477 research outputs found
The 1-soliton in the SO(3) gauged Skyrme model with mass term
The solitons of the SO(3) gauged Skyrme model with no pion-mass potential
were studied in Refs. {nl,jmp}. Here, the effects of the inclusion of this
potential are studied. In contrast with the (ungauged) Skyrme model, where the
effect of this potential on the solitons is marginal, here it turns out to be
decisive, resulting in very different dependence of the energy as a function of
the Skyrme coupling constant.Comment: new title, typos corrected, LaTeX, 8 pages, 4 figure
Spherical Structures in Conformal Gravity and its Scalar-Tensor Extension
We study spherically-symmetric structures in Conformal Gravity and in a
scalar-tensor extension and gain some more insight about these gravitational
theories. In both cases we analyze solutions in two systems: perfect fluid
solutions and boson stars of a self-interacting complex scalar field. In the
purely tensorial (original) theory we find in a certain domain of parameter
space finite mass solutions with a linear gravitational potential but without a
Newtonian contribution. The scalar-tensor theory exhibits a very rich structure
of solutions whose main properties are discussed. Among them, solutions with a
finite radial extension, open solutions with a linear potential and logarithmic
modifications and also a (scalar-tensor) gravitational soliton. This may also
be viewed as a static self-gravitating boson star in purely tensorial Conformal
Gravity.Comment: 24 pages, revised version, accepted for publication in Phys. Rev.
Spherical Non-Abelian Solutions in Conformal Gravity
We study static spherically-symmetric solutions of non-Abelian gauge theory
coupled to Conformal Gravity. We find solutions for the self-gravitating pure
Yang-Mills case as well as monopole-like solutions of the Higgs system. The
former are localized enough to have finite mass and approach asymptotically the
vacuum geometry of Conformal Gravity, while the latter do not decay fast enough
to have analogous properties.Comment: 12 pages, revised version, accepted for publication in Phys. Rev.
SU(5) Gravitating Monopoles
Spherically symmetric solutions of the SU(5) Einstein-Yang-Mills-Higgs system
are constructed using the harmonic map ansatz \cite{IS}. This way the problem
reduces to solving a set of ordinary differential equations for the appropriate
profile functions.Comment: 12 pages, 3 Figure
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