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Twenty-five Questions for String Theorists
Pierre Binetruy, G. L. Kane, Joseph Lykken +1
In an effort to promote communication between the formal and phenomenological branches of the high-energy theory community, we provide a description of some important issues in sup…
Gravity in a Box
Joseph Lykken, Robert C. Myers, Jing Wang
We consider a brane-world construction which incorporates a finite region of flat space, ``the box,'' surrounded by a region of anti-de Sitter space. This hybrid construction provi…
The Shape of Gravity
Joseph Lykken, Lisa Randall
In a nontrivial background geometry with extra dimensions, gravitational effects will depend on the shape of the Kaluza-Klein excitations of the graviton. We investigate a consiste…
Branes with GUTs and supersymmetry breaking
Joseph Lykken, Erich Poppitz, Sandip P. Trivedi
We study Type I string theory compactified on a T^6/Z_3 orientifold. The low-energy dynamics is most conveniently analyzed in terms of D3-branes. We show that a sector of the theor…
M(ore) on Chiral Gauge Theories from D-Branes
J. Lykken, E. Poppitz, S. P. Trivedi
We consider a brane configuration consisting of intersecting Neveu-Schwarz five-branes, Dirichlet four-branes, and an orientifold four-plane in a C^2/Z_3 orbifold background. We sh…
Chiral Gauge Theories from D-Branes
Joseph Lykken, Erich Poppitz, Sandip P. Trivedi
We construct brane configurations leading to chiral four dimensional N=1 supersymmetric gauge theories. The brane realizations consist of intersecting Neveu-Schwarz five-branes and…
String Model Building in the Age of D-Branes
Joseph D. Lykken
The string duality revolution calls into question virtually all of the working assumptions of string model builders. A number of difficult questions arise. I use fractional charge…
Weak Scale Superstrings
Joseph D. Lykken
Recent developments in string duality suggest that the string scale may not be irrevocably tied to the Planck scale. Two explicit but unrealistic examples are described where the r…
Three Generations in the Fermionic Construction
Shyamoli Chaudhuri, George Hockney, Joseph D. Lykken
We obtain three generation SU(3)_c X SU(2)_L X U(1)_Y string models in all of the exactly solvable (0,2) constructions sampled by fermionization. None of these examples, including…
Maximally Supersymmetric String Theories in D<10
Shyamoli Chaudhuri, G. Hockney, Joseph D. Lykken
The existence of maximally supersymmetric solutions to heterotic string theory that are not toroidal compactifications of the ten-dimensional superstring is established. We constru…
Exact Path Integrals by Equivariant Cohomology
Hans Dykstra, Joe Lykken, Eric Raiten
It is a common belief among field theorists that path integrals can be computed exactly only in a limited number of special cases, and that most of these cases are already known. H…
String Theory, Black Holes, and SL(2,R) Current Algebra
Shyamoli Chaudhuri, Joseph D. Lykken
We analyse in detail the black hole by extending standard techniques of Kac-Moody current algebra to the non-compact case. We construct the elements of the ground ring an…