Browsing Institutt for teoretisk astrofysikk by Author "Lombriser, Lucas"

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  • Dark degeneracy I: Dynamical or interacting dark energy? 
    Von Marttens, Rodrigo F.; Lombriser, Lucas; Kunz, Martin; Marra, Valerio; Casarini, Luciano; Alcaniz, Jailson (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2020)
    We revisit the dark degeneracy that arises from the Einstein equations relating geometry to the total cosmic substratum but not resolving its individual components separately. We establish the explicit conditions for the ...
  • Emulators for the nonlinear matter power spectrum beyond ΛCDM 
    Winther, Hans Arnold; Casas, Santiago; Baldi, Marco; Koyama, Kazuya; Li, Baojiu; Lombriser, Lucas; Zhao, Gong-Bo (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2019)
    Accurate predictions for the nonlinear matter power spectrum are needed to confront theory with observations in current and near future weak-lensing and galaxy clustering surveys. We propose a computationally cheap method ...
  • Hybrid Pℓ(k): general, unified, non-linear matter power spectrum in redshift space 
    Bose, Benjamin; Winther, Hans Arnold; Pourtsidou, Alkistis; Casas, Santiago; Lombriser, Lucas; Xia, Qianli; Cataneo, Matteo (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2020)
    Constraints on gravity and cosmology will greatly benefit from performing joint clustering and weak lensing analyses on large-scale structure data sets. Utilising non-linear information coming from small physical scales ...