39 research outputs found
Topologically Massive Gravity and the AdS/CFT Correspondence
We set up the AdS/CFT correspondence for topologically massive gravity (TMG)
in three dimensions. The first step in this procedure is to determine the
appropriate fall off conditions at infinity. These cannot be fixed a priori as
they depend on the bulk theory under consideration and are derived by solving
asymptotically the non-linear field equations. We discuss in detail the
asymptotic structure of the field equations for TMG, showing that it contains
leading and subleading logarithms, determine the map between bulk fields and
CFT operators, obtain the appropriate counterterms needed for holographic
renormalization and compute holographically one- and two-point functions at and
away from the 'chiral point' (mu = 1). The 2-point functions at the chiral
point are those of a logarithmic CFT (LCFT) with c_L = 0, c_R = 3l/G_N and b =
-3l/G_N, where b is a parameter characterizing different c = 0 LCFTs. The bulk
correlators away from the chiral point (mu \neq 1) smoothly limit to the LCFT
ones as mu \to 1. Away from the chiral point, the CFT contains a state of
negative norm and the expectation value of the energy momentum tensor in that
state is also negative, reflecting a corresponding bulk instability due to
negative energy modes.Comment: 54 pages, v2: added comments and reference
From D-Dbar Pairs to Branes in Motion
We investigate various supersymmetric brane intersections. Motivated by the
recent results on supertubes, we investigate general constraints in which
parallel brane-antibrane configurations are supersymmetric. Dual descriptions
of these configurations involve systems of branes in relative motion. In
particular, we find new supersymmetric configurations which are not related to
a static brane intersection by a boost. In these new configurations, the
intersection point moves at the speed of light. These systems provide
interesting time dependent backgrounds for open strings.Comment: 28+1 pages, 8 figures, uses JHEP3.cl
Innovative Monoclonal Antibody Therapies in Multiple Sclerosis
The recent years have witnessed great efforts in establishing new therapeutic
options for multiple sclerosis (MS), especially for
relapsing–remitting disease courses. In particular, the application
of monoclonal antibodies provide innovative approaches allowing for blocking or
depleting specific molecular targets, which are of interest in the pathogenesis
of MS. While natalizumab received approval by the US Food and Drug
Administration and the European Medicines Agency in 2006 as the first monoclonal
antibody in MS therapy, rituximab, alemtuzumab, and daclizumab were successfully
tested for relapsing-remitting MS in small cohorts in the meantime. Here, we
review the data available from these recent phase II trials and at the same time
critically discuss possible pitfalls which may be relevant for clinical
practice. The results of these studies may not only broaden our therapeutic
options in the near future, but also provide new insights into disease
pathogenesis