期刊
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
卷 -, 期 5, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/1475-7516/2014/05/022
关键词
dark matter theory; particle physics - cosmology connection; baryon acoustic oscillations; cosmological perturbation theory
资金
- NSF [AST-0807444, PHY-1068380]
- DOE [DE-FG02-90ER40542]
- German Science Foundation (DFG) within the Collaborative Research Center (SFB) 676 'Particles, Strings and the Early Universe'
- DOE Early Career Award [DE-FG02-12ER41854]
- National Science Foundation [PHY-0855425, AST-0907969, PHY-1213563]
- David & Lucile Packard Foundation
- Division Of Astronomical Sciences
- Direct For Mathematical & Physical Scien [0907969] Funding Source: National Science Foundation
- Division Of Physics
- Direct For Mathematical & Physical Scien [1213563] Funding Source: National Science Foundation
We introduce a Lagrangian-space Effective Field Theory (LEFT) formalism for the study of cosmological large scale structures. Unlike the previous Eulerian-space construction, it is naturally formulated as an effective field theory of extended objects in Lagrangian space. In LEFT the resulting finite size effects are described using a multipole expansion parameterized by a set of time dependent coefficients and organized in powers of the ratio of the wavenumber of interest k over the non-linear scale k(NL). The multipoles encode the effects of the short distance modes on the long-wavelength universe and absorb UV divergences when present. There are no IR divergences in LEFT. Some of the parameters that control the perturbative approach are not assumed to be small and can be automatically resummed. We present an illustrative one-loop calculation for a power law universe. We describe the dynamics both at the level of the equations of motion and through an action formalism.
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