IIAP Publications: Recent submissions

  • Chaos and Regularity in Adaptive Lattice Dynamics 
    Sinha, S (World Scientific Publishing Company, 1995-04)
    We describe the rich spectrum of spatio-temporal phenomena emerging from a class of models incorporating adaptive dynamics on a lattice of nonlinear (typically chaotic) elements. The investigation is based on extensive ...
  • Torsion, string tension, and topological origin of charge and mass 
    de Sabbata, V; Sivaram, C (Springer, 1995-08)
    We consider the analogy between torsion line defects and vortex lines in a superconductor to suggest that the electric charge and masses of elementary particles may have a geometrical origin. Just as the field vanishes ...
  • Earthquakes:Himalayan Seismic Hazard 
    Bilham, R; Gaur, V. K; Molnar, P (American Association for the Advancement of Science, 2001-08)
    The devastating earthquake in Bhuj on 26 January 2001 highlighted the high earthquake risk in the Indian region of Gujarat. In their Perspective, Bilham et al. warn that major earthquakes may be expected in another part ...
  • A Gap in the Highest Energy Cosmic Ray Spectrum as a Signature of Unification Scale Physics 
    Sigl, G; Lee, S; Schramm, D. N; Bhattacharjee, P (American Association for the Advancement of Science, 1995-12)
    Recent experimental data seem to indicate that there is significant structure in the cosmic ray spectrum above 1018 electron volts (eV). Besides a dip at ~5 x 1018 eV, two events above 2 x 1020 eV have been observed. The ...
  • Doppler frequency fluctuations of lower thermospheric reflections in the equatorial electrojet region 
    Sastri, J. H; Ramesh, K. B; Rao, J. V. S. V (Elsevier, 1991-07)
    The origin of short-period fluctuations from Doppler frequency-shift (P) data is investigated by examining their quantitative relationships with ambient electrojet strength and associated ionospheric conditions. The wave ...
  • Neutron interferometry in gravitational field with torsion 
    de Sabbata, Venzo; Pronin, P. I; Sivaram, C (Springer, 1991-12)
    We consider the possibility of finding experimental evidence of the fifth force with the measurement of a phase shift of neutron beams via an interferometric apparatus and also a possible rotation of the polarization plane ...
  • Gravimagnetic field, torsion, and gravitational shielding 
    de Sabbata, V; Sivaram, C (Springer, 1991-08)
    Many arguments are given in support of the existence of a gravimagnetic field in nature. Its connection with torsion is elaborated. Some consequences of the existence of such a field for effects of gravitational shielding ...
  • Response of the equatorial ionosphere in the Indian (midnight) sector to the severe magnetic storm of July 15, 2000 
    Sastri, J. H; Niranjan, K; Subbarao, K. S. V (American Geophysical Union, 2002-07)
    During the severe magnetic storm of July 15, 2000, an impulsive and remarkably large downward movement of F region occurred simultaneously at locations throughout the equatorial region (dip 0.3-20°N) in the Indian sector, ...
  • Height gradient of F region vertical drift in the evening equatorial ionosphere 
    Sastri, J. H; Varma, V. K. M; Nayar, S. R. P (American Geophysical Union, 1995-10)
    Simultaneous measurements of F-region vertical drift are made in the evening hours (1700-2100 IST) at Trivandrum (dip 0.6°N) and Kodaikanal (dip 4°N) on fifteen days during December 1993- January 1994 using the HF phase ...
  • Thermospheric meridional neutral winds associated with equatorial midnight temperature maximum (MTM) 
    Sastri, J. H; Rao, H. N. R; Somayajulu, V. V; Chandra, H (American Geophysical Union, 1994-05)
    Coordinated measurements were made on two nights in December 1992 of thermospheric temperature with a Fabry-Perot Interferometer (FPI) at Kavalur ( dip∼ 9.5° N) and of F-layer height with ionosondes at Trivandrum ( dip∼ ...
  • Solar cycle and seasonal variations in F-region vertical drifts over Kodaikanal, India 
    Ramesh, K. B; Sastri, J. H (European Geophysical Society, 1995-06)
    Measurements of the changes in phase path of F-region reflections at normal incidence at Kodaikanal (77°28'E, 10°14'N, dip 3°N) from February 1991 to February 1993 are used to determine the variation of the equatorial ...
  • Is the Quantum Mechanical Description of Physical Reality Complete? Proposed Resolution of the EPR Puzzle 
    Unnikrishnan, C. S (Springer, 2002-02)
    The question whether the quantum mechanical description of physical reality could be considered complete was asked in 1935 by Einstein, Podolsky, and Rosen. Subsequent debates and developments lead to the notion that all ...
  • Black Hole Hawking Radiation May Never Be Observed! 
    Sivaram, C (Springer, 2001-02)
    Thermal Hawking emission from black holes is a remarkable consequence of the unification of quantum physics and gravitation. Black holes of a few solar masses are the only ones which can form in the present universe. ...
  • Torsion and massive electrodynamics in the early universe 
    Sivaram, C; de Andrade, L. C. G (Springer, 1994-06)
    A recent model based on massive electrodynamics in spaces with torsion gave rise to London type equations with Meissner-like effects and photon mass. This effective photon mass can be related to a time-varying torsion ...
  • Strong Gravity and Strings 
    Sivaram, C; de Sabbata, V (Wiley InterScience, 1991)
  • Radiation of the fifth-force field 
    Bertotti, B; Sivaram, C (Springer, 1991-11)
    The «fifth-force» field, if it exists, has radiative effects in competition with the gravitational radiation. Since this field violates the Principle of Equivalence, it may affect a gravitational wave detector more than a ...
  • Abundance gradient in interstellar medium 
    Giridhar, S (Centre of Advanced Study in Astronomy Osmania University, 1984)
    The author discusses in this review the implication of observed abundance gradient in the interstellar medium on the chemical evolution of the galaxy. I describe the ingradients that are required to develop enrichment model ...
  • Abundance analysis of selected Cepheids and the galactic distribution of metallicity 
    Giridhar, S (Indian Academy of Sciences, 1983-06)
    The determinations are made in order to study the large-scale chemical inhomogeneities across the galactic disk. High-dispersion spectra are obtained of WZ Sgr, X Sgr, Zeta Gem, T Mon and SV Mon. The atmospheric abundances ...
  • Detection of an extremely active state of AM Canum Venaticorum 
    Kutty, K. R. N; Marar, T. M. K; Padmini, V. N; Seetha, S; Kasturirangan, K; Rao, U. R; Bhattacharyya, J. C; Mohin, S; Jayakumar, K (D. Reidel Publishing Co., 1986)
    We report fast photometric observations of AM Canum Venaticorum (AM CVn), the ultrashort-period, hydrogen-deficient variable, are reported. An intense flare of (Delta m) peak roughly 0.34 was detected on February 24th, ...
  • Minor planets and planetary rings 
    Bhattacharyya, J. C (Centre of Advanced Study in Astronomy Osmania University, 1984)
    Circumstances of the discovery of the first asteroid and the characteristics of various orbits followed by them have been discussed. Their shapes, compositions and evolutionary histories so far known have also been described. ...

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