1,245 research outputs found
Mass inflation and chaotic behaviour inside hairy black holes
We analyze the interior geometry of static, spherically symmetric black holes
of the Einstein-Yang-Mills-Higgs theory. Generically the solutions exhibit a
behaviour that may be described as ``mass inflation'', although with a
remarkable difference between the cases with and without a Higgs field. Without
Higgs field the YM field induces a kind of cyclic behaviour leading to repeated
cycles of mass inflation - taking the form of violent explosions - interrupted
by quiescent periods and subsequent approaches to an almost Cauchy horizon.
With the Higgs field no such cycles occur. In addition there are non-generic
families with a Schwarzschild resp. Reissner-Nordstr{\o}m type singularity at
r=0.Comment: 22 pages, Latex, 5 figures (8 eps files
Gravitating Yang-Mills vortices in 4+1 spacetime dimensions
The coupling to gravity in D=5 spacetime dimensions is considered for the
particle-like and vortex-type solutions obtained by uplifting the D=4
Yang-Mills instantons and D=3 Yang-Mills-Higgs monopoles. It turns out that the
particles become completely destroyed by gravity, while the vortices admit a
rich spectrum of gravitating generalizations. Such vortex defects may be
interesting in view of the AdS/CFT correspondence or in the context of the
brane world scenario.Comment: 1 figure and 1 formula added; to appear in PL
NLO corrections to the polarized Drell-Yan cross section in proton-proton collisions
We present the full next-to-leading order (NLO) corrected inclusive cross
section for massive lepton pair production in longitudinally polarized
proton-proton collisions. All QCD partonic subprocesses have been included
provided the lepton pair is created by a virtual photon, which is a valid
approximation for . Like in unpolarized proton-proton
scattering the dominant subprocess is given by the -channel so that
massive lepton pair production provides us with an excellent method to measure
the spin density of the gluon. Using our calculations we give predictions for
the longitudinal spin asymmetry measurements at the RHIC.Comment: 4 pages, LaTeX, 2 Postscript figures. Talk presented at the 6th
International Symposium on Radiative Corrections "RADCOR 2002" and 6th
Zeuthen Workshop on Elementary Particle Theory. Kloster Banz, Germany,
September 8-13, 200
On Nonlinear -Models arizing in (Super-)Gravity
In a previous paper with Gibbons [CMP 120 (1987) 295] we derived a list of
three dimensional symmetric space -model obtained by dimensional
reduction of a class of four dimensional gravity theories with abelian gauge
fields and scalars. Here we give a detailed analysis of their group theoretical
structure leading to an abstract parametrization in terms of `triangular' group
elements. This allows for a uniform treatment of all these models. As an
interesting application we give a simple derivation of a `Quadratic Mass
Formula' for strictly stationary black holes.Comment: 33 pages, 1 tabl
Gravitating Monopole Solutions II
We present analytical and numerical results for static, spherically symmetric
solutions of the Einstein Yang-Mills Higgs equations corresponding to magnetic
monopoles and non-abelian magnetically charged black holes. In the limit of
infinite Higgs mass we give an existence proof for these solutions. The
stability of the abelian extremal Reissner-Nordstrom black holes is reanalyzed.Comment: 24 pages, 11 figures (uuencoded compressed tar
Quantization of the Reissner-Nordstr\"{o}m Black Hole
The Reissner--Nordstr\"{o}m family of solutions can be understood to arise
from the spherically symmetric sector of a nonlinear SO(2,1)/SO(1,1) sigma
model coupled to three dimensional Euclidean gravity. In this context a group
theoretical quantization is performed. We identify the observables of the
theory and calculate their spectra.Comment: 8 pages, Late
Gravitating monopoles and black holes in Einstein-Born-Infeld-Higgs model
We find static spherically symmetric monopoles in Einstein-Born-Infeld-Higgs
model in 3+1 dimensions. The solutions exist only when a parameter \a
(related to the strength of Gravitational interaction) does not exceed certain
critical value. We also discuss magnetically charged non Abelian black holes in
this model. We analyse these solutions numerically.Comment: LaTex,10 pages, 5figure
A practical gauge invariant regularization of the SO(10) grand unified model
It is shown that a simple modification of the dimensional regularization
allows to compute in a consistent and gauge invariant way any diagram with less
than four loops in the SO(10) unified model. The method applies also to the
Standard Model generated by the symmetry breaking . A gauge invariant regularization for arbitrary diagram is
also described.Comment: 10 pages, uses linedraw.st
On The Dimensional Methods in Rare b Decays
Since several years there exists a question whether the dimensional reduction
and the usual dimensional regularization give different results for the
QCD-improved and decay
rates. Here it is demonstrated explicitly that this is not the case: As long as
physically meaningful quantities are considered, the results obtained with help
of both techniques agree.Comment: 14 pages (including 1 page figures
Correlation functions of boundary field theory from bulk Green's functions and phases in the boundary theory
In the context of the bulk-boundary correspondence we study the correlation
functions arising on a boundary for different types of boundary conditions. The
most general condition is the mixed one interpolating between the Neumann and
Dirichlet conditions. We obtain the general expressions for the correlators on
a boundary in terms of Green's function in the bulk for the Dirichlet, Neumann
and mixed boundary conditions and establish the relations between the
correlation functions. As an instructive example we explicitly obtain the
boundary correlators corresponding to the mixed condition on a plane boundary
of a domain in flat space . The phases of the boundary theory
with correlators of the Neumann and Dirichlet types are determined. The
boundary correlation functions on sphere are calculated for the Dirichlet
and Neumann conditions in two important cases: when sphere is a boundary of a
domain in flat space and when it is a boundary at infinity of Anti-De
Sitter space . For massless in the bulk theory the Neumann
correlator on the boundary of AdS space is shown to have universal logarithmic
behavior in all AdS spaces. In the massive case it is found to be finite at the
coinciding points. We argue that the Neumann correlator may have a dual
two-dimensional description. The structure of the correlators obtained, their
conformal nature and some recurrent relations are analyzed. We identify the
Dirichlet and Neumann phases living on the boundary of AdS space and discuss
their evolution when the location of the boundary changes from infinity to the
center of the AdS space.Comment: 32 pages, latex, no figure
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