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Scaling Cosmologies from Duality Twisted Compactifications
James E. Lidsey, Karim A. Malik
Oscillating moduli fields can support a cosmological scaling solution in the presence of a perfect fluid when the scalar field potential satisfies appropriate conditions. We examin…
Gravitational Wave Constraints on DBI Inflation
James E. Lidsey, Ian Huston
An upper bound on the amplitude of the primordial gravitational wave spectrum generated during ultra-violet DBI inflation is derived. The bound is insensitive to the form of the in…
Cosmological perturbations in Palatini modified gravity
Kotub Uddin, James E Lidsey, Reza Tavakol
Two approaches to the study of cosmological density perturbations in modified theories of Palatini gravity have recently been discussed. These utilise, respectively, a generalisati…
Stretching the Inflaton Potential with Kinetic Energy
James E. Lidsey
Inflation near a maximum of the potential is studied when non-local derivative operators are included in the inflaton Lagrangian. Such terms can impose additional sources of fricti…