986 research outputs found
Matrix String Theory from Brane Configuration
Configurations of fivebranes, twobranes and fourbranes in type IIA string
theory, which give (1+1) dimensional supersymmetric gauge theories in the low
energy limit, are constructed. It is shown that these brane configurations are
equivalent to a certain class of matrix string theories. This opens up an
avenue for the investigation of matrix string dynamics via the geometry of the
brane configurations in type IIA string theory.Comment: 14 pages, 7 figures, LaTeX, the discussion of mirror symmetry added,
some typos corrected, to appear in Phys. Lett.
Seiberg's Duality from Monodromy of Conifold Singularity
Duality between N=1 supersymmetric gauge theories(Seiberg's duality) is
geometrized, in the framework of AdS/CFT correspodences. It is shown that
Seiberg's duality corresponds to monodromy of wrapped D5 branes on the homology
cycles of a generalized conifold where D3 branes are located. The celebrated
\tilde{N}_c=N_f-N_c, \tilde{N}_f=N_f rule is reproduced and a braid group
structure in a sequence of dualities, is found.Comment: 11 pages, LaTe
Cartan subalgebras of C*-algebras associated with complex dynamical systems
Let be a rational function with degree and be its Julia set,
its Fatou set, or the Riemann sphere. Suppose that is not empty. We can
regard as a continuous map from onto itself. Kajiwara and Watatani
showed that in the case that is the Julia set, is a maximal
abelian subalgebra of , where denotes the
C*-algebra associated with the dynamical system introduced by them. In
this paper, we develop their result and give the equivalent condition for
to be a Cartan subalgebra of .Comment: 26 page
Technical and Organizational Considerations for the Long-Term Maintenance and Development of Digital Brain Atlases and Web-Based Databases
Digital brain atlas is a kind of image database that specifically provide information about neurons and glial cells in the brain. It has various advantages that are unmatched by conventional paper-based atlases. Such advantages, however, may become disadvantages if appropriate cares are not taken. Because digital atlases can provide unlimited amount of data, they should be designed to minimize redundancy and keep consistency of the records that may be added incrementally by different staffs. The fact that digital atlases can easily be revised necessitates a system to assure that users can access previous versions that might have been cited in papers at a particular period. To inherit our knowledge to our descendants, such databases should be maintained for a very long period, well over 100 years, like printed books and papers. Technical and organizational measures to enable long-term archive should be considered seriously. Compared to the initial development of the database, subsequent efforts to increase the quality and quantity of its contents are not regarded highly, because such tasks do not materialize in the form of publications. This fact strongly discourages continuous expansion of, and external contributions to, the digital atlases after its initial launch. To solve these problems, the role of the biocurators is vital. Appreciation of the scientific achievements of the people who do not write papers, and establishment of the secure academic career path for them, are indispensable for recruiting talents for this very important job
Acute Genetic Manipulation of Neuronal Activity for the Functional Dissection of Neural Circuits â A Dream Come True for the Pioneers of Behavioral Genetics
This review summarizes technical development of the functional manipulation of specific neural circuits through genetic techniques in Drosophila. Long after pioneers â efforts for the genetic dissection of behavior using this organism as a model, analyses with acute activation of specific neural circuits have finally become feasible using transgenic Drosophila that expresses light-, heat-, or cold-activatable cation channels by xxx/upstream activation sequence (Gal4/UAS)-based induction system. This methodology opened a new avenue to dissect functions of neural circuits to make dreams of the pioneers into reality
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