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Perturbations in bouncing cosmologies: dynamical attractor vs scale invariance
Paolo Creminelli, Alberto Nicolis, Matias Zaldarriaga
For bouncing cosmologies such as the ekpyrotic/cyclic scenarios we show that it is possible to make predictions for density perturbations which are independent of the details of th…
Primordial Bispectrum Information from CMB Polarization
Daniel Babich, Matias Zaldarriaga
After the precise observations of the Cosmic Microwave Background (CMB) anisotropy power spectrum, attention is now being focused on the higher order statistics of the CMB anisotro…
Single field consistency relation for the 3-point function
Paolo Creminelli, Matias Zaldarriaga
We point out the existence of a consistency relation involving the 3-point function of scalar perturbations which is valid in any inflationary model, independently of the inflaton…
The shape of non-Gaussianities
Daniel Babich, Paolo Creminelli, Matias Zaldarriaga
We study the dependence on configuration in momentum space of the primordial 3-point function of density perturbations in several different scenarios: standard slow-roll inflation,…
CMB 3-point functions generated by non-linearities at recombination
Paolo Creminelli, Matias Zaldarriaga
We study the 3-point functions generated at recombination in the squeezed triangle limit, when one mode has a wavelength much larger than the other two and is outside the horizon.…
Statistical Probes of Reionization With 21 cm Tomography
Steven Furlanetto, Matias Zaldarriaga, Lars Hernquist
We consider the degree to which "21 cm tomography" of the high-redshift Universe can distinguish different ionization histories. Using a new analytic model for the size distributio…
The Growth of HII Regions During Reionization
Steven Furlanetto, Matias Zaldarriaga, Lars Hernquist
Recently, there has been a great deal of interest in understanding the reionization of hydrogen in the intergalactic medium (IGM). One of the major outstanding questions is how thi…