Talk detail

Participant	Hellwing, Wojciech
Institution	Institute for Computational Cosmology, Durham University - South Road - Durham - County Durham - Poland

Session	OC4	Accepted	Yes	Order	6	Time	16:30 - 16:50
Talk	Oral abstract	Title	Skewness as a probe of Baryon Acousitc Osscillations
Co-authors	Roman Juszkiewicz, Rien van de Weygaert
Abstract	We use perturbation theory to investigate the Baryon Acoustic Oscillations signature in the reduced third moment of the cosmic density field - the skewness $S_3$. We show that for various cosmological models the corresponding signal in the matter fluctuations power spectrum is also carried out to the volume-averaged skewness. Although the BAO signal seen in the skewness has lower amplitude when compare to two-point statistics it provide a potentially interesting BAO probe thanks to its weak sensitivity redshift distortions effects. The $S_3$ is also linear-bias free and the BAO signal appears here at smaller scales compared to 2-point statistics. We show that the main BAO feature in skewness for the WMAP7 normalisation appears at $\sim82\hmpc$ with the maximal wiggle amplitude of $~3\%$. Possible future detection of the BAO wiggles signature in the skewness can give us more insights into tantalising nature of the Dark Energy.