43 research outputs found
Zero-brane approach to quantization of biscalar field theory about topological kink-bell solution
We study the properties of the topologically nontrivial doublet solution
arisen in the biscalar theory with a fourth-power potential introducing an
example of the spontaneous breaking of symmetry. We rule out the zero-brane
(non-minimal point particle) action for this doublet as a particle with
curvature. When quantizing it as the theory with higher derivatives, we
calculate the quantum corrections to the mass of the doublet which could not be
obtained by means of the perturbation theory.Comment: some references were adde
Path integral quantization of scalar fluctuations above a kink
We quantize scalar fluctuations in 1+1 dimensions above a classical
background kink. The properties of the effective action for the corresponding
classical field are studied with an exact functional method, alternative to
exact Wilsonian renormalization, where the running parameter is a bare mass,
and the regulator of the quantum theory is fixed. We extend this approach, in
an appendix, to a Yukawa interaction in higher dimension.Comment: Comments adde
Classical and quantum evolution of non-isentropic hot singular layers in finite-temperature general relativity
The spherically symmetric layer of matter is considered within the frameworks
of general relativity. We perform generalization of the already known theory
for the case of nonconstant surface entropy and finite temperature. We also
propose the minisuperspace model to determine the behaviour of temperature
field and perform the Wheeler-DeWitt quantization.Comment: final version, published in GRG as a lette
Mass of perfect fluid black shells
The spherically symmetric singular perfect fluid shells are considered for
the case of their radii being equal to the event horizon (the black shells). We
study their observable masses, depending at least on the three parameters,
viz., the square speed of sound in the shell, instantaneous radial velocity of
the shell at a moment when it reaches the horizon, and integration constant
related to surface mass density. We discuss the features of black shells
depending on an equation of state.Comment: 1 figure, LaTeX; final version + FA
Radiation fluid singular hypersurfaces with de Sitter interior as models of charged extended particles in general relativity
In present paper we construct the classical and minisuperspace quantum models
of an extended charged particle. The modelling is based on the radiation fluid
singular hypersurface filled with physical vacuum. We demonstrate that both at
classical and quantum levels such a model can have equilibrium states at the
radius equal to the classical radius of a charged particle. In the cosmological
context the model could be considered also as the primary stationary state,
having the huge internal energy being nonobservable for an external observer,
from which the Universe was born by virtue of the quantum tunnelling.Comment: LaTeX (IOPP style); final versio
Evolution of thin-wall configurations of texture matter
We consider the free matter of global textures within the framework of the
perfect fluid approximation in general relativity. We examine thermodynamical
properties of texture matter in comparison with radiation fluid and bubble
matter. Then we study dynamics of thin-wall selfgravitating texture objects,
and show that classical motion can be elliptical (finite), parabolical or
hyperbolical. It is shown that total gravitational mass of neutral textures in
equilibrium equals to zero as was expected. Finally, we perform the
Wheeler-DeWitt's minisuperspace quantization of the theory, obtain exact wave
functions and discrete spectra of bound states with provision for spatial
topology.Comment: intermediate research on nature of dual-radiation matter; LaTeX, 12
pages, 1 figure and epsfig style file included; slightly shortened version
was published in December issue of GR
Singularity-free model of electric charge in physical vacuum: Non-zero spatial extent and mass generation
We propose a model of a spinless electrical charge as a self-consistent field
configuration of the electromagnetic (EM) field interacting with a physical
vacuum effectively described by the logarithmic quantum Bose liquid. We show
that, in contrast to the EM field propagating in a trivial vacuum, a regular
solution does exist, and both its mass and spatial extent emerge naturally from
dynamics. It is demonstrated that the charge and energy density distribution
acquire Gaussian-like form. The solution in the logarithmic model is stable and
energetically favourable, unlike that obtained in a model with a quartic
(Higgs-like) potential.Comment: 10 pages, 9 figures, final/published versio