Browsing Institutt for teoretisk astrofysikk by Author "Vagnozzi, Sunny"

Now showing items 1-6 of 6

  • Black holes with scalar hair in light of the Event Horizon Telescope 
    Khodadi, Mohsen; Allahyari, Alireza; Vagnozzi, Sunny; Mota, David (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2020)
    Searching for violations of the no-hair theorem (NHT) is a powerful way to test gravity, and more generally fundamental physics, particularly with regards to the existence of additional scalar fields. The first observation ...
  • Cosmological direct detection of dark energy: Non-linear structure formation signatures of dark energy scattering with visible matter 
    Ferlito, Fulvio; Vagnozzi, Sunny; Mota, David; Baldi, Marco (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
    Abstract We consider the recently proposed possibility that dark energy (DE) and baryons may scatter through a pure momentum exchange process, leaving the background evolution unaffected. Earlier work has shown ...
  • Dawn of the dark: unified dark sectors and the EDGES Cosmic Dawn 21-cm signal 
    Yang, Weiqiang; Pan, Supriya; Vagnozzi, Sunny; Di Valentino, Eleonora; Mota, David; Capozziello, Salvatore (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2019)
    While the origin and composition of dark matter and dark energy remains unknown, it is possible that they might represent two manifestations of a single entity, as occurring in unified dark sector models. On the other hand, ...
  • Do we have any hope of detecting scattering between dark energy and baryons through cosmology? 
    Vagnozzi, Sunny; Visinelli, Luca; Mena, Olga; Mota, David (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
    We consider the possibility that dark energy and baryons might scatter off each other. The type of interaction we consider leads to a pure momentum exchange, and does not affect the background evolution of the expansion ...
  • Listening to the sound of dark sector interactions with gravitational wave standard sirens 
    Yang, Weiqiang; Vagnozzi, Sunny; Di Valentino, Eleonora; Nunes, Rafael C.; Pan, Supriya; Mota, David (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2019)
    We consider two stable Interacting Dark Matter-Dark Energy models and confront them against current Cosmic Microwave Background data from the Planck satellite. We then generate luminosity distance measurements from Script ...
  • Magnetically charged black holes from non-linear electrodynamics and the Event Horizon Telescope 
    Allahyari, Alireza; Khodali, Mohsen; Vagnozzi, Sunny; Mota, David (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2020)
    Non-linear electrodynamics (NLED) theories are well-motivated extensions of QED in the strong field regime, and have long been studied in the search for regular black hole (BH) solutions. We consider two well-studied and ...