What can the braking indices tell us about the nature of pulsars

@article{Yue2007WhatCT,
  title={What can the braking indices tell us about the nature of pulsars},
  author={Youling Yue and Ren-xin Xu and W. W. Zhu},
  journal={Advances in Space Research},
  year={2007},
  volume={40},
  pages={1491-1497}
}
Abstract As a result of observational difficulties, braking indices of only six rotation-powered pulsars are obtained with some certainty. All these values are remarkably smaller than the value ( n  = 3) expected for pure magnetodipole radiation model. Various models have been proposed to explain this phenomenon such as introducing additional torques by particle outflow or accretion disk, changes in inclination angle or magnetic field strength, and field-reconnection process in pulsar… Expand
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References

SHOWING 1-10 OF 42 REFERENCES
Why the braking indices of young pulsars are less than 3
In this letter we discuss two possible reasons which cause the observed braking indices n of young radio pulsars to be smaller than 3: (a) the evolving spin-down model of the magnetic field componentExpand
Implications of a Constant Observed Braking Index for Young Pulsars' Spin-down
The observed braking index nobs, which has been determined for a few young pulsars, has been found to differ from the expected value for a rotating magnetic dipole model. In addition, the observedExpand
Pulsar braking index: a test of emission models?
Pulsar braking torques due to magnetodipole radiation and the unipolar generator are considered, which results in a braking index n of less than 3 and could be employed to test the emission models.Expand
The braking indices in pulsar emission models
Using the method proposed in a previous paper, we calculate pulsar braking indices in the models with torque contributions from both inner and outer accelerating regions, assuming that theExpand
New phase-coherent measurements of pulsar braking indices
Abstract Pulsar braking indices offer insight into the physics that underlies pulsar spin-down. Only five braking indices have been measured via phase-coherent timing; all measured values are lessExpand
Very low braking index for the Vela pulsar
THE rotation rate of a pulsar is thought to decrease with time according to a simple power law, with a 'braking index' equal to 3 if rotational energy is lost through radiation from a dipolarExpand
Disk-assisted Spin-down of Young Radio Pulsars
We present a model for the spin-down of young radio pulsars in which the neutron star loses rotational energy not only by emitting magnetic dipole radiation but also by torquing a surrounding diskExpand
A Braking Index for the Young, High Magnetic Field, Rotation-Powered Pulsar in Kesteven 75
We present the first phase-coherent measurement of a braking index for the young, energetic rotation-powered pulsar PSR J1846-0258. This 324 ms pulsar is located at the center of the supernovaExpand
GLITCHES, TORQUE EVOLUTION AND THE DYNAMICS OF YOUNG PULSARS
The Crab pulsar has suffered in 1975 and 1989 two glitches in which the frequency did not relaxed to the extrapolated pre-glitch value but rather spun up showing long-term changes in the frequencyExpand
The role of reconnection in the pulsar magnetosphere
The present work is our first attempt to understand the role of reconnection in the pulsar magnetosphere. Our discussion is based on the observational inference that, as the pulsar spins down, theExpand
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