Astronomy and Astrophysics – Astrophysics – General Relativity and Quantum Cosmology
Scientific paper
2001-04-09
Astronomy and Astrophysics
Astrophysics
General Relativity and Quantum Cosmology
3 pages no figures
Scientific paper
Gravitational redshifts of neutron stars have a theoretical upper limit of z=0.62. Also, it is generally believed that neutron stars have magnetic fields on the order of ten to the twelfth to ten to the thirteenth G. A previously predicted electromagnetic time dilation effect has been shown to correctly predict decay lifetimes of muons bound to atomic nuclei. In this paper it is shown that the electromagnetic time dilation effect, along with the gravitational time dilation effect, can produce total neutron star redshifts that are substantially larger than 0.62. For instance, the redshift can cutoff radiation for B on the order of ten to the thirteenth G. Consequently, we can have a neutron star that is unobservable except for localized surface regions where the cutoff condition does not hold. Assuming coherent radiation, a surface region of this kind that does not include the star's rotation axis will emit a lighthouse type beam. Since the magnetic field in these regions will usually be strong enough to cause significant redshifts, and there is no reason to expect these regions to always be of constant size, shape, or field strength, this model explains the predominance of radio waves, and the existence of pulse variations, (e.g. nulling and drifting) in pulsars.
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