You need JavaScript to view this

White dwarfs, the galaxy and Dirac's cosmology

Journal Article:

Abstract

Reference is made to the apparent absence, or deficiency, of white dwarfs fainter than about 10/sup -4/L solar mass. An explanation is here proposed on the basis of Dirac's cosmological hypothesis that the gravitational constant, G, has varied with the time elapsed since the beginning of the expansion of the Universe as t/sup -1/ and the number of particles in the Universe has increases as t/sup 2/, if the measurements are made in atomic units. For a white dwarf the Chandrasekhar mass limit is a collection of fundamental constants proportional to Gsup(-3/2) and therefore increases with time as tsup(3/2). In the 'additive' version of Dirac's theory the actual mass, M, of a relatively small object like a star remains essentially unchanged by the creation of new matter in the Universe and hence a white dwarf will become more stable with the course of time; but in the 'multiplicative' version of the theory, M increases as t/sup 2/ and may eventually exceed the Chandrasekhar limit, and if this happens, gravitational collapse of the white dwarf into an invisible black hole or neutron star will quickly occur. It is considered interesting to find whether the 'multiplicative' theory may have a bearing on  More>>
Authors:
Stothers, R [1] 
  1. National Aeronautics and Space Administration, Greenbelt, Md. (USA). Goddard Space Flight Center
Publication Date:
Aug 05, 1976
Product Type:
Journal Article
Reference Number:
AIX-08-280144; EDB-77-039122
Resource Relation:
Journal Name: Nature (London); (United Kingdom); Journal Volume: 262:5568
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; COSMOLOGICAL MODELS; STAR EVOLUTION; GALACTIC EVOLUTION; WHITE DWARF STARS; CHANDRASEKHAR THEORY; DIRAC COSMOLOGY; LUMINOSITY; MASS; MILKY WAY; TIME DEPENDENCE; COSMOLOGY; DWARF STARS; GALAXIES; MATHEMATICAL MODELS; OPTICAL PROPERTIES; PHYSICAL PROPERTIES; STARS; 640102* - Astrophysics & Cosmology- Stars & Quasi-Stellar, Radio & X-Ray Sources; 640105 - Astrophysics & Cosmology- Galaxies; 640106 - Astrophysics & Cosmology- Cosmology
OSTI ID:
7236642
Country of Origin:
United Kingdom
Language:
English
Other Identifying Numbers:
Journal ID: CODEN: NATUA
Submitting Site:
INIS
Size:
Pages: 477-479
Announcement Date:

Journal Article:

Citation Formats

Stothers, R. White dwarfs, the galaxy and Dirac's cosmology. United Kingdom: N. p., 1976. Web. doi:10.1038/262477a0.
Stothers, R. White dwarfs, the galaxy and Dirac's cosmology. United Kingdom. doi:10.1038/262477a0.
Stothers, R. 1976. "White dwarfs, the galaxy and Dirac's cosmology." United Kingdom. doi:10.1038/262477a0. https://www.osti.gov/servlets/purl/10.1038/262477a0.
@misc{etde_7236642,
title = {White dwarfs, the galaxy and Dirac's cosmology}
author = {Stothers, R}
abstractNote = {Reference is made to the apparent absence, or deficiency, of white dwarfs fainter than about 10/sup -4/L solar mass. An explanation is here proposed on the basis of Dirac's cosmological hypothesis that the gravitational constant, G, has varied with the time elapsed since the beginning of the expansion of the Universe as t/sup -1/ and the number of particles in the Universe has increases as t/sup 2/, if the measurements are made in atomic units. For a white dwarf the Chandrasekhar mass limit is a collection of fundamental constants proportional to Gsup(-3/2) and therefore increases with time as tsup(3/2). In the 'additive' version of Dirac's theory the actual mass, M, of a relatively small object like a star remains essentially unchanged by the creation of new matter in the Universe and hence a white dwarf will become more stable with the course of time; but in the 'multiplicative' version of the theory, M increases as t/sup 2/ and may eventually exceed the Chandrasekhar limit, and if this happens, gravitational collapse of the white dwarf into an invisible black hole or neutron star will quickly occur. It is considered interesting to find whether the 'multiplicative' theory may have a bearing on the apparent deficiency of faint white dwarfs, and to consider whether there are any possible consequences for galactic evolution. This is here discussed.}
doi = {10.1038/262477a0}
journal = {Nature (London); (United Kingdom)}
volume = {262:5568}
journal type = {AC}
place = {United Kingdom}
year = {1976}
month = {Aug}
}