386 citations · 1.3k across the 33 of their papers we have counts for
15 papers · 1 filter
SUGRA chaotic inflation and moduli stabilisation
Stephen C. Davis, Marieke Postma
Chaotic inflation predicts a large gravitational wave signal which can be tested by the upcoming Planck satellite. We discuss a SUGRA implementation of chaotic inflation in the pre…
Microphysics of Cosmic Strings in Supersymmetric and Grand Unified Theories
Stephen C. Davis
In this thesis we investigate the microphysics of cosmic strings in non-minimal quantum field theories. In particular we consider theories in which fermion fields couple to the str…
Vacuum Decay on a Brane World
Stephen C. Davis, Sylvain Brechet
The bubble nucleation rate for a first order phase transition occurring on a brane world is calculated. Both the Coleman-de Luccia thin wall instanton and the Hawking-Moss instanto…
Brane Cosmology Solutions with Bulk Scalar Fields
Stephen C. Davis
Brane cosmologies with static, five-dimensional and Z_2 symmetric bulks are analysed. A general solution generating mechanism is outlined. The qualatitive cosmological behaviour of…
Cosmological Phase Transitions in a Brane World
Stephen C. Davis, Warren B. Perkins, Anne-Christine Davis +1
In brane world scenarios the Friedmann equation is modified, resulting in an increased expansion at early times. This has important effects on cosmological phase transitions which…
Cosmic Strings and Cooper Pairs
Stephen C. Davis
It is shown that it is possible for bound fermions on a cosmic string to form a superconducting state. Due to the attractive force between them, particles moving in opposite direct…
Brane World Linearized Cosmic String Gravity
Stephen C. Davis
The gravitational properties of cosmic strings in the Randall-Sundrum brane world scenario are investigated. Using a gauge in which the brane remains straight, the leading order co…
Brane World Cosmology Without the Z_2 Symmetry
Anne-Christine Davis, Ian Vernon, Stephen C. Davis +1
The Friedmann equation for a positive tension brane situated between two bulk spacetimes that posses the same 5D cosmological constant, but which does not posses a Z_2 symmetry of…
The Fate of Cosmic String Zero Modes
Anne-Christine Davis, Stephen C. Davis, Warren B. Perkins
Cosmic strings in realistic particle physics models have fermion zero modes in the string core. Such zero modes change the underlying cosmology; for example, the string can carry a…
Cosmic String Current Stability
Stephen C. Davis, Warren B. Perkins, Anne-Christine Davis
The stability of fermionic charge carriers on cosmic strings is considered. We show that neutral fermion currents in cosmic strings are always chiral or time-like, in contrast to t…
Destruction of Fermion Zero Modes on Cosmic Strings
Stephen C. Davis
I examine the existence of zero energy fermion solutions (zero modes) on cosmic strings in an SO(10) grand unified theory. The current carrying capability of a cosmic string formed…
Cosmic Strings, Zero Modes and SUSY breaking in Nonabelian N=1 Gauge Theories
Stephen C. Davis, Anne C. Davis, Mark Trodden
We investigate the microphysics of cosmic strings in Nonabelian gauge theories with N=1 supersymmetry. We give the vortex solutions in a specific example and demonstrate that fermi…
Cosmic String Zero Modes and Multiple Phase Transitions
Stephen C. Davis, Anne-Christine Davis, Warren B. Perkins
The zero modes and current carrying capability of a cosmic string formed at one phase transition can be modified at subsequent phase transitions. A new, generalised index theorem i…
N=1 Supersymmetric Cosmic Strings
Stephen C. Davis, Anne-Christine Davis, Mark Trodden
We investigate the microphysics of supersymmetric cosmic strings. In particular we focus on the vortices admitted by N=1 supersymmetric abelian Higgs models. We find the vortex sol…
Microphysics of SO(10) Cosmic Strings
Anne-Christine Davis, Stephen C. Davis
We uncover a rich microphysical structure for SO(10) cosmic strings. For the abelian string the electroweak symmetry is restored around it in a region depending on the electroweak…