Browsing Institutt for teoretisk astrofysikk by Author "Hassani, Farbod"

Now showing items 1-9 of 9

  • A generic instability in clustering dark energy? 
    Hassani, Farbod; Adamek, Julian; Kunz, Martin; Shi, Pan; Wittwer, Peter (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
    In this paper, we study the effective field theory (EFT) of dark energy (DE) for the k-essence model beyond linear order. Using particle-mesh N-body simulations that consistently solve the DE evolution on a grid, we find ...
  • Asevolution: a relativistic N-body implementation of the (a)symmetron 
    Christiansen, Øyvind; Hassani, Farbod; Jalilvand, Mona; Mota, David (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
    We present asevolution, a cosmological N-body code developed based on gevolution, which consistently solves for the (a)symmetron scalar field and metric potentials within the weak-field approximation. In asevolution, the ...
  • Biased tracers as a probe of beyond-ΛCDM cosmologies 
    Hassani, Farbod; Adamek, Julian; Durrer, Ruth; Kunz, Martin (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
    Cosmological models beyond ΛCDM, such as those featuring massive neutrinos or modifications of gravity, often display a characteristic change (scale-dependent suppression or enhancement) in the matter power spectrum when ...
  • Clustering of dark matter in the cosmic web as a probe of massive neutrinos 
    Khoshtinat, Mohadese; Ansarifard, Mohammad; Hassani, Farbod; Baghram, Shant (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2024)
    The large-scale structure of the Universe is distributed in a cosmic web. Studying the distribution and clustering of dark matter particles and haloes may open up a new horizon for studying the physics of the dark Universe. ...
  • Clusternets: a deep learning approach to probe clustering dark energy 
    Chegeni, Amirmohammad; Hassani, Farbod; Vafaei Sadr, Alireza; Khosravi, Nima; Kunz, Martin (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2024)
  • Euclid: modelling massive neutrinos in cosmology - a code comparison 
    Adamek, J.; Angulo, R. E.; Arnold, C.; Baldi, Marco; Biagetti, M.; Bose, B.; Carbone, C.; Castro, T.; Dakin, J.; Dolag, K.; Elbers, W.; Fidler, C.; Giocoli, C.; Hannestad, Steen; Hassani, Farbod; Hernández-Aguayo, César; Koyama, K.; Li, B.; Mauland-Hus, Renate; Monaco, P.; Moretti, C.; Mota, David; Partmann, C.; Parimbelli, G.; Potter, D.; Schneider, A.; Schulz, S.; Smith, R.E.; Springel, Volker; Stadel, J.; Tram, T.; Viel, Matteo; Villaescuso-Navarro, F.; Winther, Hans Arnold; Wright, B.S.; Zennaro, M.; Aghanim, Nabila; Amendola, Luca; Auricchio, N.; Bonino, D.; Branchini, E.; Brescia, M.; Camera, S.; Capobianco, V.; Cardone, V. F.; Carretero, J.; Castander, Francisco Javier; Castellano, M.; Cavuoti, S.; Cimatti, Andrea; Clédassou, Rodolphe; Congedo, G.; Conversi, L.; Copin, Y.; Da Silva, A.; Degaudenzi, H.; Douspis, M.; Dubath, F.; Duncan, C.A.J.; Dupac, X.; Dusini, S.; Farrens, S.; Ferriol, S.; Fosalba, P.; Frailis, M.; Franceschi, E.; Galeotta, S.; Garilli, B.; Gillard, W.; Gillis, B.; Grazian, A.; Haugan, Stein Vidar Hagfors; Holmes, W.; Hornstrup, Allan; Jahnke, Knud; Kermiche, S.; Kiessling, A.; Kilbinger, M.; Kitching, T.; Kunz, Martin; Kurki-Suonio, Hannu; Lilje, Per Barth; Lloro, I.; Mansutti, O.; Marggraf, O.; Marulli, F.; Massey, R.; Medinaceli, E.; Meneghetti, M.; Munari, E.; Niemi, S.-M.; Padilla, C.; Paltani, S.; Pasian, F.; Pedersen, Kristian; Percival, Will J.; Pettorino, V.; Polenta, G.; Poncet, M.; Popa, L.A.; Raison, F.; Rebolo, Rafael; Renzi, A.; Rhodes, Jason D.; Riccio, G.; Romelli, E.; Roncarelli, M.; Saglia, R.; Sapone, D.; Sartoris, B.; Schneider, Peter; Schrabback, T.; Secroun, A.; Seidel, G.; Sirignano, C.; Sirri, G.; Stanco, L.; Starck, J.-L.; Tallada-Crespí, P.; Taylor, A. N.; Tereno, I.; Toledo-Moreo, R.; Torradeflot, F.; Tutusaus, I.; Valenziano, L.; Vassallo, T.; Wang, Y.; Weller, Jochen; Zacchei, Andrea; Zamorani, G.; Zoubian, J.; Fabbian, G.; Scottez, V. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
    The measurement of the absolute neutrino mass scale from cosmological large-scale clustering data is one of the key science goals of the Euclid mission. Such a measurement relies on precise modelling of the impact of ...
  • Instabilities appearing in cosmological effective field theories: when and how? 
    Eckmann, Jean-Pierre; Hassani, Farbod; Zaag, Hatem (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
  • New nonlinear instability for scalar fields 
    Hassani, Farbod; Shi, Pan; Adamek, Julian; Kunz, Martin; Wittwer, Peter (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
    In this Letter, we introduce the nonlinear partial differential equation ∂2τπ∝(→∇π)2 showing a new type of instability. Such equations appear in the effective field theory (EFT) of dark energy for the k-essence model as ...
  • Structure of cosmic web in non-linear regime: the nearest neighbour and spherical contact distributions 
    Fard, Mohammad Ansari; Baghkhani, Zahra; Ghodsi, Laya; Taamoli, Sina; Hassani, Farbod; Baghram, Shant (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
    ABSTRACT In non-linear scales, the matter density distribution is not Gaussian. Consequently, the widely used two-point correlation function is not adequate anymore to capture the matter density field’s entire ...