Paul Adrien Maurice Dirac was an English theoretical physicist whose work fundamentally shaped the early development of quantum mechanics and quantum electrodynamics. His discoveries, including the Dirac equation describing fermion behavior and the prediction of antimatter, profoundly altered our understanding of the atomic world. Awarded the Nobel Prize in Physics for his atomic theory discoveries, his contributions to reconciling general relativity with quantum mechanics remain a subject of study.
Einstein's general theory of relativity requires a curved space for the description of the physical world. This title comprises thirty-five compact chapters that takes the reader point-by-point through the necessary steps for understanding general relativity.
Four concise, brilliant lectures on mathematical methods by the Nobel Laureate and quantum pioneer begin with an introduction to visualizing quantum theory through the use of classical mechanics. The remaining lectures build on that idea, examining the possibility of building a relativistic quantum theory on curved surfaces or flat surfaces.
Le sommaire suit les points qu’à la veille de sa présidence l’Allemagne a mis en exergue : la maîtrise de la crise sanitaire ; le budget de l’Union européenne ; le changement climatique ; la transformation numérique ; la politique migratoire ; le Brexit ; la politique de sécurité commune. Au-delà de ces points que la chancelière allemande, Angela Merkel, a place au centre la présidence allemande, le dossier s’interroge également sur la question du respect de l’Etat de droit au sein de l’UE, les relations avec la Chine et avec l’Afrique et il ouvre une perspective vers la présidence française qui interviendra en 2022.