18-22 September 2017
Yerevan, Armenia
Etc/GMT+4 timezone

Magnetic field generation in hybrid neutron stars

22 Sep 2017, 09:40
40m
Yerevan, Armenia

Yerevan, Armenia

Department of Physics, Alex Manoogian str. 1, Yerevan, Armenia

Speaker

Prof. David Sedrakian (Yerevan State University)

Description

The mechanism of magnetic field generation in hybrid neutron stars (consisting of “npe”
hadronic, “2SC” and “CFL” quark phases) is considered. We assume that rotational vortices in “npe”
and “CFL” phases with quantum of circulation 𝜋ℏ/𝑚 are continued in “2SC” phase as well. Since
superconducting matter in “npe” and “2SC” phases is charged, rotation induced entrainment currents
arise around vortices, which generate magnetic field. Mean value of generated magnetic field is about
1016Gs and exceeds one in “npe” phase by 3-4 orders of magnitude. The magnetic field enters the
vicicnity of rotational vortices forming the clusters of magnetic vortices with quantum of magnetic
flux Φ0 in “npe” phase and 2Φ0 in “2SC” phase. The radii of clusters are 0.1𝑏 and0.3𝑏, respectively,
in “npe” and “2SC” phases, where 𝑏 is a radius of rotational vortex. Magnetic field penetrates in “CFL”
phase via magnteic vortices with magnetic flux2Φ0. In “npe” phase this magnetic field can destroy
proton superconductivity. Magnetic field on the surface of a star reaches the value of 10
15Gs, which is
comparable with magnetic field of magnetars. Therefore magnetars are candidates of compact objects
containing quark matter.
Due to high density of magnetic energy of vortices, vortex-free zone appears at the bound of
“2SC” phase with width about several hundred meters. An outward motion of vortices during spindown
of a star leads to energy release when vortices reach to the boundary of vortex-free zone.
Magnetic energy of annihilated vortices may become the source of high-frequency radiation of
objects like SGR and AXP.

Type of contribution Invited talk

Primary authors

Prof. David Sedrakian (Yerevan State University) Dr Mekhak Hayrapetyan (Yerevan State University) Dr Daniel Baghdasaryan (Byurakan Astrophysical Observatory)

Presentation Materials