HIP NEWS May 13th 2013
Tuesday 14 May 2013 at 10.15 in A315
Laura Bethke (Imperial College)
Anisotropic Gravitational Wave Background from Massless Preheating
Abstract: Gravitational waves (GWs) are an exciting phenomenon in Cosmology. Although they are hard to detect, GWs from different sources have different spectral signatures and can travel freely to us from their emission until today, providing a new wealth of information about the early Universe. In this talk I will describe how massless preheating after inflation leads to a strongly anisotropic GW background, even on large angular scales. This effect is caused by the presence of a light scalar field and could therefore be expected in many different models. If future experiments are able to observe the GW background from preheating, these anisotropies could provide a way to distinguish different models of preheating and inflation.
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