• Publications
  • Influence
False vacuum inflation with Einstein gravity.
TLDR
Investigation of chaotic inflation models with two scalar fields, such that one field (the inflaton) rolls while the other is trapped in a false vacuum state, finds that false vacuum inflation occurs with the inflaton field far below the Planck scale, making it easier to implement in the context of supergravity than standard chaotic inflation.
Formalizing the slow-roll approximation in inflation.
TLDR
This work proposes a new measure of inflation, based upon contraction of the comoving Hubble length as opposed to the usual $e$-foldings of physical expansion, and derives relevant formulae from an infinite hierarchy of slow-roll parameters.
The dearth of halo dwarf galaxies: is there power on short scales?
N-body simulations of structure formation with scale-invariant primordial perturbations show significantly more virialized objects of dwarf-galaxy mass in a typical galactic halo than are observed
The inflationary energy scale.
  • Liddle
  • Physics
    Physical review. D, Particles and fields
  • 12 July 1993
The energy scale of inflation is of much interest, as it suggests the scale of grand unified physics, governs whether cosmological events such as topological defect formation can occur after
Perturbation spectra from intermediate inflation.
  • Barrow, Liddle
  • Physics
    Physical review. D, Particles and fields
  • 23 March 1993
TLDR
This work investigates models of `intermediate' inflation, where the scale factor $a(t)$ grows as a(t)=\mathrm{exp}(A{t}^{f})$, and finds that the perturbation spectral index $n$ can be greater than unity on astrophysical scales.
Reconstructing the inflaton potential: In principle and in practice.
TLDR
A full reconstruction of the functional form of the potential will not be possible within the foreseeable future, but with a knowledge of the dark matter components, it should soon be possible to combine intermediate-scale data with measurements of large-scale cosmic microwave background anisotropies to yield useful information regarding the potential.
The cosmology of black hole relics.
TLDR
A toy model in which black holes evaporate to leave a relic is provided, and the question of nucleation of such objects in a thermal bath of gravitons at high temperature is addressed.
Four-year COBE normalization of inflationary cosmologies.
  • Bunn, Liddle, White
  • Physics
    Physical review. D, Particles and fields
  • 5 July 1996
TLDR
This work fully includes the effect of the gravitational wave modes, including the predicted relation of the amplitude of these modes to that of the density perturbations, in models with and without gravitational waves.
Baryogenesis in extended inflation. II. Baryogenesis via primordial black holes.
TLDR
Baryogenesis at the end of extended inflation is studied and the possibility that the wall collisions may provide a significant density of primordial black holes is considered and their possible role in generating a baryon asymmetry is examined.
Observing the inflaton potential.
We show how observations of the density perturbation (scalar) spectrum and the gravitational wave (tensor) spectrum allow a reconstruction of the potential responsible for cosmological inflation. A
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