| Name: | Vivek Baruah Thapa |
| Affiliation: | Bhawanipur Anchalik College, Barpeta, Assam |
| Conference ID : | ASI2024_298 |
| Title : | Contribution of neutron star core superfluidity in pulsar glitches |
| Authors : | Vivek Baruah Thapa1,2, Monika Sinha2, Rana Nandi3, Debades Bandopadhyay4 |
| Authors Affiliation: | 1 Vivek Baruah Thapa (Bhawanipur Anchalik College, Barpeta, Assam-781352, India)
2 Vivek Baruah Thapa, Monika Sinha (Indian Institute of Technology Jodhpur, Jodhpur-342037, India)
3 Rana Nandi (Shiv Nadar University, Delhi NCR-201314, India)
4 Debades Bandopadhyay (Saha Institute of Nuclear Physics, 1/AF Bidhannagar, Calcutta-700 064, India) |
| Mode of Presentation: | Poster |
| Abstract Category : | High Energy Phenomena, Fundamental Physics and Astronomy |
| Abstract : | Many pulsars are found to exhibit a peculiar behaviour of sudden increases in the observed rotational velocity (Ω) (glitch). Some of the pulsars are observed to produce giant glitches relative amplitude ∆Ω/Ω ∼ 10−6 − 10−5. In this work, we model the glitch phenomenon taking into account the crust as well as core superfluid contributions. The matter composition in the neutron star interior is considered to be made of nucleons, antikaons and leptons. Furthermore, a first order phase transition from the nuclear matter to the Bose-Einstein condensed matter of antikaons is adopted in this calculation. This investigation is carried out in the relativistic mean model with the GMT parametrization resulting in a stiff equation of state that satisfies the constrain of 2 solar mass neutron stars including the antikaon condensate. The crystalline structures of the mixed phase of the nuclear matter and the antikaon condensed matter act as pinning sites for superfluid vortices in the core. This provides an extra reservoir for angular momentum. The pinning force in the core is found to be a few orders of magnitude lower than that in the crust. The angular momentum transfer due to the unpinning of neutron superfluid vortices in the mixed phase is less than 1% of that of the inner crust. |
