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Pulsars and Gravity

R.N. Manchester
(
- Australia, CSIRO, Epping
)

Feb 19, 2015

52 pages

Published in:

Int.J.Mod.Phys.D 24 (2015) 06, 1530018

Published: Mar 31, 2015

e-Print:

1502.05474 [gr-qc]

DOI:

10.1142/S0218271815300189

View in:

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Abstract: (WSP)

Pulsars are wonderful gravitational probes. Their tiny size and stellar mass give their rotation periods a stability comparable to that of atomic frequency standards. This is especially true of the rapidly rotating "millisecond pulsars" (MSPs). Many of these rapidly rotating pulsars are in orbit with another star, allowing pulsar timing to probe relativistic perturbations to the orbital motion. Pulsars have provided the most stringent tests of theories of relativistic gravitation, especially in the strong-field regime, and have shown that Einstein's general theory of relativity is an accurate description of the observed motions. Many other gravitational theories are effectively ruled out or at least severely constrained by these results. MSPs can also be used to form a "Pulsar Timing Array" (PTA). PTAs are Galactic-scale interferometers that have the potential to directly detect nanohertz gravitational waves from astrophysical sources. Orbiting super-massive black holes in the cores of distant galaxies are the sources most likely to be detectable. Although no evidence for gravitational waves has yet been found in PTA data sets, the latest limits are seriously constraining current ideas on galaxy and black-hole evolution in the early universe.

Note:

55 pages, 24 figures. Published in International Journal of Modern Physics D and accepted for "One Hundred Years of General Relativity: from Genesis and Empirical Foundations to Gravitational Waves, Cosmology and Quantum Gravity", to be published by World Scientific Publishing Company

Gravity
gravitational waves
pulsars
pulsar timing
general relativity
pulsar: rotation
gravitation: relativistic
gravitational radiation
gravitational radiation detector
gravitational radiation: emission

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