167 citations · 301 across the 4 of their papers we have counts for
5 papers
Is the present expansion of the universe really accelerating?
R. G. Vishwakarma
The current observations are usually explained by an accelerating expansion of the present universe. However, with the present quality of the supernovae Ia data, the allowed parame…
Interpretations of the Accelerating Universe
J. V. Narlikar, R. G. Vishwakarma, G. Burbidge
It is generally argued that the present cosmological observations support the accelerating models of the universe, as driven by the cosmological constant or `dark energy'. We argue…
Consequences on some dark energy-candidates from the type Ia supernova SN 1997ff
R. G. Vishwakarma
We examine the status of various dark energy-models in light of the recently observed SN 1997ff at z \approx 1.7. The modified data still fit a pure cosmological constant Λor a qui…
Consequences on variable Lambda-models from distant Type Ia supernovae and compact radio sources
R. G. Vishwakarma
We study the m-z relation for Type Ia supernovae data and the θ-z relation for the updated compact radio sources data in 4 variable Λ- models: Λ\sim S^{-2}, Λ\sim H^2, Λ\sim ρand Λ…
A dark energy model resulting from a Ricci symmetry revisited
R. G. Vishwakarma
Observations of supernovae of type Ia require dark energy (some unknown exotic \emph{`matter'} of negative pressure) to explain their unexpected faintness. Whereas the simplest and…