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16 papers · 2 filters
Exact Scale-Invariant Background of Gravitational Waves from Cosmic Defects
Daniel G. Figueroa, Mark Hindmarsh, Jon Urrestilla
We demonstrate that any scaling source in the radiation era produces a background of gravitational waves with an exact scale-invariant power spectrum. Cosmic defects, created after…
Curvaton Decay by Resonant Production of the Standard Model Higgs
Kari Enqvist, Daniel G. Figueroa, Rose N. Lerner
We investigate in detail a model where the curvaton is coupled to the Standard Model higgs. Parametric resonance might be expected to cause a fast decay of the curvaton, so that it…
On the fate of coupled flat directions during inflation
Juan C. Bueno Sánchez, Kari Enqvist
We investigate the stochastic dynamics of the long wavelength modes of a generic light scalar field that during inflation is coupled to another scalar field. The coupling plays an…
A Consistent Approach to Falsifying Lambda-CDM with Rare Galaxy Clusters
Ian Harrison, Shaun Hotchkiss
We consider methods with which to answer the question "is any observed galaxy cluster too unusual for Lambda-CDM?" After emphasising that many previous attempts to answer this ques…
Modulated preheating and isocurvature perturbations
Kari Enqvist, Stanislav Rusak
We consider a model of preheating where the coupling of the inflaton to the preheat field is modulated by an additional scalar field which is light during inflation. We establish t…
Electrically charged curvaton
Michela D'Onofrio, Rose N. Lerner, Arttu Rajantie
We consider the possibility that the primordial curvature perturbation was generated through the curvaton mechanism from a scalar field with an electric charge, or precisely the St…