2017
DOI: 10.1088/1475-7516/2017/04/023
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Early cosmology constrained

Abstract: Abstract. We investigate our knowledge of early universe cosmology by exploring how much additional energy density can be placed in different components beyond those in the ΛCDM model. To do this we use a method to separate early-and late-universe information enclosed in observational data, thus markedly reducing the model-dependency of the conclusions. We find that the 95% credibility regions for extra energy components of the early universe at recombination are: non-accelerating additional fluid density para… Show more

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Cited by 47 publications
(65 citation statements)
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“…This is in contrast to[3], which appears to find that allowing for non-zero curvature causes no increase in the most likely value of…”
mentioning
confidence: 62%
See 1 more Smart Citation
“…This is in contrast to[3], which appears to find that allowing for non-zero curvature causes no increase in the most likely value of…”
mentioning
confidence: 62%
“…While the LP and the SH are useful for performing the PG-BAO measurements, their lengths can also be estimated from other cosmological probes (e.g. [3]). This allows us to perform consistency checks among different cosmological observations (e.g.…”
Section: Methodsmentioning
confidence: 99%
“…We use an open source python package emcee When we constrain parameters of curve-ΛCDM, we add another prior P(Ω Λ ) = U[0.6, 0.8] to constrain Ω k more precisely. Verde et al (2017b) constrained the early cosmology from current CMB observations without any assumptions of late-time cosmology. They model-independently measured the value of r d as r d = 147.4 ± 0.7 Mpc.…”
Section: Resultsmentioning
confidence: 99%
“…bined with the CMB power spectrum, although adding in the recent DES Y1 clustering analysis (DES Collaboration 2018) relaxes these constraints to m µ < 0.29 eV. Verde et al (2017) calculated the effect on r s due to all remaining observationally allowed contributions of dark radiation, and found r s = 150 ± 5 Mpc. We therefore test our sensitivity to the possibility of early dark radiation by repeating our analysis with this wider prior on r s .…”
Section: Bao Calibrationmentioning
confidence: 99%