Neutrino Masses, Leptogenesis, and Unification in the Absence of Low Energy Supersymmetry (2008)
Fischler, Willy, Flauger, Raphael
We explore generating the dimension five operator leading to neutrino masses by integrating out heavy SU(2)_L triplet fermions. We exhibit a model that has a neutrino mass matrix consistent with...
Vacuum Bubble in an Inhomogeneous Cosmology (2007)
Fischler, Willy, Krishnan, Chethan, Paban, Sonia, Zanic, Marija
We study the propagation of bubbles of new vacuum in a radially inhomogeneous Lemaitre-Tolman-Bondi background that includes a cosmological constant. This exemplifies the classical evolution of a...
Meta-Stable Supersymmetry Breaking in a Cooling Universe (2006)
Fischler, Willy, Kaplunovsky, Vadim, Krishnan, Chethan, Mannelli, Lorenzo, Torres, Marcus
We look at the recently proposed idea that susy breaking can be accomplished in a meta-stable vacuum. In the context of one of the simplest models (the Seiberg-dual of super-QCD), we address the...
A Model for High Energy Scattering in Quantum Gravity (1999)
We present a model for high energy two body scattering in a quantum theory of gravity. The model is applicable for center of mass energies higher than the relevant Planck scale. At impact parameters...
Dualities versus Singularities (1998)
Banks, Tom, Fischler, Willy, Motl, Lubos
We show that a subgroup of the modular group of M-theory compactified on a ten torus, implies the Lorentzian structure of the moduli space, that is usually associated with naive discussions of...
The Operator Product Expansion for Wilson Loops and Surfaces in the Large N Limit (1998)
Berenstein, David, Corrado, Richard, Fischler, Willy, Maldacena, Juan
The operator product expansion for ``small'' Wilson loops in {\cal N}=4, d=4 SYM is studied. The OPE coefficients are calculated in the large N and g_{YM}^2 N limit by exploiting the AdS/CFT...
M(atrix) String Theory on K3 (1997)
Willy Fischler, Arvind Rajaraman
We conjecture that M-theory compactified on an ALE space (or K3) is described by 0-branes moving on the ALE space. We give evidence for this by showing that if we compactify another circle, we...
Berenstein, David, Corrado, Richard, Fischler, Willy, Paban, Sonia, Rozali, Moshe
Using a formalism developed to include collective coordinates, we calculate the contributions to S-matrix elements due to off-shell D-branes in a string coupling expansion. The formalism is further...
Collective coordinates for D-branes (1996)
Fischler, Willy, Paban, Sonia, Rozali, Moshe
We develope a formalism for the scattering off D-branes that includes collective coordinates. This allows a systematic expansion in the string coupling constant for such processes, including a...
Collective Coordinates in String Theory (1995)
Fischler, Willy, Paban, Sonia, Rozali, Moshe
The emergence of violations of conformal invariance in the form of non-local operators in the two-dimensional action describing solitons inevitably leads to the introduction of collective coordinates...
Gravitinos and a Low Ultimate Temperature for the Early Universe (1994)
We obtain new stronger bounds by orders of magnitude, on the ultimate temperature of the universe by exploiting the copious production of gravitinos at finite temperature.
Bounds on Microscopic Physics from P and T Violation in Atoms and Molecules (1992)
Fischler, Willy, Paban, Sonia, Thomas, Scott
Atomic and molecular electric dipole moments are calculated within the minimal supersymmetric standard model. Present experiments already provide strong bounds on the combination of phases...