Concept
De Sitter universe
Related publications (44)
Dépasser les bornes ; coordonner la planification dans la métropole fragmentée
L'intensification des flux, l'augmentation démographique et l'expansion de l'urbanisation ont tout au long du siècle dernier contribué à l'étalement des aires urbaines bien au-delà des limites institutionnelles héritées des anciennes villes-centres. Les ag ...
MétisPresses2019Time-sliced perturbation theory with primordial non-Gaussianity and effects of large bulk flows on inflationary oscillating features
We extend the formalism of time-sliced perturbation theory (TSPT) for cosmological large-scale structure to include non-Gaussian initial conditions. We show that in such a case the TSPT interaction vertices acquire new contributions whose time-dependence f ...
IOP PUBLISHING LTD2019Frame (in)equivalence in quantum field theory and cosmology
We revisit the question of frame equivalence in Quantum Field Theory in the presence of gravity, a situation of relevance for theories aiming to describe the early Universe dynamics and Inflation in particular. We show that in those cases, the path integra ...
Springer2019Cosmological Constraints from Multiple Probes in the Dark Energy Survey
Yi Zhang, Eduardo Sanchez, Mingkui Wang, Jonathan Andrew Blazek, Yue Pan
The combination of multiple observational probes has long been advocated as a powerful technique to constrain cosmological parameters, in particular dark energy. The Dark Energy Survey has measured 207 spectroscopically confirmed type Ia supernova light cu ...
AMER PHYSICAL SOC2019Backreaction of electromagnetic fields and the Schwinger effect in pseudoscalar inflation magnetogenesis
We study magnetogenesis in axionlike inflation driven by a pseudoscalar field phi coupled axially to the electromagnetic (EM) field (beta/M-p)phi F-mu nu(F) over tilde mu nu with dimensionless coupling constant beta. A set of equations for the inflaton fie ...
2019Influence of backreaction of electric fields and Schwinger effect on inflationary magnetogenesis
We study the generation of electromagnetic fields during inflation when the conformal invariance of Maxwell's action is broken by the kinetic coupling f(2)(phi)F mu nu F mu nu of the electromagnetic field to the inflaton field phi We consider the case wher ...
2018Cosmological constraints from the convergence 1-point probability distribution
We examine the cosmological information available from the 1-point probability density function (PDF) of the weak-lensing convergence field, utilizing fast L-PICOLA simulations and a Fisher analysis. We find competitive constraints in the Omega(m)-sigma(8) ...
Oxford Univ Press2017Measurement of baryon acoustic oscillation correlations at z=2.3 with SDSS DR12 Ly alpha-Forests
Here, we use flux-transmission correlations in Ly alpha forests to measure the imprint of baryon acoustic oscillations (BAO). The study uses spectra of 157,783 quasars in the redshift range 2.1
Edp Sciences S A2017On the dark radiation problem in the axiverse
String scenarios generically predict that we live in a so called axiverse: the Universe with about a hundred of light axion species which are decoupled from the Standard Model particles. However, the axions can couple to the inflaton which leads to their p ...
Iop Publishing Ltd2017Time-sliced perturbation theory for large scale structure I: general formalism
Sergey Sibiryakov, Diego Blas Temino, Mikhail Ivanov
We present a new analytic approach to describe large scale structure formation in the mildly non-linear regime. The central object of the method is the time-dependent probability distribution function generating correlators of the cosmological observables ...
Iop Publishing Ltd2016