![Loading...](https://link.springer.com/static/c4a417b97a76cc2980e3c25e2271af3129e08bbe/images/pdf-preview/spacer.gif)
-
Article
Hamilton’s theory of turns revisited
We present a new approach to Hamilton’s theory of turns for the groups SO(3) and SU(2) which renders their properties, in particular their composition law, nearly trivial and immediately evident upon inspection. ...
-
Article
The structure of states and maps in quantum theory
The structure of statistical state spaces in the classical and quantum theories are compared in an interesting and novel manner. Quantum state spaces and maps on them have rich convex structures arising from t...
-
Article
Ray space ‘Riccati’ evolution and geometric phases for N-level quantum systems
We present a simple derivation of the matrix Riccati equations governing the reduced dynamics as one descends from the group $$ \mathb...
-
Article
Wigner distributions for finite dimensional quantum systems: An algebraic approach
We discuss questions pertaining to the definition of ‘momentum’, ‘momentum space’, ‘phase space’ and ‘Wigner distributions’; for finite dimensional quantum systems. For such systems, where traditional concepts...
-
Article
The KOSMA large-scale CO survey of clouds in the Galactic Molecular Ring
We present the status of the KOSMA large-scale observations of clouds in the Galactic Molecular Ring (GMR) in CO J=3-2, 2-1 and 13CO 2-1 following up on the BU-FCRAO 13CO 1-0 survey. The GMR is one of the promine...
-
Chapter and Conference Paper
The BU-FCRAO Galactic Ring Survey
Using the SEQUOIA multi-pixel array receiver on the Five College Radio Astronomy Observatory (FCRAO) 14 m telescope, we are conducting a new molecular line survey of the inner Galaxy. The Boston University (BU...
-
Chapter and Conference Paper
The Distribution of MSX Dark Clouds in the Inner Milky Way
Recent high resolution surveys with the ISO and MSX satellites have revealed a large number of Galactic clouds with significant extinction in the midinfrared. The infrared dark clouds are characterized by their h...
-
Chapter and Conference Paper
The Bu-Fcrao Galactic Ring Survey
The Galactic Ring Survey (GRS) will be a new high resolution, sensitive map of the distribution of 13CO(1 → 0) emission in the Inner Milky Way. Technical details and GRS data can be found at www.bu.edu/grs/.
-
Chapter and Conference Paper
The KOSMA Multi-line CO Survey of Clouds in the Galactic Molecular Ring
The Milky Way is known to be a spiral barred galaxy with a prominent ring between 4 and 7 kpc Galactocentric radius (Scoville & Solomon 1975; Clemens et al. 1988). Ring resonances occur frequently in barred sp...
-
Chapter and Conference Paper
The Carbon Content in the Galactic CygnusX/DR21 Star Forming Region
Observations of Carbon bearing species are among the most important diagnostic probes of ongoing star formation. CO is a surrogate for H2 and is found in the vicinity of star formation sites. There, [CI] emission...
-
Article
The real symplectic groups in quantum mechanics and optics
We present a utilitarian review of the family of matrix groups Sp(2n, ℛ), in a form suited to various applications both in optics and quantum mechanics. We contrast these groups and their geometry with the much m...
-
Chapter and Conference Paper
Observations of interstellar CN, 13CN and C15N
-
Article
Hamilton’s theory of turns and a new geometrical representation for polarization optics
Hamilton’s theory of turns for the group SU(2) is exploited to develop a new geometrical representation for polarization optics. While pure polarization states are represented by points on the Poincaré sphere,...
-
Article
Generalized pencils of rays in statistical wave optics
The recently introduced generalized pencil of Sudarshan which gives an exact ray picture of wave optics is analysed in some situations of interest to wave optics. A relationship between ray dispersion and stat...
-
Article
Convective stability in magnetic stars
Dynamical stability of a static axisymmetrical magnetic star with respect to high-order modes of oscillation is investigated by means of the energy method, neglecting the Eulerian perturbation of gravity. The ...
-
Article
Spiral structure and hydrodynamic gravitational resonance
A persistent and large scale galactic spiral structure might be the result of resonant excitation of density waves, forced in the low viscosity interstellar gas, by the gravitational field of an asymmetric ste...