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D’abord considéré comme un simple "genre-source" (du jazz et du rock notamment), le blues est désormais une musique universelle à part entière dont le succès ne se dément pas. L’histoire de cette musique est inséparable de celle des Noirs américains victimes de la ségrégation qui, d’une forme de chanson populaire, ont fait leur principal moyen d’expression. De sa naissance parmi les esclaves des grandes propriétés du Sud jusqu’à John Lee Hooker, en passant par Bessie Smith ou Elmore James, Gérard Herzhaft relate l’histoire d’une musique dont les blue-notes et les douze mesures résonnent partout dans le monde et semblent dévoiler l’essence de l’âme humaine.

Blues (Music) --- Musique noire américaine. --- Blues.

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In this book, rotation dynamics of galaxies is described using coupled field equations for the gravitational and electromagnetic fields. Relativistic frame-dragging effect is one of the consequences predicted by the general theory of relativity for rotating masses. However, except for strong gravitational sources, the spacetime dragging is too weak to produce significant modifications around rotating astrophysical systems. Here it is shown that, in the case of gravitational and magnetic field coupling, the effects of magnetic field energy density are enhanced. An outward dragging caused by the coupled effect of the magnetic field and the background spacetime can produce significant increase in the rotational velocities of galaxies. This has important implications for the missing mass problem in galactic dynamics. Other consequences of the magneto-gravitational coupling, such as galactic size, age, and the luminosity-mass relation, consolidate the model of galactic dynamics.

Gravitational fields. --- Galactic dynamics. --- Maxwell equations. --- Dark matter (Astronomy) --- Champs gravitationnels. --- Galaxies --- Maxwell, Équations de. --- Matière noire (astronomie) --- Dynamique.

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Philosophie noire américaine --- Littérature américaine --- Littérature haïtienne --- Anthologies. --- Auteurs noirs américains --- African American philosophy --- American literature --- Haitian literature --- Caribbean literature (French) --- Slavery in literature. --- Literary collections. --- African American authors --- History and criticism.

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"The first major monograph on Simone Leigh's multimedia explorations of community, Black feminism and the traditions and material cultures of the African diaspora. Over the past two decades, Simone Leigh has created artwork that situates questions of Black femme-identified subjectivity at the center of contemporary art discourse. Her sculpture, video, installation and social practice explore ideas of race, beauty and community in visual and material culture. Leigh's art addresses a wide swath of historical periods, geographies and traditions, with specific references to materials across the African diaspora, as well as forms traditionally associated with African art and architecture. This publication includes substantial new scholarship addressing Leigh's work across mediums and topics. The volume, timed with a major exhibition and national tour of the artist's work, includes contributions by her longtime collaborators, new scholars who add diverse insights and perspectives, and a conversation highlighting Leigh's voice. Additionally, generous and lushly illustrated plates feature her critically acclaimed work for the 59th Venice Biennale and works made throughout her 20-year career. A special section featuring Leigh's research images gives access to Leigh's research methodologies and encourages readers to fully engage with all aspects of Leigh's work. This monograph provides a timely opportunity to gain a holistic understanding of the complex and profoundly moving work of this groundbreaking artist." --

Leigh, Simone --- Criticism and interpretation. --- African American sculptors --- African American sculpture --- African American women artists --- African American artists --- Art, American --- Art, Modern --- Artists --- Sculpture, American --- Sculpture, Modern --- Sculpteurs noirs américains --- Sculpture noire américaine --- Femmes artistes noires américaines --- Artistes noirs américains --- Art américain --- Art --- Artistes --- Sculpture américaine --- Sculpture --- ART / General. --- 2000-2099 --- United States --- African American --- sculpture [visual works] --- assemblages [sculpture] --- installations [visual works] --- video art --- mixed media --- heads [representations] --- nimba --- human figures [visual works]