717 citations · 4.8k across the 112 of their papers we have counts for
5 papers · 1 filter
Birefringent Gravitational Waves and the Consistency Check of Inflation
Stephon Alexander, Jerome Martin
In this work we show that the gravitational Chern-Simons term, aside from being a key ingredient in inflationary baryogenesis, modifies super-horizon gravitational waves produced d…
Can the string scale be related to the cosmic baryon asymmetry?
Stephon H. S. Alexander, S. James Gates
In a previous work, a mechanism was presented by which baryon asymmetry can be generated during inflation from elliptically polarized gravitons. Nonetheless, the mechanism only gen…
In the Realm of the Geometric Transitions
Stephon Alexander, Katrin Becker, Melanie Becker +3
We complete the duality cycle by constructing the geometric transition duals in the type IIB, type I and heterotic theories. We show that in the type IIB theory the background on t…
The Gravitational Instability of the Vacuum: Insight into the Cosmological Constant Problem
Stephon Alexander, Manasse Mbonye, John Moffat
A mechanism for suppressing the cosmological constant is developed, based on an analogy with a superconducting phaseshift in which free fermions coupled perturbatively to a weak gr…
Leptogenesis from Gravity Waves in Models of Inflation
Stephon H. S. Alexander, Michael E. Peskin, M. M. Sheikh-Jabbari
We present a new mechanism for creating the observed cosmic matter-antimatter asymmetry which satisfies all three Sakharov conditions from one common thread, gravitational waves. W…