Physics – Quantum Physics
Scientific paper
2006-07-11
Physics
Quantum Physics
16 pages, 10 figures
Scientific paper
10.1007/s10773-007-9508-x
Normally ordered forms of functions of boson operators are important in many contexts in particular concerning Quantum Field Theory and Quantum Optics. Beginning with the seminal work of Katriel [Lett. Nuovo Cimento, 10(13):565--567, 1974], in the last few years, normally ordered forms have been shown to have a rich combinatorial structure, mainly in virtue of a link with the theory of partitions. In this paper, we attempt to enrich this link. By considering linear representations of noncrossing partitions, we define the notion of noncrossing normal ordering. Given the growing interest in noncrossing partitions, because of their many unexpected connections (like, for example, with free probability), noncrossing normal ordering appears to be an intriguing notion. We explicitly give the noncrossing normally ordered form of the functions (a^{r}(a^{\dag})^{s})^{n}) and (a^{r}+(a^{\dag})^{s})^{n}, plus various special cases. We are able to establish for the first time bijections between noncrossing contractions of these functions, k-ary trees and sets of lattice paths.
Mansour Toufik
Schork Matthias
Severini Simone
No associations
LandOfFree
Noncrossing normal ordering for functions of boson operators does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Noncrossing normal ordering for functions of boson operators, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Noncrossing normal ordering for functions of boson operators will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-168653