13 citations · 36 across the 8 of their papers we have counts for
8 papers
On the Classical and Quantum Stability of a Cosmic Ghost
Stephon Alexander, Sam Cormack, David Lowe +1
Ghost fields have reemerged in a handful of phenomenologically motivated cosmological and particle physics scenarios, and most recently in a cyclic mechanism to address the fine-tu…
Chirality and Circular Polarization in Models of Inflation
Stephon Alexander, Sam Cormack, Robert Sims
We investigate the possibility that a chiral asymmetry during inflation can manifest as net circular polarization in photons. Using an example known to produce a helicity imbalance…
Active galaxies can make axionic dark energy
Konstantinos Dimopoulos, Sam Cormack
AGN jets carry helical magnetic fields, which can affect dark matter if the latter is axionic. This preliminary study shows that, in the presence of strong helical magnetic fields,…
A Cyclic Universe Approach to Fine Tuning
Stephon Alexander, Sam Cormack, Marcelo Gleiser
We present a closed bouncing universe model where the value of coupling constants is set by the dynamics of a ghost-like dilatonic scalar field. We show that adding a periodic pote…
Gravitational-Wave Mediated Preheating
Stephon Alexander, Sam Cormack, Antonino Marcianò +1
We propose a new preheating mechanism through the coupling of the gravitational field to both the inflaton and matter fields, without direct inflaton-matter couplings. The inflaton…
Finite Temperature Dipolar ultra-cold Bose gas with Exchange Interactions
S. C. Cormack, D. A. W. Hutchinson
We develop finite temperature theory for a trapped dipolar Bose gas including thermal exchange interactions. Previous treatments neglected these, difficult to compute, terms. We pr…
Simulation of magnetoresistance in disordered ultracold atomic Bose gases
J. Towers, S. C. Cormack, D. A. W. Hutchinson
Anderson localization was first investigated in the context of electrons in solids. One of the successes was in explaining the puzzle of negative magneto-resistance - as early as t…
Rotons in interacting ultracold Bose gases
Samuel C. Cormack, Dániel Schumayer, David A. W. Hutchinson
In three dimensions, non-interacting bosons undergo Bose-Einstein condensation at a critical temperature, , which is slightly shifted by , if the particles…