Showing papers on "Deceleration parameter published in 1972"
TL;DR: In this paper, it was pointed out that the measurement of the deceleration parameter by Sandage (1972) implies an upper limit of a few tens of electron volts on the sum of the masses of all the possible light, stable particles that interact only weakly.
Abstract: It is pointed out that the measurement of the deceleration parameter by Sandage (1972) implies an upper limit of a few tens of electron volts on the sum of the masses of all the possible light, stable particles that interact only weakly. In the discussion of the problem, it is assumed that the universe is expanding from an initially hot and condensed state as envisaged in the 'big-bang' theories.
333 citations
TL;DR: In this paper, the dependence of information derived from a photograpbic plate on the expansion of the universe is discussed and the accuracy with which the deceleration parameter, qo, can be obtained from the redshift-magnitude relation is estimated for various telescopes.
Abstract: The dependence of information derived from a photograpbic plate on the expansion of the universe is discussed and the accuracy with which the deceleration parameter, qo, can be obtained from the redshift-magnitude relation is estimated for various telescopes. Key words: cosmology - deceleration parameter
3 citations
TL;DR: In this article, a comparison between general relativistic and Brans-Dicke cosmologies is made in terms of quantities measurable by an observational astronomer, and the difference between the two models is shown to be negligible even at large redshifts under the assumption of no galactic evolution in absolute magnitude.
Abstract: A comparison between general relativistic and Brans-Dicke cosmologies is made in terms of quantities measurable by an observational astronomer. Numerical integration of the Brans-Dicke field equations was employed to find the relationships of the mean density of cosmic matter, the age, and the time derivative of the gravitational constant to the Hubble constant and deceleration parameter. The difference between general relativistic and Brans-Dicke apparent magnitude-redshift diagrams was found to be negligible even at large redshifts under the assumption of no galactic evolution in absolute magnitude.
2 citations