16,995 research outputs found
Finite temperature holographic duals of 2-dimensional BCFTs
We consider holographic duals of -dimensional conformal field theories in
the presence of a boundary, interface, defect and/or junction, referred to
collectively as BCFTs. In general, the presence of a boundary reduces the
conformal symmetry to and the dual geometry is realized as
a warped product of the form , where is not
compact. In particular, it will contain points where the warp factor of the
space diverges, leading to asymptotically regions. We show that
the space-time may always be replaced with an -"black-hole"
space-time. We argue the resulting geometry describes the BCFT at finite
temperature. To motivate this claim, we compute the entanglement entropy
holographically for a segment centered around the defect or ending on the
boundary and find agreement with a known universal formula.Comment: 16 pages, 2 figures; minor corrections and references adde
Rocket nozzle test method Patent
Method for testing rocket nozzles at high tensile stress level
Stress-testing of the throat of a rocket's nozzle
Test motor in which high initial pressure can be reduced suddenly provides a method of testing stress effects in the throat of a rockets nozzle. Motors operating pressure is increased to aggravate tensile stresses in a submerged throat. Opposing compression stresses are limited by control of the operating pressure
Thematic relations affect similarity via commonalities
Thematic relations are an important source of perceived similarity. For instance, the rowing theme of boats and oars increases their perceived similarity. The mechanism of this effect, however, has not been specified previously. We investigated whether thematic relations affect similarity by increasing commonalities or by decreasing differences. In Experiment 1, thematic relations affected similarity more than difference, thereby producing a non-inversion of similarity and difference. Experiment 2 revealed substantial individual variability in the preference for thematic relations and, consequently in the non-inversion of ratings. In sum, the experiments demonstrated a non-inversion of similarity and difference that was caused by thematic relations and exhibited primarily by a subgroup of participants. These results indicate that thematic relations affect perceived similarity by increasing the contribution of commonalities rather than by decreasing the contribution of differences
Integrable systems from supergravity BPS equations
Integrable systems of the sine-Gordon/Liouville type, which arise from
reducing the BPS equations for solutions invariant under 16 supersymmetries in
Type IIB supergravity and M-theory, are shown to be special cases of an
infinite family of integrable systems, parametrized by an arbitrary real
function of a real variable. It is shown that, for each function , this
generalized integrable system may be mapped onto a system of linear equations,
which in turn may be integrated in terms of the two linearly independent
solutions of an ordinary linear second order differential equation which
depends only on the function .Comment: 7 page
Land use investigations in the central valley and central coastal test sites, California
The Geography Remote Sensing Unit (GRSU) at the University of California, Santa Barbara is responsible for investigations with ERTS-1 data in the Central Coastal Zone and West Side of the San Joaquin Valley. The nature of investigative effort involves the inventory, monitoring, and assessment of the natural and cultural resources of the two areas. Land use, agriculture, vegetation, landforms, geology, and hydrology are the principal subjects for attention. These parameters are the key indicators of the dynamically changing character of the areas. Monitoring of these parameters with ERTS-1 data will provide the techniques and methodologies required to generate the information needed by federal, state, county, and local agencies to assess change-related phenomena and plan for management and development
Investigation of plasma contactors for use with orbiting wires
The results of a number of orbital simulations for a 300km orbital height and 28 degrees orbital inclination are included to emphasize the importance of the choice of the timing of the experiments. The bulk of the effort has gone into trying to determine the shape, size, and other optical properties of the plasma clouds that will be emitted by the hollow cathodes
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