Browsing by Author "Rana, N. C."

Filter results by typing the first few letters
Now showing 1 - 7 of 7
  • No Thumbnail Available
    Item
    Cosmic microwave background spectrum and G-varying cosmology
    (Elsevier Science Publishers, 1980-03-19) Narlikar, J. V.; Rana, N. C.
    It is shown that G-varying cosmologies provide a better fit to the observed data on cosmic microwave background, than the standard Friedmann models.
  • No Thumbnail Available
    Item
    Cosmic microwave background spectrum in the Hoyle-Narlikar cosmology
    (Elsevier Science Publishers, 1983-11-21) Narlikar, J. V.; Rana, N. C.
    It is shown that the theoretical curve of relic radiation in the G-varying Hoyle-Narlikar cosmology provides an accep- table fit to the observations at long as well as short wavelengths.
  • No Thumbnail Available
    Item
    Education in astronomy and astrophysics: the Indian experience
    (Elsevier Science Publishers, 1997-08-22) Narlikar, J. V.; Rana, N. C.
    In the context of a vast region with one-sixth of the global population, the Indian subcontinent has a very rich tradition of teaching of astronomy as a science. The so called modern astronomy has mostly been developed over the past two centuries whereas the subject of astrophysics is barely a hundred years old. This work reviews briefly the current efforts in India in propagating these subjects not only at the research level but all the way down to the level of school children. With the creation of IUCAA, these efforts have been systematized and the response to them has been very rewarding.
  • No Thumbnail Available
    Item
    Hawking process and the cosmic microwave background in a steady state universe
    (Elsevier, 1979-06-25) Narlikar, J. V.; Rana, N. C.
    It is investigated whether a large number of primordial black holes can account for the observed microwave background in a steady state universe.The answer is shown to be negative.
  • No Thumbnail Available
    Item
    India: A status report on teaching of astronomy in India
    (Cambridge University Press, 1998-09-19) Narlikar, J. V.; Rana, N. C.
  • No Thumbnail Available
    Item
    Newtonian N-body calculations of the advance of Mercury's perihelion
    (Royal Astronomical Society, 1985-01-10) Narlikar, J. V.; Rana, N. C.
  • No Thumbnail Available
    Item
    On the missing interstellar comets
    (2014-11-23) Sen, A.K.; Rana, N. C.
    Comets are supposed to have been born in the outer part of the solar nebula and later thrown into their present location of the Oort cloud by perturbations of the giant planets. This process was inefficient and the majority of the comets were totally lost into the interstellar medium, instead of being trapped in the Oort cloud. Assuming stars in the solar neighbourhood to have formed in the same way as the Sun, one can find the number of interstellar comets and also estimate the expected number of detectable interstellar comets (McGlynn & Chapman 1989). In this work, using our present day knowledge of the local interstellar medium, we first calculate the population of interstellar comets within the past 150 year or so, is therefore nothing unusual and fully consistent with the existing models of the oort cloud and solar system formation.