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A Cosmic Microscope for the Preheating Era

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If you have a question about this talk, please contact Francesca Chadha-Day .

Please note this is an internal colloquium for members of the University of Cambridge and others with strong connections to the HEP and GR groups

Light fields with spatially varying backgrounds can modulate cosmic preheating, and imprint the nonlinear effects of preheating dynamics at tiny scales on large scale fluctuations. This provides us a unique probe into the preheating era which we dub the “cosmic microscope.’’ We identify a distinctive effect of preheating on scalar perturbations that turns the Gaussian primordial fluctuations of a light scalar field into square waves, like a diode. The effect manifests itself as local non-Gaussianity. We present a model, “modulated partial preheating,” where this nonlinear effect is consistent with current observations and can be reached by near future cosmic probes.

This talk is part of the Theoretical Physics Colloquium series.

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