164 research outputs found
Master Integrals, Superintegrability and Quadratic Algebras
In this paper we use a generalization of Oevel's theorem about master
symmetries to relate them with superintegrability and quadratic algebras
Algebraically Linearizable Dynamical Systems
The main result of this paper is the evidence of an explicit linearization of
dynamical systems of Ruijsenaars-Schneider type and of the perturbations
introduced by F. Calogero of these systems with all orbits periodic of same
period. Several other systems share the existence of this explicit
linearization, among them, the Calogero-Moser system (with and without external
potential) and the Calogero-Sutherland system. This explicit linearization is
compared with the notion of maximal superintegrability which has been discussed
in several articles.Comment: 11 pages, Late
Quadratic Algebra associated with Rational Calogero-Moser Models
Classical Calogero-Moser models with rational potential are known to be
superintegrable. That is, on top of the r involutive conserved quantities
necessary for the integrability of a system with r degrees of freedom, they
possess an additional set of r-1 algebraically and functionally independent
globally defined conserved quantities. At the quantum level, Kuznetsov
uncovered the existence of a quadratic algebra structure as an underlying key
for superintegrability for the models based on A type root systems. Here we
demonstrate in a universal way the quadratic algebra structure for quantum
rational Calogero-Moser models based on any root systems.Comment: 19 pages, LaTeX2e, no figure
Algebraically linearizable dynamical systems
The main result of this paper is the evidence of an explicit linearization
of dynamical systems of Ruijsenaars-Schneider (RS) type and of the perturbations
introduced by F. Calogero of these systems with all orbits periodic
of same period. Several other systems share the existence of this explicit
linearization, among them, the Calogero-Moser system (with and without
external potential) and the Calogero-Sutherland system. This explicit linearization
is compared with the notion of maximal superintegrability which
has been discussed in several articles (to quote few of them, Hietarinta [12],
Henon [11], Harnad-Winternitz [10], S. Wojchiechowsky [15])
Atypical presentation of erythema multiforme
info:eu-repo/semantics/publishedVersio
Application of imaging guidelines in patients with foreign body ingestion or inhalation: literature review
Ingestion, inhalation, and insertion of foreign bodies (FBs) are very common clinical occurrences. In any case, early diagnosis and prompt management are mandatory to avoid severe and life-threatening complications. Radiologists have an important role in revealing the presence, dimension, nature, and relationship with anatomical structures of a FB; selecting the most appropriate imaging modality; and enabling the best therapeutic choice. This review article focuses on the most frequent FBs ingested, inhaled, and inserted and presents the different tests and investigations to provide a correct radiological approach
Congenital cystic lesions of the biliary tree
OBJECTIVE: The purpose of this essay is to illustrate the imaging findings of congenital cystic lesions of the biliary tract. CONCLUSION: Congenital cystic lesions of the biliary tract include ductal plate malformations and choledochal cysts and can be recognized with characteristic imaging findings and basic knowledge of the embryologic development of the biliary tree
Observations of the post shock break-out emission of SN 2011dh with XMM-Newton
After the occurrence of the type cIIb SN 2011dh in the nearby spiral galaxy M
51 numerous observations were performed with different telescopes in various
bands ranging from radio to gamma-rays. We analysed the XMM-Newton and Swift
observations taken 3 to 30 days after the SN explosion to study the X-ray
spectrum of SN 2011dh. We extracted spectra from the XMM-Newton observations,
which took place ~7 and 11 days after the SN. In addition, we created
integrated Swift/XRT spectra of 3 to 10 days and 11 to 30 days. The spectra are
well fitted with a power-law spectrum absorbed with Galactic foreground
absorption. In addition, we find a harder spectral component in the first
XMM-Newton spectrum taken at t ~ 7 d. This component is also detected in the
first Swift spectrum of t = 3 - 10 d. While the persistent power-law component
can be explained as inverse Compton emission from radio synchrotron emitting
electrons, the harder component is most likely bremsstrahlung emission from the
shocked stellar wind. Therefore, the harder X-ray emission that fades away
after t ~ 10 d can be interpreted as emission from the shocked circumstellar
wind of SN 2011dh.Comment: Accepted for publication as a Research Note in Astronomy and
Astrophysic
Algebraic Linearization of Dynamics of Calogero Type for any Coxeter Group
Calogero-Moser systems can be generalized for any root system (including the
non-crystallographic cases). The algebraic linearization of the generalized
Calogero-Moser systems and of their quadratic (resp. quartic) perturbations are
discussed.Comment: LaTeX2e, 13 pages, no figure
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