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Autor:
Jayant V. Narlikar, N.C. Rana
Publikováno v:
Advances in Space Research. 20:1401-1404
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 whe
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::14eff3ad0ec428678f0d822bcf472c11
https://doi.org/10.1016/s0273-1177(97)00738-2
https://doi.org/10.1016/s0273-1177(97)00738-2
Publikováno v:
Physics Letters A. 154:9-13
The rate of lengthening of day is reanalysed from the astronomical data of Stephenson and Morrison over the period 1860–1980 and its tidal and non-tidal components are recalculated over the same period. It is found that the overall agreement is mar
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::cda7d17c50add8c377c02fef4a31ed86
https://doi.org/10.1016/0375-9601(91)90419-9
https://doi.org/10.1016/0375-9601(91)90419-9
Autor:
Pijushpani Bhattacharjee, N.C. Rana
Publikováno v:
Physics Letters B. 246:365-370
We estimate the expected flux of ultrahigh-energy (> 10{sup 18}eV) protons in the present epoch due to a process which involves collapse or multiple self-intersections of a special class of closed cosmic string loops in the universe. We compare this
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c86f27b4885225b3ea652edfa3059d42
https://doi.org/10.1016/0370-2693(90)90615-d
https://doi.org/10.1016/0370-2693(90)90615-d
Autor:
J. V. Narlikar, N.C. Rana
Publikováno v:
International Astronomical Union Colloquium. 162:32-34
A summary of work related to astronomy education carried out during the last three years in India is presented here. Since India is a huge country and many educational efforts are made by individuals alone, this report cannot be regarded as complete,
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::91541dd0220e412c1fe6a6dd90793e51
https://doi.org/10.1017/s0252921100114757
https://doi.org/10.1017/s0252921100114757
Autor:
N.C. Rana
Publikováno v:
International Astronomical Union Colloquium. 114:152-155
It is shown that a combination of the observed luminosity function of the local white dwarfs and the theoretical cooling rates of a typical white dwarf suggests an approximately constant rate of formation of the white dwarfs. This rate is found to be
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::37e475a469f49074fa04073e0fa538cc
https://doi.org/10.1017/s0252921100099486
https://doi.org/10.1017/s0252921100099486
Autor:
N.C. Rana, A. W. Wolfendale
Publikováno v:
Vistas in Astronomy. 27:199-216
A brief discussion is given of a number of topics related to the interface of cosmic rays and astronomy, notably a number of possible explanations for the diffuse extragalactic γ-ray background and the origin of the most energetic cosmic ray particl
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2e9c65b99b849ceb0b79d1611206b257
https://doi.org/10.1016/0083-6656(84)90001-1
https://doi.org/10.1016/0083-6656(84)90001-1
Autor:
N.C. Rana
Publikováno v:
Physical Review Letters. 48:209-212
It is shown that according to the standard hot-big-bang nucleosynthesis calculations, no single value of the ratio eta of baryon to the photon number density can explain the right abundances of both /sup 4/He and /sup 2/D. A slight neutrino degenerac
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::60e61a6ca8d9b573eb764212f64f64a1
https://doi.org/10.1103/physrevlett.48.209
https://doi.org/10.1103/physrevlett.48.209
Autor:
N.C. Rana, Jayant V. Narlikar
Publikováno v:
Physics Letters A. 72:75-77
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.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2343e8e45cfc0442e2ebbb875920cf8e
https://doi.org/10.1016/0375-9601(79)90651-0
https://doi.org/10.1016/0375-9601(79)90651-0
Autor:
Jayant V. Narlikar, N.C. Rana
Publikováno v:
Physics Letters A. 77:219-220
It is shown that G -varying cosmologies provide a better fit to the observed data on cosmic microwave background, than the standard Friedmann models.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5ab023bd3009a6dbf7eb45b6aaf64f01
https://doi.org/10.1016/0375-9601(80)90648-9
https://doi.org/10.1016/0375-9601(80)90648-9