4,978 research outputs found
Tachyon Condensation and Spectrum of Strings on D-branes
We investigate spectrum of open strings on D-branes after tachyon
condensation in bosonic string theory. We calculate 1-loop partition function
of the string and show that its limiting forms coincide with partition
functions of open strings with different boundary conditions.Comment: 11 pages, references adde
Quantum Effects on Tachyon Dynamics
We investigate the relevance of quantum effects in the study of bulk tachyon
dynamics. We analyze the behavior of a system which consists of a tachyon, the
graviton and the dilaton through the use of the Wheeler-DeWitt equation in the
mini-superspace approximation, The singular behavior of the classical solution
for the system is modified so that the quantum behavior seems to be regular.Comment: 15 pages, references added, choice of the effective action was
mentione
On Large N Solution of Gaiotto-Tomasiello Theory
The planar solution is discussed for an N=3 Chern-Simons-matter theory
constructed recently by Gaiotto and Tomasiello. The planar resolvent is
obtained in terms of contour integrals. If the sum of two Chern-Simons levels
k_1,k_2 is small, the expectation value of a supersymmetric Wilson loop grows
exponentially with the total 't Hooft coupling, as is expected from AdS/CFT
correspondence. If one of the Chern-Simons levels, say k_2, is taken to
infinity, for which one of the 't Hooft coupling constants becomes zero, then
the exponential behavior disappears.Comment: 25 pages, (v2) references added, (v3) references added, typos
corrected, published versio
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