Effects of oscillating spacetime metric background on a complex scalar field and formation of topological vortices. (arXiv:1911.13216v4 [hep-th] UPDATED)
<a href="http://arxiv.org/find/hep-th/1/au:+Dave_S/0/1/0/all/0/1">Shreyansh S. Dave</a>, <a href="http://arxiv.org/find/hep-th/1/au:+Digal_S/0/1/0/all/0/1">Sanatan Digal</a>

We study the time evolution of a complex scalar field in the symmetry broken
phase in the presence of oscillating spacetime metric background. In our
(2+1)-dimensional simulations, we show that the spacetime oscillations can
excite an initial field configuration, which ultimately leads to the formation
of topological vortices in the system. At late times, field configuration
achieves a disordered state. A detailed study of the momentum and frequency
modes of the field reveals that these field excitations are driven by the
phenomena of parametric resonance. In extremely high frequency regime where
frequency of spacetime oscillations is much larger than the field-mass, the
formed vortices are not topological in nature. Interestingly in this regime,
for a suitable choice of parameters of the simulation, we observe a persistent
lattice structure of vortex-antivortex pairs. We discuss applications of our
study to the dynamics of interior superfluidity of neutron stars during binary
neutron star mergers, in generation of excitation in ultralight axion-like
field near a strong gravitational wave source, etc.

We study the time evolution of a complex scalar field in the symmetry broken
phase in the presence of oscillating spacetime metric background. In our
(2+1)-dimensional simulations, we show that the spacetime oscillations can
excite an initial field configuration, which ultimately leads to the formation
of topological vortices in the system. At late times, field configuration
achieves a disordered state. A detailed study of the momentum and frequency
modes of the field reveals that these field excitations are driven by the
phenomena of parametric resonance. In extremely high frequency regime where
frequency of spacetime oscillations is much larger than the field-mass, the
formed vortices are not topological in nature. Interestingly in this regime,
for a suitable choice of parameters of the simulation, we observe a persistent
lattice structure of vortex-antivortex pairs. We discuss applications of our
study to the dynamics of interior superfluidity of neutron stars during binary
neutron star mergers, in generation of excitation in ultralight axion-like
field near a strong gravitational wave source, etc.

http://arxiv.org/icons/sfx.gif