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6 papers · 2 filters
Eliminating the eta-problem in SUGRA Hybrid Inflation with Vector Backreaction
Konstantinos Dimopoulos, George Lazarides, Jacques M. Wagstaff
It is shown that, when the inflaton field modulates the gauge kinetic function of the gauge fields in supergravity realisations of inflation, the dynamic backreaction leads to a ne…
The inflating curvaton
Konstantinos Dimopoulos, Kazunori Kohri, David H. Lyth +1
The primordial curvature perturbation ζmay be generated by some curvaton field σ, which is negligible during inflation and has more or less negligible interactions until it decays.…
Observable gravitational waves from inflation with small field excursions
Shaun Hotchkiss, Anupam Mazumdar, Seshadri Nadathur
The detection of primordial gravitational waves, or tensor perturbations, would be regarded as compelling evidence for inflation. The canonical measure of this is the ratio of tens…
Casimir force for cosmological domain walls
Tomohiro Matsuda
We calculate the vacuum fluctuations that may affect the evolution of cosmological domain walls. Considering domain walls, which are classically stable and have interaction with a…
Could our Universe have begun with Negative Lambda?
Tirthabir Biswas, Tomi Koivisto, Anupam Mazumdar
In this paper we present an informal description of the Cyclic Inflation scenario which allows our universe to "start" with a negative potential energy, inflate, and then gracefull…
Inflection point inflation: WMAP constraints and a solution to the fine-tuning problem
Shaun Hotchkiss, Anupam Mazumdar, Seshadri Nadathur
We consider observational constraints and fine-tuning issues in a renormalizable model of inflection point inflation, with two independent parameters. We derive constraints on the…