14541880
D-brane dynamics and creations of open and closed strings after recombination
Abstract A quantum-mechanical technique is used within the framework of U(2) super-Yang–Mills theory to investigate what happens in the process after recombination of two D p -branes at one angle. Two types of initial conditions are considered, one of which with p =4 is a candidate of inflation mechanism. It is observed that the branes' shapes come to have three extremes due to localization of tachyon condensation. Furthermore, open string pairs connecting the decaying D-branes are shown to be created; most part of the released energy is used to create them. It also strongly suggests that creation of closed strings happens afterward. Closed strings as gravitational radiation from the D-branes are also shown to be created. A few speculations are also given on implications of the above phenomena for an inflation model.
17323083
On M-9-branes and their dimensional reductions
Abstract The M-9-brane Wess-Zumino action is constructed, and by using it, consistency of the relation of p-branes for p ≥ 8, suggested on the basis of superalgebra, is discussed.
9039443
A QUANTUM ANALYSIS ON RECOMBINATION OF D-BRANES AND ITS IMPLICATIONS FOR AN INFLATION MODEL
A quantum-mechanical technique is used within the framework of U(2) super-Yang-Mills theory to investigate processes after recombination of two D-p-branes at one angle. Two types of initial conditions are considered, one of which with $p=4$ is a candidate of inflation mechanism. It is shown that the branes' shapes come to have three extremes due to localization of tachyon condensation. ``Pair-creations'' of open stings connecting the recombined branes is also observed. The appearance of closed strings is also discussed; the decaying branes are shown to radiate non-vanishing gravitational wave, which may be interpreted as evidence of closed string appearance. A few speculations are also given on implications of the above phenomena for an inflation model.
9070559
Various Supersymmetric Brane Configurations from Superalgebras in Many Types of M-Brane Backgrounds
We derive superalgebras in many types of supersymmetric M-brane backgrounds. The backgrounds examined here include the cases of the M-wave and the M-Kaluza-Klein monopole. On the basis of the obtained algebras, we deduce all the supersymmetric nonorthogonal intersections of the M-Kaluza-Klein monopole and the M-5-brane at angles, most of which were previously unexamined. In addition, we present a new worldvolume soliton on the M-5-brane in the M-5-brane background which is interpreted as a certain intersection of three M-5-branes. The soliton has 1/8 supersymmetry, which can easily be confirmed by using the superalgebra. tsato@icrr.u-tokyo.ac.jp
118668452
Neutrino-induced forward meson-production reactions in nucleon resonance region
As a first step toward developing a reaction model that enables a comprehensive description of neutrino-nucleon reactions in the nucleon resonance region, we have applied for the first time a dynamical coupled-channels model, which successfully describes \pi N, \gamma N --> \pi N, \eta N, \pi \pi N, K\Lambda, K\Sigma reactions up to W = 2 GeV, to predict the neutrino-induced meson-production reactions with \Delta S = 0 at the forward angle limit. This has been achieved by relating the divergence of the axial-current matrix elements at Q^2 = 0 to the \pi N --> X reaction amplitudes through the PCAC hypothesis. We present the contributions from each of the \pi N, \eta N, \pi \pi N, K\Lambda, K\Sigma channels to the F_2 structure function at Q^2 --> 0 limit up to W = 2 GeV.