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Browsing IIAP Publications by Subject "Computational Astrophysics"

Browsing IIAP Publications by Subject "Computational Astrophysics"

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  • Discrete space theory of radiative transfer 
    Peraiah, A (Cambridge University Press, 1984)
    A discrete space theory for radiative transfer based on invariant imbedding is described, along with applications. An interaction principle is defined for the relation between incident and emitted radiation from an optically ...
  • Distribution of stars perpendicular to the plane of the Galaxy 
    Chatterjee, S (Indian Academy of Sciences, 1991-12)
    A detailed calculation is given of the distribution of mass above the Galactic plane for any arbitrary mass distribution and velocity distribution. It is shown that an analytic expression can be found for the gravitational ...
  • Dynamical friction and the escape of a compact supermassive object shot from the center of a galaxy 
    Kapoor, R. C (D. Reidel Publishing Company, 1985-12)
    A numerical study has been made of the motion of a compact object consisting of a supermassive black hole with a dense cluster of stars around through a galaxy which has recoiled from the center of the latter as a result ...
  • The effects of aberration and advection in plane-parallel and absorbing media 
    Peraiah, A (Springer, 1989-09)
    We have calculated the changes that would occur in mean intensity due to the presence of aberration and advection terms in radiative transfer equation. We have considered an absorbing medium with velocities 1000, 2000, ...
  • Energy exchange during collision of a pair of disc-sphere galaxies 
    Namboodiri, P. M. S; Kochhar, R. K (Kluwer Academic Publishers, 1989-02)
    We have considered the collision of a pair of disc-sphere galaxies under the impulsive approximation to study the variation of the energy change of the disc due to the passage of a spherical galaxy. Various collision ...
  • High speed photometry of PG 1012-029 
    Ashoka, B. N; Seetha, S; Marar, T. M. K; Kasturirangan, K; Rao, U. R; Bhattacharyya, J. C (European Southern Observatory, 1994-03)
    High speed optical photometric observations of PG 1012 - 029, conducted during 1990-1991, confirm the nova-like classification of the object. Several eclipses observed by us have been used to refine the orbital period of ...
  • The need for an energy-dependent torsion-coupling constant in the early universe 
    de Sabbata, V; Sivaram, C (Springer, 1989-08)
    The torsion-coupling constant (which depends on energy as E exp -2) can pass through the values of the coupling constants of the other interactions during the evolution of the universe. An energy-dependent torsion-coupling ...
  • Non-zero rest mass neutrinos and the cosmological constant 
    Sivaram, C (Kluwer Academic Publisher, 1985-11)
    Recently it was pointed out that a non-zero cosmological constant can play a role in the formation of neutrino halos only in the case of neutrinos of very low rest mass (mν ≤ 0.1 eV). However, phase-space considerations ...
  • Non-zero rest mass neutrinos and the cosmological constant 
    Sivaram, C (Kluwer Academic Publishers, 1985-11)
    Recently it was pointed out that a non-zero cosmological constant can play a role in the formation of neutrino halos only in the case of neutrinos of very low rest mass (mν ≤ 0.1 eV). However, phase-space considerations ...
  • Solution of radiative transfer equation with spherical-symmetry in partially scattering medium 
    Peraiah, A; Varghese, B. A (D. Reidel Publishing Co., 1985-01)
    The authors have solved the equation of radiative transfer in spherical symmetry with scattering and absorbing medium. They have set the albedo for single scattering to be equal to 0.5. They have set the Planck function ...
  • Supercritical winds from cool 'canonical' stars caused by evolution on the main sequence 
    Venkatakrishnan, P (D. Reidel Publishing Co., 1986-02)
    Even the very slow expansion of a star's radius due to evolution on the Main Sequence is shown to be supercritical for cool stars without coronae. Since steady sphericaily-symmetric supercitical solutions are theoretically ...
  • Torsion and the cosmological constant problem 
    de Sabbata, V; Sivaram, C (Springer, 1990-03)
    A promising possibility which has yet to be considered with a view to furthering understanding of the cosmological constant problem is the use of torsion in a framework such as that of Einstein-Cartan theory: as would be ...
  • Torsion, minimum time, string tension and its physical implications in cosmology 
    de Sabbata, Venzo; Sivaram, C (Springer, 1992-01)
    By introducing torsion in general relativity - that is physically considering the effect of the spin and linking the torsion to defects in the space-time topology - a minimum unit of time can be obtained. In this context ...

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