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Dynamics of Assisted Inflation
Karim A. Malik, David Wands
We investigate the dynamics of the recently proposed model of assisted inflation. In this model an arbitrary number of scalar fields with exponential potentials evolve towards an i…
Axion perturbation spectra in string cosmologies
E. J. Copeland, James E. Lidsey, David Wands
We discuss the semi-classical perturbation spectra produced in the massless fields of the low energy string action in a pre big bang type scenario. Axion fields may possess an almo…
Duality Invariance of Cosmological Perturbation Spectra
David Wands
I show that cosmological perturbation spectra produced from quantum fluctuations in massless or self-interacting scalar fields during an inflationary era remain invariant under a t…
Black holes and gravitational waves in concert - a probe of superstring cosmology
Edmund J. Copeland, Andrew R. Liddle, James E. Lidsey +1
Two strands of observational gravitation, one the search for astrophysical evidence of primordial black holes and the other the search for gravitational waves, may combine to provi…
Gauge-Invariant Variables on Cosmological Hypersurfaces
Karim A. Malik, David Wands
We show how gauge-invariant cosmological perturbations may be constructed by an unambiguous choice of hypersurface-orthogonal time-like vector field (i.e., time-slicing). This may…
Black holes and gravitational waves in string cosmology
Edmund J Copeland, Andrew R Liddle, James E Lidsey +1
Pre--big bang models of inflation based on string cosmology produce a stochastic gravitational wave background whose spectrum grows with decreasing wavelength, and which may be det…