Author:
Carrasco John Joseph M.,Hertzberg Mark P.,Senatore Leonardo
Abstract
Abstract
Large scale structure surveys will likely become the next leading cosmological probe. In our universe, matter perturbations are large on short distances and small at long scales, i.e. strongly coupled in the UV and weakly coupled in the IR. To make precise analytical predictions on large scales, we develop an effective field theory formulated in terms of an IR effective fluid characterized by several parameters, such as speed of sound and viscosity. These parameters, determined by the UV physics described by the Boltzmann equation, are measured from N-body simulations. We find that the speed of sound of the effective fluid is
$ c_s^2 \approx {1}{0^{{ - {6}}}}{c^{2}} $
and that the viscosity contributions are of the same order. The fluid describes all the relevant physics at long scales k and permits a manifestly convergent perturbative expansion in the size of the matter perturbations δ(k) for all the observables. As an example, we calculate the correction to the power spectrum at order δ(k)4. The predictions of the effective field theory are found to be in much better agreement with observation than standard cosmological perturbation theory, already reaching percent precision at this order up to a relatively short scale k ⋍ 0.24h Mpc−1.
Publisher
Springer Science and Business Media LLC
Subject
Nuclear and High Energy Physics
Reference35 articles.
1. C. Cheung, P. Creminelli, A.L. Fitzpatrick, J. Kaplan and L. Senatore, The effective field theory of inflation, JHEP
03 (2008) 014 [arXiv:0709.0293] [INSPIRE].
2. L. Senatore and M. Zaldarriaga, The effective field theory of multifield inflation, JHEP
04 (2012) 024 [arXiv:1009.2093] [INSPIRE].
3. S. Weinberg, The quantum theory of fields. Vol. 2: modern applications, Cambridge University Press, Cambridge U.K. (1996).
4. T. Baldauf, U. Seljak, L. Senatore and M. Zaldarriaga, Galaxy bias and non-linear structure formation in general relativity, JCAP
10 (2011) 031 [arXiv:1106.5507] [INSPIRE].
5. D. Baumann, A. Nicolis, L. Senatore and M. Zaldarriaga, Cosmological non-linearities as an effective fluid, arXiv:1004.2488 [INSPIRE].
Cited by
397 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献