Why Old Pulsars Do Not Glitch Often

Some pulsars are stable in the universe, even though, many of them glitch i.e. theirrnspin frequencies increase suddenly. Young pulsars, such as the crab pulsar glitch withinrnshort period of time i.e. they glitch within a few years. However, old pulsars do notrnglitch as such. This thesis tries to analyze the causes behind these glitches and whyrntheir frequencies decrease with the ages of pulsars. We study the gravitational tidalrnforce interaction between the core and the crust and employs its e ect on the long termrnevolution of pulsar glitches. In particular, we have shown that old pulsars show lessrnglitches proportional to their ages and also we derived the time at which the crust andrnthe core of neutron star will be tidally locked.rnKey Words: star: neutron star, pulsars: general, glitch: pulsar , tidal interaction

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