- Physics --- LIGO --- Virgo --- KAGRA --- gravitational waves --- detector characterization --- data quality --- noise mitigation --- seismic noise --- Newtonian noise --- seismic isolation system --- noise subtraction --- DECIGO --- thermal noise --- quantum noise --- diffraction loss --- interferometers --- ground based gravitational-wave detector --- Advanced Virgo --- gravitational-wave backgrounds --- stochastic gravitational-wave backgrounds --- stochastic searches of gravitational waves --- gravitational-wave laser interferometers --- pulsar timing arrays --- gravitational wave detectors --- optomechanics --- low-noise high-power laser interferometry --- calibration --- interferometer --- gravitational wave --- astrophysics --- laser metrology --- squeezed states --- quantum optics --- gravitational wave detector --- laser interferometer --- cryogenics --- underground --- einstein telescope --- newtonian noise --- coating noise --- silicon --- suspensions --- payload --- cryostat --- core-collapse supernova --- future detectors --- continuous gravitational waves --- neutron stars --- dark matter --- gravitational-wave astrophysics --- stars --- black holes --- stellar evolution --- binary stars --- stellar dynamics --- laser interferometers --- n/a