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 ∣Vcb∣|V_{cb}| from the polarization of vector meson in the semileptonic decay of BB and BcB_c 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 $V$ 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 BB--Decays

We developed the new parton model approach for exclusive semileptonic decays of $B$-meson to $D,~D^*$ 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 $q^2$. 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