Pulsar spin down and cosmologies with varying gravity

Details Pulsar spin down and cosmologies with varying gravity Pulsar spin down and cosmologies with varying gravity

Jun 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976natur.261..560m&link_type=abstract

Nature, vol. 261, June 17, 1976, p. 560-562. Research supported by Colgate Research Council and NSF.

Physics

15

Cosmology, Gravitational Constant, Pulsars, Stellar Rotation, Angular Momentum, Atomic Clocks, Dirac Equation, Neutron Stars, Relativistic Effects, Spin Reduction, Stellar Models

Scientific paper

It is shown analytically that some cosmologies with weakening gravity are in conflict with the measured spindown of pulsar JP1953. Both gravity-changing and mass-changing cosmologies are considered to prescribe a time variation of the dimensionless gravitational coupling constant, and exact polytrope models constructed for an arbitrarily relativistic degenerate zero-temperature star are analyzed to obtain a firm lower limit to the spindown rate by setting all electromagnetic losses to zero. The results indicate that the cosmologies of Dirac (1937) and Hoyle and Narlikar (1971) give a maximum inverse spindown rate that is lower than the measured value for JP1953. It is also found that cosmologies in which gravity increases with time are consistent with pulsar data and offer a natural explanation for the lack of long-period pulsars.

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