Probing primordial non-Gaussianity with today's universe

          @misc{ scivideos_PIRSA:10030001,
            doi = {10.48660/10030001},
            url = {https://pirsa.org/10030001},
            author = {},
            keywords = {Cosmology},
            language = {en},
            title = {Probing primordial non-Gaussianity with today{\textquoteright}s universe},
            publisher = {Perimeter Institute for Theoretical Physics},
            year = {2010},
            month = {mar},
            note = {PIRSA:10030001 see, \url{https://scivideos.org/index.php/pirsa/10030001}}
          }
          

Abstract

Primordial non-Gaussianity has been traditionaly constrained using three-point function of the cosmic microwave background. Two years ago, however, Dalal et al have shown that non-Gaussianity of the local type induces a scale dependent bias for biased tracers of the underlying dark matter structure. This allows constraining of the primordial non-Gaussianity from measurements of large-scale structure provided by redshift surveys. I will discuss the technique, its theoretical aspects, it surprising resilience towards systematics and current results from the real data. I will also show some preliminary new results: extension to the two field inflationary models and the analogue of the Dalal effect in the Lyman alpha forest.