16844941
ADHM is tachyon condensation
We completely realize the ADHM construction of instantons in D-brane language of tachyon condensations. Every step of the construction is given a physi- cal interpretation in string theory, in a boundary state formalism valid all order in � ' . Accordingly, equivalence between Yang-Mills configurations on D4-branes and D0-branes inside the D4-branes is proven, which shows that small instanton config- urations of the Yang-Mills fields are protected against stringy � ' corrections. We provide also D-brane realizations of the inverse ADHM construction, the complete- ness, and the noncommutative ADHM construction.
8625540
Solitons in supersymmety breaking meta-stable vacua
In recently found supersymmetry-breaking meta-stable vacua of the supersymmetric QCD, we examine possible exsitence of solitons. Homotopy groups of the moduli space of the meta-stable vacua show that there is no nontrivial soliton for SU(Nc) gauge group. When U(1)B symmetry present in the theory is gauged, we find non-BPS solitonic (vortex) strings whose existence and properties are predicted from brane configurations. We obtain explicit classical solutions which reproduce the predicitions. For SO(Nc) gauge group, we find there are solitonic strings for N≡Nf−Nc+4 = 2, and Z2 strings for the other N. The strings are meta-stable as they live in the meta-stable vacua.
119042303
3-STRING JUNCTION AND BPS SATURATED SOLUTIONS IN SU(3) SUPERSYMMETRIC YANG-MILLS THEORY
Abstract We construct BPS saturated regular configurations of N =4 SU(3) supersymmetric Yang-Mills theory carrying non-parallel electric and magnetic charges. These field theory BPS states correspond to the string theory BPS states of 3-string junctions connecting three different D3-branes by regarding the N =4 supersymmetric Yang-Mills theory as an effective field theory on parallel D3-branes.
119306019
Three-body nuclear forces from a matrix model
We compute three-body nuclear forces at short distances by using the nuclear matrix model of holographic QCD proposed in our previous paper with P. Yi. We find that the three-body forces at short distances are repulsive for (a) aligned three neutrons with averaged spins, and (b) aligned proton-proton-neutron/ proton-neutron-neutron. These indicate that in dense states of neutrons such as cores of neutron stars, or in Helium3/ tritium nucleus, the repulsive forces are larger than the ones estimated from two-body forces only.
1062593
Stringy derivation of Nahm construction of monopoles
We derive the Nahm construction of monopoles from exact tachyon condensation on unstable D-branes. The Dirac operator used in the Nahm construction is identified with the tachyon profile in our D-brane approach, and we provide physical interpretation of the procedures Nahm gave. Crucial is the introduction of infinite number of brane-antibranes from which arbitrary D-brane can be constrcuted, exhibitting a unified view of various D-branes. We explicitly show the equivalence of the D3-brane boundary state with the monopole profile and the D1-brane boundary state with the Nahm data as transverse scalars.
14363850
BIRTH OF CLOSED STRINGS AND DEATH OF OPEN STRINGS DURING TACHYON CONDENSATION
The tremendous progress achieved through the study of black holes and branes suggests that their time-dependent generalizations called Spacelike branes (S-branes) may prove similarly useful. An example of an established approach to S-branes is to include a string boundary interaction and we first summarize evidence for the death of open string degrees of freedom for the homogeneous rolling tachyon on a decaying brane. Then, we review how to extract the flat S-brane worldvolumes describing the homogeneous rolling tachyon and how large deformations correspond to creation of lower dimensional strings and branes. These S-brane worldvolumes are governed by S-brane actions which are on equal footing to D-brane actions, since they are derived by imposing conformality on the string worldsheet, as well as by analyzing fluctuations of time-dependent tachyon configurations. As further examples we generalize previous solutions of the S-brane actions so as to describe multiple decaying and nucleating closed fundamenta...
119245910
Development of lattice QCD tool kit on cell broadband engine processor
Research Institute for Information Science and Education, Hiroshima University,Higashi-Hiroshima, Hiroshima, 739-8521, JapanE-mail: nakamura@riise.hiroshima-u.ac.jpWe report an implementation of a code for SU(3) matrix multiplication on Cell/B.E., which is apart of our project, Lattice Tool Kit on Cell/B.E.. On QS20, the speed of the matrix multiplicationon SPE in single precision is 227GFLOPS and it becomes 20GFLOPS together with data transferfrom main memory by DNA transfer, which is 4.6% of the hardware peak speed (460GFLOPS),and is 7.4% of the theoretical peak speed of this calculation (268.77GFLOPS). We brieﬂy describeour tuning procedure.The XXVII International Symposium on Lattice Field Theory - LAT2009July 26-31 2009Peking University, Beijing, China
17561372
The static quark potential in 2+1 flavour Domain Wall QCD from QCDOC
We report our present status of on-going project on the measurement of the static quark potential in 2+1 flavour domain wall QCD with various improved gauge actions and couplings. Lattice spacing determined from Sommer scale on these ensembles are from 1.6 GeV to 2.0 GeV for $16^3 \times 32$ lattice with fifth dimension size 8. We also examine size of discretization error from scaling of a pair of dimensionless quantities, $(r_0 m_\pi)^2$ and $r_0 m_\rho$, and found small scaling violation.