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Browsing IIAP Publications by Title

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  • Neutral fermions as the missing mass matter in galactic halos 
    Datta, B; Sivaram, C; Ghosh, S. K (Springer, 1985-04)
    Several independent considerations which rule out the hypothesis that the missing mass in galactic halos is composed of massive neutral fermions such as neutrinos, gravitinos, or photinos are discussed. It is found that ...
  • Neutrino effective charge and cerenkov radiation 
    D'Olivo, J. C; Nieves, J. F; Palash, B. P (Elsevier B.V., 1996-05)
    We consider the Čerenkov radiation emitted by neutrinos due to their effective electromagnetic interactions as they pass through a polarisable medium. The effect exists even for massless, chiral neutrinos, and no physics ...
  • Neutrino emission from supernovae in the presence of magnetic fields 
    Sivaram, C (Kluwer Academic Publishers, 1989)
    Neutrino burst observations from SN1987A indicate that the density and the temperature of the source and the propagation of the neutrinos in the medium are markedly different from those of solar and terrestrial conditions. ...
  • The neutrino magnetic moment in the early universe 
    de Sabbata, V; Sivaram, C (Italian Physical Society, 1990-05)
    The authors consider a spin-torsion coupling for neutrinos in the early universe and show that a neutrino magnetic moment can be present also for zeromass neutrinos. They make an estimate of this induced magnetic moment ...
  • Neutrino magnetic moment induced by torsion and consequences for supernova neutrinos 
    de Sabbata, V; Sivaram, C (International Cosmic Ray, 1990)
    If neutrinos couple to torsion in the frame work of the Einstein-Cartan theory, with a strength about that of the weak interaction, then the spin-torsion interaction can induce an effective neutrino magnetic moment. We ...
  • Neutrino mixing in gradational fields: Constraints on CP-Violating gravitational interactions 
    Sivaram, C (World Scientific, 1995)
  • Neutrinos from SN 1987A 
    Sivaram, C (Indian Institute of Astrophysics, 1988)
  • Neutrinos galactic dark matter and flat rotation curves 
    Sivaram, C (Copernicus Foundation for Polish Astronomy, 1987)
    Degenerate or partially degenerate density distributions of neutrinos do not give rise to flat rotation curves. If the galactic dark matter chiefly consists of neutrinos they would have to be isothermal. Such a halo of ...
  • 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 ...
  • Neutron oscillation and the primordial magnetic field 
    Sivaram, C; Krishan, V (Gordon and Breach Science Publishers, 1983)
    The phenomenon of neutron-antineutron oscillations, recently proposed as a novel consequence of grand unified theories, permits limits to be placed on any primordial field present during the nucleosynthetic stage of the ...
  • Neutron oscillation as a source of excess sub-GeV antiprotons in galactic cosmic rays 
    Sivaram, C; Krishan, V (Nature Publishing Group, 1982-09)
    The recent detection1,2 of an antiproton/proton (/p) ratio at energies much less than 1 GeV is several orders of magnitude above that predicted for production from primary cosmic ray collisions. It is well recognized that ...
  • Neutron star physics in the square kilometre array era: an Indian perspective 
    Konar, S; Bagchi, Manjari; Bandyopadhyay, Debades; Banik, Sarmistha; Bhattacharya, D; Bhattacharyya, S; Gangadhara, R. T; Gopakumar, A; Gupta, Y; Joshi, B. C; Maan, Yogesh; Maitra, Chandreyee; Mukherjee, D; Pai, Archana; Paul, B; Ray, A; Sutaria, F. K (Indian Academy of Sciences, 2016-12)
    It is an exceptionally opportune time for astrophysics when a number of next-generation mega-instruments are poised to observe the Universe across the entire electromagnetic spectrum with unprecedented data quality. The ...
  • Neutrons stars as non-accelerator hadron physics laboratory 
    Datta, B (World Scientific, 1995)
    Neutron stars are extremely compact stellar objects, with density that of atomic nucleus and higher. The composition of neutron stars is believed to be mostly neutrons, with admixtures of protons, electrons and perhaps ...
  • A new band system of BiF molecule in the region λ6200-λ7000 
    Murthy, P. S; Rao, D. V. K; Reddy, Y. P; Rao, P. T (Taylor & Francis Group, 1975)
    A reinvestigation of the electronic spectrum of BiF, has revealed the presence of a new system of bands, degraded to longer wavelengths, in the region λ6200-λ7000 Aring. The band heads could be represented by the following ...
  • New Class of Dark Matter Objects and their Detection 
    Sivaram, C; Arun, K (Bentham Open, 2011-05)
    About one-fourth of the universe is thought to consist of dark matter. Yet there is no clear understanding about the nature of these particles. Commonly discussed dark matter candidates includes the so called WIMPs or ...
  • New constants for SampsonLieske theory of the Galilean satellites of Jupiter from mutual occultation data 
    Vasundhara, R; Arlot, J. E; Descamps, P (International Astronomical Union, 1996)
    New constants for sampson-Lieske theory of the Galilean satellites have been derived using 6360 individual photographic positions (1891-1990) and 438 pseudo astrometric positions from mutual occulations during 1973,1979,1985 ...
  • New determination of abundances and stellar parameters for a set of weak G-band stars 
    Palacios, A; Jasniewicz, G; Masseron, T; Thevenin, F; Itam-Pasquet, J; Parthasarathy, M (EDP Sciences, 2016-03)
    Context. Weak G -band (wGb) stars are a very peculiar class of red giants; th ey are almost devoided of carbon and often present mild lithium enrichment. Desp ite their very puzzling abundance pa tterns, very few ...
  • A New Digital Display System for the 1-meter Telescope at Vainu Bappu Observatory 
    Srinivasan, R; Naidu, B. N (Astronomical Society of the Pacific, 1997-01)
    The Carl-Zeiss 1-meter telescope at Vainu Bappu Observatory uses synchro transmitters as angular transducers in a 3-stage geared train for the two axes coordinate display system. Synchro receivers are used in the console ...
  • A new digital spectrograph for observations of radio burst emission from the Sun 
    Ebenezer, E; Ramesh, R; Subramanian, K. R; Sundararajan, M. S; Sastry, Ch. V (EDP Sciences, 2001-03)
    A new digital spectrograph for obtaining a dynamic spectrum of radio burst emission from the Sun in the frequency range 30-80 MHz has been recently commissioned at the Gauribidanur Radio Observatory (Lat: 13degr ...
  • A new discussion on the M(v) - W(O I 7774 A) relationship for F-G stars in the light of high-resolution data 
    Arellano Ferro, A; Giridhar, S; Goswami, A (Royal Astronomical Society, 1991-05)
    High-resolution CCD data and a large group of F-G stars of fundamentally determined distances are used here to investigate the intrinsic nature of the M(v) - W(O I) relation and the effect of other atmospheric parameters ...

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