Download or read book Distorsion Gravitationnelle Ultra faible Dans Le Relev CFHTLS Wide written by Liping Fu and published by . This book was released on 2008 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: Le cisaillement gravitationnel cosmologique (ou cosmic shear) induit par les grandes structures de l'Univers engendre un champ de distorsion qui modifie l'ellipticité apparente des galaxies. Les propriétés statistiques de ce champ en fonction de l'échelle angulaire reflétent celles du spectre de puissance de la matiére noire projeté sur la ligne de visée et peuvent être exploitées pour contraindre les paramétres cosmologiques. Dans cette thése, j'explore les effets de distorsion gravitationnelle ultra-faible induits par les trés grandes échelles, d'une minute d'arc jusqu'à 4 degrés, de la distribution des structures de l'Univers. Pour cela j'utilise les données des trois premiéres années d'observation du CFHTLS Wide. Les résutats des analyses du cosmic shear apportent des contraintes fortes sur la relation entre la normalisation du spectre de puissance de la matiére, \sigma_8, et son paramétre de densité, \Omega_m. En supposant un univers plat, l'analyse de la fonction àdeux points donne \sigma_85(\Omega_m/0.25)^0.64 = 0.785 +- 0.043, en utilisant un filtre compensé de type aperture-mass et en couvrant l'ensemble des échelles [1';230']. Ces résultats sont en excellents accord avec ceux de WMAP3. Avec de telles échelles, on peut alors contraindre les paramétres cosmologiques en utilisant pour la premiére fois des mesures de cisaillement gravitationnel dans le régime linéaire.

Download or read book Quantum Mechanics Volume 3 written by Claude Cohen-Tannoudji and published by John Wiley & Sons. This book was released on 2019-12-16 with total page 790 pages. Available in PDF, EPUB and Kindle. Book excerpt: This new, third volume of Cohen-Tannoudji's groundbreaking textbook covers advanced topics of quantum mechanics such as uncorrelated and correlated identical particles, the quantum theory of the electromagnetic field, absorption, emission and scattering of photons by atoms, and quantum entanglement. Written in a didactically unrivalled manner, the textbook explains the fundamental concepts in seven chapters which are elaborated in accompanying complements that provide more detailed discussions, examples and applications. * Completing the success story: the third and final volume of the quantum mechanics textbook written by 1997 Nobel laureate Claude Cohen-Tannoudji and his colleagues Bernard Diu and Franck Laloë * As easily comprehensible as possible: all steps of the physical background and its mathematical representation are spelled out explicitly * Comprehensive: in addition to the fundamentals themselves, the books comes with a wealth of elaborately explained examples and applications Claude Cohen-Tannoudji was a researcher at the Kastler-Brossel laboratory of the Ecole Normale Supérieure in Paris where he also studied and received his PhD in 1962. In 1973 he became Professor of atomic and molecular physics at the Collège des France. His main research interests were optical pumping, quantum optics and atom-photon interactions. In 1997, Claude Cohen-Tannoudji, together with Steven Chu and William D. Phillips, was awarded the Nobel Prize in Physics for his research on laser cooling and trapping of neutral atoms. Bernard Diu was Professor at the Denis Diderot University (Paris VII). He was engaged in research at the Laboratory of Theoretical Physics and High Energy where his focus was on strong interactions physics and statistical mechanics. Franck Laloë was a researcher at the Kastler-Brossel laboratory of the Ecole Normale Supérieure in Paris. His first assignment was with the University of Paris VI before he was appointed to the CNRS, the French National Research Center. His research was focused on optical pumping, statistical mechanics of quantum gases, musical acoustics and the foundations of quantum mechanics.