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Crustal torsional oscillations inside the deeper pasta structures
Author(s) -
Sotani Hajime
Publication year - 2019
Publication title -
astronomische nachrichten
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.394
H-Index - 63
eISSN - 1521-3994
pISSN - 0004-6337
DOI - 10.1002/asna.201913705
Subject(s) - neutron star , physics , quasiperiodic function , astrophysics , pulsar , excited state , phase (matter) , symmetry (geometry) , neutron , atomic physics , condensed matter physics , nuclear physics , geometry , quantum mechanics , mathematics
The quasiperiodic oscillations (QPOs) have been discovered in the afterglow of the giant flares observed in the soft‐gamma repeaters. As QPOs are strongly associated with the neutron star oscillations, one could extract the neutron star properties via identification of QPOs as specific neutron star oscillations. In this study, we take into account the torsional oscillations inside the phase composed of cylindrical holes (tubes) and spherical holes (bubbles), which correspond to the inner layer in the neutron star crust. We remark that such oscillations are independent of the oscillations inside the phase composed of spherical and cylindrical nuclei, which correspond to the outer layer. Then, we find that all the observed QPOs can be explained with torsional oscillations excited in either layer, which is consistent with the severe constraint on the slope parameter, L , of nuclear symmetry energy as L ≃ 58 − 73 MeV obtained in our previous study.