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8 papers · 2 filters
The cosmological constant in the brane world of string theory on
Anzhong Wang, N. O. Santos
Orbifold branes in string theory are investigated, and the general field equations on the branes are given explicitly for type II and heterotic string. It is shown that the effecti…
A Note on a Standard Embedding on Half-Flat Manifolds
Tibra Ali, Gerald B. Cleaver
It is argued that the ten dimensional solution that corresponds to the compactification of heterotic string theory on a half-flat manifold is the product space-tim…
On the all-order epsilon-expansion of generalized hypergeometric functions with integer values of parameters
M. Yu. Kalmykov, B. F. L. Ward, S. A. Yost
We continue our study of the construction of analytical coefficients of the epsilon-expansion of hypergeometric functions and their connection with Feynman diagrams. In this paper,…
Computation of determinants using contour integrals
Klaus Kirsten, Paul Loya
It is shown how the pre-exponential factor of the Feynman propagator for a large class of potentials can be computed using contour integrals. This is of direct relevance in the con…
Multiple (inverse) binomial sums of arbitrary weight and depth and the all-order epsilon-expansion of generalized hypergeometric functions with one half-integer value of parameter
M. Yu. Kalmykov, B. F. L. Ward, S. A. Yost
We continue the study of the construction of analytical coefficients of the epsilon-expansion of hypergeometric functions and their connection with Feynman diagrams. In this paper,…
Colliding Branes and Formation of Spacetime Singularities
Andreas Tziolas, Anzhong Wang
We construct a class of analytic solutions with two free parameters to the five-dimensional Einstein field equations, which represents the collision of two timelike 3-branes. We st…