25 research outputs found
New Charged Dilaton Solutions in 2+1 Dimensions and Solutions with Cylindrical Symmetry in 3+1 Dimensions
We report a new family of solutions to Einstein-Maxwell-dilaton gravity in
2+1 dimensions and Einstein-Maxwell gravity with cylindrical symmetry in 3+1
dimensions. A set of static charged solutions in 2+1 dimensions are obtained by
a compactification of charged solutions in 3+1 dimensions with cylindrical
symmetry. These solutions contain naked singularities for certain values of the
parameters considered. New rotating charged solutions in 2+1 dimensions and 3+1
dimensions are generated treating the static charged solutions as seed metrics
and performing transformations.Comment: Latex. No figure
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HYDROCARBONS OF BIOLOGICAL ORIGIN FROM A ONE-BILLION YEAR OLDSEDIMENT
The isoprenoid hydrocarbons, phytane (C{sub 20}H{sub 42}) and pristane (C{sub 19}H{sub 40}) are present in the oil seeping from the Pre-Cambrian Nonesuch Formation at the White Pine Mine, Michigan. Gas-liquid chromatography and mass spectrometry provide the isolation and identification procedures
A unified Witten-Reshetikhin-Turaev invariant for integral homology spheres
We construct an invariant J_M of integral homology spheres M with values in a
completion \hat{Z[q]} of the polynomial ring Z[q] such that the evaluation at
each root of unity \zeta gives the the SU(2) Witten-Reshetikhin-Turaev
invariant \tau_\zeta(M) of M at \zeta. Thus J_M unifies all the SU(2)
Witten-Reshetikhin-Turaev invariants of M. As a consequence, \tau_\zeta(M) is
an algebraic integer. Moreover, it follows that \tau_\zeta(M) as a function on
\zeta behaves like an ``analytic function'' defined on the set of roots of
unity. That is, the \tau_\zeta(M) for all roots of unity are determined by a
"Taylor expansion" at any root of unity, and also by the values at infinitely
many roots of unity of prime power orders. In particular, \tau_\zeta(M) for all
roots of unity are determined by the Ohtsuki series, which can be regarded as
the Taylor expansion at q=1.Comment: 66 pages, 8 figure
Quotients of AdS_{p+1} x S^q: causally well-behaved spaces and black holes
Starting from the recent classification of quotients of Freund--Rubin
backgrounds in string theory of the type AdS_{p+1} x S^q by one-parameter
subgroups of isometries, we investigate the physical interpretation of the
associated quotients by discrete cyclic subgroups. We establish which quotients
have well-behaved causal structures, and of those containing closed timelike
curves, which have interpretations as black holes. We explain the relation to
previous investigations of quotients of asymptotically flat spacetimes and
plane waves, of black holes in AdS and of Godel-type universes.Comment: 48 pages; v2: minor typos correcte
Plane-symmetric inhomogeneous magnetized viscous fluid universe with a variable
The behavior of magnetic field in plane symmetric inhomogeneous cosmological
models for bulk viscous distribution is investigated. The coefficient of bulk
viscosity is assumed to be a power function of mass density . The values of cosmological constant for these models are
found to be small and positive which are supported by the results from recent
supernovae Ia observations. Some physical and geometric aspects of the models
are also discussed.Comment: 18 pages, LaTex, no figur
Impact of CP phases on the search for sleptons tau and nu_tau
We study the decays of the tau-sleptons (stau_{1,2}) and tau-sneutrino
(snu_tau) in the Minimal Supersymmetric Standard Model (MSSM) with complex
parameters A_tau, mu and M_1 (U(1) gaugino mass). We show that the effect of
the CP phases of these parameters on the branching ratios of stau_{1,2} and
snu_tau decays can be quite strong in a large region of the MSSM parameter
space. This could have an important impact on the search for stau_{1,2} and
snu_tau and the determination of the MSSM parameters at future colliders.Comment: 15 pages, 5 figures, LaTeX2
Global Boundary Stratotype Section and Point (GSSP) for the Anthropocene Series: Where and how to look for potential candidates
International audienc
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HYDROCARBONS OF BIOLOGICAL ORIGIN FROM A ONE-BILLION YEAR OLD SEDIMENT
Fabrication of a microfluidic chip for PCR applications
The fabrication of a microfluidic chip for application to polymerase chain (PCR) is presented. In this chip, a micro peristaltic pump was integrated to pump a reactant droplet. PCR reaction chambers, Pt heaters, temperature sensors, and pn-diodes were fabricated on a silicon wafer. Access holes for fluid and electrical connections, and pump membranes were etched in a Pyrex wafer, which was anodically bonded onto the silicon. Three PZT discs were glued on pump membranes to actuate the micro peristaltic pump