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Limits of QuasiStatic Approximation in ModifiedGravity Cosmologies
We investigate the limits of applicability of the quasistatic approximation in cosmologies featuring general models of dark energy or modified gravity. We show that, at best, the quasistatic approximation breaks down outside of the sound horizon of the darkenergy, rather than the cosmological hor... Full description
Contributors: 
Sawicki, Ignacy
 Author Bellini, Emilio  Author 
Published: 
2015

Contained in:  arXiv.org (2015) vom: 23. März 
Journal Title:  arXiv.org 
Fulltext access:  Fulltext access (direct link  free access) 10.1103/PhysRevD.92.084061
Availability is being checked...

Links: 
Volltext (dx.doi.org) Volltext (arxiv.org) 
DOI: 
10.1103/PhysRevD.92.084061 
Language: 
English 
ID (e.g. DOI, URN): 
10.1103/PhysRevD.92.084061 
PPN (CatalogueID):  XAR016003160 
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520  a We investigate the limits of applicability of the quasistatic approximation in cosmologies featuring general models of dark energy or modified gravity. We show that, at best, the quasistatic approximation breaks down outside of the sound horizon of the darkenergy, rather than the cosmological horizon as is frequently assumed. When the sound speed of dark energy is significantly below that of light, the quasistatic limit is only valid in a limited range of observable scales and this must be taken into account when computing effects on observations in such models. As an order of magnitude estimate, in the analysis of data from today's weaklensing and peculiarvelocity surveys, dark energy can be modelled as quasistatic only if the sound speed is larger than order 1% of that of light. In upcoming surveys, such as Euclid, it should only be used when the sound speed exceeds around 10% of the speed of light. In the analysis of the cosmic microwave background, the quasistatic limit should never be used for the integrated SachsWolf effect and for lensing only when the sound speed exceeds 10% of the speed of light.  
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