Search

Your search keyword '"Quiroga S"' showing total 468 results
Start Over Author "Quiroga S"
468 results on '"Quiroga S"'

12. Bundle Theory of Improper Spin Transformations

Author

Cervantes, D. B., Quiroga, S. L., Perissinotti, L. J., and Socolovsky, M.

Subjects
Quantum Physics, Mathematical Physics
Abstract

{\it We first give a geometrical description of the action of the parity operator ($\hat{P}$) on non relativistic spin ${{1}\over{2}}$ Pauli spinors in terms of bundle theory. The relevant bundle, $SU(2)\odot \Z_2\to O(3)$, is a non trivial extension of the universal covering group $SU(2)\to SO(3)$. $\hat{P}$ is the non relativistic limit of the corresponding Dirac matrix operator ${\cal P}=i\gamma_0$ and obeys $\hat{P}^2=-1$. Then, from the direct product of O(3) by $\Z_2$, naturally induced by the structure of the galilean group, we identify, in its double cover, the time reversal operator ($\hat{T}$) acting on spinors, and its product with $\hat{P}$. Both, $\hat{P}$ and $\hat{T}$, generate the group $\Z_4 \times \Z_2$. As in the case of parity, $\hat{T}$ is the non relativistic limit of the corresponding Dirac matrix operator ${\cal T}=\gamma^3 \gamma^1$, and obeys $\hat{T}^2=-1$.}, Comment: 8 pages, Plaintex; titled changed, minor text modifications, one reference completed

Published
2004
Full Text
View/download PDF

47. OVERWHELMING GENETIC HETEROGENEITY AND EXHAUSTING MOLECULAR DIAGNOSTIC PROCESS IN CHRONIC AND PROGRESSIVE ATAXIAS: FACING IT UP WITH AN ALGORITHM, A GENE, A PANEL AT A TIME

Author

Maturo, J Perez, primary, Zavala, L, additional, Vega, P, additional, González-Morón, D, additional, Medina, N, additional, Salinas, V, additional, Rosales, J, additional, Córdoba, M, additional, Arakaki, T, additional, Garretto, N, additional, Rodríguez-Quiroga, S., additional, and Kauffman, MA, additional

Published
2020
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results