J.P. MCEVOY

An ideal introduction [to Stephen Hawking] - IndependentAstonishingly comprehensive - clearer than Hawking himself - Focus Stephen Hawking was a world-famous physicist with a cameo in The Simpsons on his CV, but outside of his academic field his work was little understood. To the public he was a tragic figure - a brilliant scientist and author of the 9 million-copy-selling A Brief History of Time, and yet spent the majority of his life confined to a wheelchair and almost completely paralysed. Hawkings major contribution to science was to integrate the two great theories of 20th-century physics: Einsteins General Theory of Relativity and Quantum Mechanics. J.P. McEvoy and Oscar Zarates brilliant graphic guide explores Hawkings life, the evolution of his work from his days as a student, and his breathtaking discoveries about where these fundamental laws break down or overlap, such as on the edge of a Black Hole or at the origin of the Universe itself.

Quantum theory confronts us with bizarre paradoxes which contradict the logic of classical physics. At the subatomic level, one particle seems to know what the others are doing, and according to Heisenbergs "uncertainty principle", there is a limit on how accurately nature can be observed. And yet the theory is amazingly accurate and widely applied, explaining all of chemistry and most of physics.Introducing Quantum Theory takes us on a step-by-step tour with the key figures, including Planck, Einstein, Bohr, Heisenberg and Schrodinger. Each contributed at least one crucial concept to the theory. The puzzle of the wave-particle duality is here, along with descriptions of the two questions raised against Bohrs "Copenhagen Interpretation" - the famous "dead and alive cat" and the EPR paradox. Both remain unresolved.

Stephen Hawking est lun des physiciens britanniques contemporains les plus connus dans le monde. Outre son destin tragique, il est connu pour ses travaux de recherche dans les domaines de la cosmologie et de la gravite quantique en particulier dans le cadre des trous noirs.Il est egalement auteur du celebre livre de vulgarisation scientifique vendu a plus de 9 millions dexemplaires Une breve histoire du temps .Retrouvez a travers cet ouvrage graphique les moments-cles de sa vie et de ses travaux et a travers eux les theories les plus actuelles en physique.

La théorie quantique nous confronte avec les paradoxes bizarres qui contredisent les fondements de la physique classique.Au niveau subatomique, une particule semble savoir ce que font les autres, mais selon le principe dincertitude de Heisenberg, il y a une limite sur la precision des observations.Pourtant, la theorie quantique est etonnamment precise et largement appliquee en chimie et en physique. Cet ouvrage nous emmene dans un voyage ou vous rencontrerez Planck, Einstein, Bohr, Heisenberg et Schrodinger, chacun dentre eux ayant contribue aux concepts de cette theorie revolutionnaire.La dualite onde-particule, linterpretation de Copenhague, le chat de Schrodinger, le paradoxe EPR etc. sont autant dexperiences et de concepts qui sont decrits dans cet ouvrage.

J P McEvoy looks at remarkable phenomenon of a solar eclipse through a thrilling narrative that charts the historical, cultural and scientific relevance of solar eclipses through the ages and explores the significance of this rare event. In the year when Britain will be touched by a solar eclipse for the first time since 1927, J P McEvoy looks at this remarkable phenomenon through a thrilling narrative that charts the historical, cultural and scientific relevance of solar eclipses through the ages and explores the significance of this rare event. Eclipse shows how the English Astronomer Norman Lockyer named the element Helium from the spectra of the eclipsed Sun, and how in Cambridge Arthur Eddinton predicted the proof of Einsteins General Relativity from the bending of sunlight during the famous African eclipse of 1919. During late morning on 11 August, 1999 the shadow of the last total eclipse of the Millennium will cut across the Cornwall Peninsula and skirt the coast of Devon before moving on to the continent, ending its journey at sunset in the Bay of Bengal, India. Britains next eclipse will be in September, 2090. Throughout history, mankind has exhibited a changing response to the eclipse of the sun. The ancient Mexicans believed the Sun and the Moon were quarrelling whilst the Tahitians thought the two celestial objects were making love. Today, astronomers can calculate the exact path the moons shadow will track during the solar eclipse. As millions encamp for the brief spectacle with mylar glasses, pin-hole cameras, binoculars and telescopes, space agency satellites and mountain-top observatories study the corona, flares and the magnetosphere of the Sun as the 125 mile-wide black patch zooms along the ground at 2000 mph.

Since the dawn of humanity, men have attempted to divine the nature of the heavens. The first astronomers mapped the movement of the seasons and used the positions of the constellations for augurs and astrology. Today, the search goes ever deeper into the nature of reality and life itself. In this accessible overview, astrophysicist J.P. McEvoy tells the story of how our knowledge of the cosmos has developed. He puts in context many of the greatest discoveries of all time and many of the dominant personalities: Aristotle, Copernicus, and Isaac Newton, and as we approach the modern era, Einstein, Eddington, and Hawking.