2 papers
astro-ph1998
Quintessence, Cosmic Coincidence, and the Cosmological Constant
Ivaylo Zlatev, Limin Wang, Paul J. Steinhardt
Recent observations suggest that a large fraction of the energy density of the universe has negative pressure. One explanation is vacuum energy density; another is quintessence in…
astro-ph1997
Density Perturbations in Multifield Inflationary Models
V. F. Mukhanov, Paul J. Steinhardt
We derive a closed-form, analytical expression for the spectrum of long-wavelength density perturbations in inflationary models with two (or more) inflaton degrees of freedom that…