Clustering fossils from the early universe.

@article{Jeong2012ClusteringFF,
  title={Clustering fossils from the early universe.},
  author={Donghui Jeong and Marc Kamionkowski},
  journal={Physical review letters},
  year={2012},
  volume={108 25},
  pages={
          251301
        }
}
Many inflationary theories introduce new scalar, vector, or tensor degrees of freedom that may then affect the generation of primordial density perturbations. Here we show how to search a galaxy (or 21-cm) survey for the imprint of primordial scalar, vector, and tensor fields. These new fields induce local departures to an otherwise statistically isotropic two-point correlation function, or equivalently, nontrivial four-point correlation functions (or trispectra, in Fourier space), that can be… 

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