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19 Result(s)

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  1. No Access

    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. ...

    N. Mukunda, S. Chaturvedi, R. Simon in Pramana (2010)

  2. No Access

    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...

    Sudhavathani Simon, S. P. Rajagopalan, R. Simon in Pramana (2009)

  3. No Access

    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...

    S. Chaturvedi, E. Ercolessi, G. Marmo, G. Morandi, N. Mukunda, R. Simon in Pramana (2007)

  4. No Access

    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...

    S. Chaturvedi, E. Ercolessi, G. Marmo, G. Morandi, N. Mukunda, R. Simon in Pramana (2005)

  5. No Access

    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...

    M. Brüll, C. Kramer, V. Ossenkopf, R. Simon, J. Stutzki in Astrophysics and Space Science (2004)

  6. No Access

    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...

    R. Simon, J. M. Jackson, R. Shah, J. Rathborne… in The Dense Interstellar Medium in Galaxies (2004)

  7. No Access

    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...

    R. Simon, J. M. Jackson, T. M. Bania… in The Dense Interstellar Medium in Galaxies (2004)

  8. No Access

    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...

    M. Brüll, C. Kramer, V. Ossenkopf, J. Stutzki… in The Dense Interstellar Medium in Galaxies (2004)

  9. No Access

    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...

    H. Jakob, R. Simon, C. Kramer, B. Mookerjea… in The Dense Interstellar Medium in Galaxies (2004)

  10. No Access

    Chapter

    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...

    M. Brüll, C. Kramer, V. Ossenkopf, R. Simon… in From Observations to Self-Consistent Model… (2004)

  11. No Access

    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...

    Arvind, B Dutta, N Mukunda, R Simon in Pramana (1995)

  12. No Access

    Chapter and Conference Paper

    Observations of interstellar CN, 13CN and C15N

    R. Simon, A. H. Saleck, N. Schneider… in The Physics and Chemistry of Interstellar … (1995)

  13. No Access

    Chapter

    The Two-Dimensional Symplectic and Metaplectic Groups and Their Universal Cover

    We give a detailed discussion of the group Sp(2, R), organized in such a way as to lead to explicit constructive descriptions of the metaplectic group Mp(2) and the universal covering group

    R. Simon, N. Mukunda in Symmetries in Science VI (1993)

  14. No Access

    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,...

    R Simon, N Mukunda, ECG Sudarshan in Pramana (1989)

  15. No Access

    Chapter and Conference Paper

    Present Status and Future Plans for the Two Color Astrometric Interferometer Project

    A 3-meter two telescope stellar interferometer has been used to observe fringes for the past year in order to study the feasibility of using long baseline interferometers for astrometry. We have demonstrated t...

    M. Shao, M. Colavita, D. Staelin, R. Simon, K. Johnston in Astrometric Techniques (1986)

  16. No Access

    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...

    R Simon in Pramana (1983)

  17. No Access

    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 ...

    R. Simon in Astrophysics and Space Science (1980)

  18. No Access

    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...

    R. Simon in Astrophysics and Space Science (1974)

  19. No Access

    Chapter and Conference Paper

    Rotational Perturbation of a Radial Oscillation in a Gaseous Star

    The perturbation method has been applied to the problem of the oscillations of a gaseous star rotating around a fixed z-axis according to a general law of the type

    R. Simon in Stellar Rotation (1970)