Time-sliced perturbation theory II: baryon acoustic oscillations and infrared resummation

We use time-sliced perturbation theory (TSPT) to give an accurate description of the infrared non-linear effects affecting the baryonic acoustic oscillations (BAO) present in the distribution of matter at very large scales. In TSPT this can be done via a systematic resummation that has a simple diagrammatic representation and does not involve uncontrollable approximations. We discuss the power counting rules and derive explicit expressions for the resummed matter power spectrum up to next-to leading order and the bispectrum at the leading order. The two-point correlation function agrees well with N-body data at BAO scales. The systematic approach also allows to reliably assess the shift of the baryon acoustic peak due to non-linear effects.


Published in:
Journal Of Cosmology And Astroparticle Physics, 7, 028
Year:
2016
Publisher:
Bristol, Iop Publishing Ltd
ISSN:
1475-7516
Keywords:
Laboratories:




 Record created 2016-10-18, last modified 2018-03-17


Rate this document:

Rate this document:
1
2
3
 
(Not yet reviewed)