72 research outputs found
Macroscopic Loop Amplitudes in Two-Dimensional Dilaton Gravity
Macroscopic loop amplitudes are obtained for the dilation gravity in
two-dimensions. The dependence on the macroscopic loop length is completely
determined by using the Wheeler-DeWitt equation in the mini-superspace
approximation. The dependence on the cosmological constant is also
determined by using the scaling argument in addition.Comment: 23 pages, LaTeX, TIT/HEP-21
Monitoring Cascading Changes of Resources in the Kubernetes Control Plane
Kubernetes is a container management system that has many automated
functionalities. Those functionalities are managed by configuring objects and
resources in the control plane. Since most objects change their state depending
on other objects' states, a change propagates to other objects in a chain. As
cluster availability is influenced by the time required for these cascading
changes, it is essential to make the propagations measurable and shed light on
the behavior of the Kubernetes control plane. However, it is not easy because
each object constantly monitors other objects' status and acts autonomously in
response to their changes to play its role. In this paper, we propose a
measurement system that outputs objects' change logs published from the API
server in the control plane and assists in analyzing the time of cascading
changes between objects by utilizing the relationships among resources. With a
practical change scenario, our system is confirmed that it can measure change
propagation times within a cascading change. Also, measurements on the system
itself showed it has a small CPU and memory footprint
Generating Functions in Two Dimensional Quantum Gravity
We solve general 1-matrix models without taking the double scaling limit. A
method of computing generating functions is presented. We calculate the
generating functions for a simple and double torus. Our method is also
applicable to more higher genus. Each generating function can be expressed by a
``specific heat'' function for sphere. Universal terms, which are survived in
the double scaling limit can be easily picked out from our exact solutions. We
also find that the regular part of the spherical generating function is at most
bilinear in coupling constants of source terms.Comment: 43 pages, 3 encapsulated postscript figures, uses latex and epsf.st
An efficient method for computing genus expansions and counting numbers in the Hermitian matrix model
We present a method to compute the genus expansion of the free energy of
Hermitian matrix models from the large N expansion of the recurrence
coefficients of the associated family of orthogonal polynomials. The method is
based on the Bleher-Its deformation of the model, on its associated integral
representation of the free energy, and on a method for solving the string
equation which uses the resolvent of the Lax operator of the underlying Toda
hierarchy. As a byproduct we obtain an efficient algorithm to compute
generating functions for the enumeration of labeled k-maps which does not
require the explicit expressions of the coefficients of the topological
expansion. Finally we discuss the regularization of singular one-cut models
within this approach
Factorization in 2D String Theory
We show the factorization of correlation functions of tachyon operators in 2D
string theory using the discretized approach of Moore. Our demonstration of the
factorization is more general than that of the paper of Sakai and Tanii. We
obtain the rules for the factorization of tachyon amplitudes. Our results can
be understood in terms of the operator product expansion of tachyon operators.
We also give a systematic way of computing correlation functions of tachyon
operators and succeed in summarizing the results of the computation in compact
form for some simple cases. We confirm that these tachyon amplitudes indeed
satisfy our factorization rule.Comment: 10 pages, LaTeX, TIT/HEP-22
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