14,774 research outputs found
General Static Axially-symmetric Solutions of (2+1)-dimensional Einstein-Maxwell-Dilaton Theory
We obtain the general static solutions of the axially symmetric
(2+1)-dimensional Einstein-Maxwell-Dilaton theory by dimensionally reducing it
to a 2-dimensional dilaton gravity theory. The solutions consist of the
magnetically charged sector and the electrically charged sector. We illuminate
the relationship between the two sectors by pointing out the transformations
between them.Comment: 16 pages, revtex, a version to appear in Journal of Mathematical
Physic
Determination of from the polarization of vector meson in the semileptonic decay of and meson
Since the degree of polarization of the vector particle in semileptonic decay
strongly influences the decay width of the particles, it can be used as a
measure of CKM matrix elements. We show that |V_{cb}| can be determined from
the measurement of polarization of vector meson in B,B_c --> V l nu decay,
where is vector meson.Comment: 11 pages, RevTe
Is Lavelle-McMullan transformation a really new symmetry in QED?
Lavelle-McMullan symmetry of QED is examined at classical and quantum levels.
It is shown that Lavelle-McMullan symmetry does not give any new non-trivial
information in QED by examining the Ward-Takahashi identities. Being inspired
by the examination of Ward-Takahashi identity, we construct the generalized
non-local and non-covariant symmetries of QED.Comment: LATEX, 9 pages, two figures generated by Feynma
The Empirical Relationship Between Exchange Rates and Interest Rates in Post-Crisis Asia
In post-crisis Asia, all crisis-hit countries (except Malaysia) announced a shift from exchange rate based monetary policy framework to the explicit adoption of inflation targeting that uses interest rates as the key monetary policy operating instrument. In this study, we examine the empirical relationship between exchange rates and interest rates, and investigate how the dynamics between them have changed following the crisis. This is carried out by constructing a bivariate VAR-GARCH model for each of the four Asian crisis countries, namely Indonesia, Korea, Philippines and Thailand. The findings suggest these countries do not use interest rate policy more actively to stabilize exchange rates after the crisis, and provide evidence that their domestic currencies exhibit greater sensitivity to competitors’ exchange rates post-crisis. Further, the results indicate that increased exchange rate flexibility has not led to greater stability in interest rates in these economies.Exchange rate, interest rate, bivariate VAR-GARCH model, causation in volatilities
Form Factors for Exclusive Semileptonic --Decays
We developed the new parton model approach for exclusive semileptonic decays
of -meson to by extending the inclusive parton model, and by
combining with the results of the HQET, motivated by Drell-Yan process. Without
the nearest pole dominance ans\"atze, we {\bf derived} the dependences of
hadronic form factors on . We also calculated numerically the slope of the
Isgur-Wise function, which is consistent with the experimental results.Comment: 20 pages, RevTex, 2 ps figure files(uuencoded in seperate file
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