Browsing Institutt for teoretisk astrofysikk by Author "Mota, David"

Now showing items 41-60 of 81

  • Growth of linear perturbations in a universe with superfluid dark matter 
    Banerjee, Shreya; Bera, Sayantani; Mota, David (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2020)
    The Lambda-Cold Dark Matter (ΛCDM) model agrees with most of the cosmological observations, but has some hindrances from observed data at smaller scales such as galaxies. Recently, Berezhiani and Khoury proposed a new ...
  • Growth of linear perturbations in a universe with superfluid dark matter 
    Banerjee, S.; Bera, S.; Mota, David (Chapter / Bokkapittel / PublishedVersion; Peer reviewed, 2023)
    The Lambda-Cold Dark Matter (ΛCDM) model agrees with most of the cosmological observations, but has some hindrances from observed data at smaller scales such as galaxies. Recently, Berezhiani and Khoury proposed a new ...
  • Halo collapse: virialization by shear and rotation in dynamical dark-energy models. Effects on weak-lensing peaks 
    Pace, Francesco; Schimd, Carlo; Mota, David; Del Popolo, Antonino (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2019)
    The evolution of the virial overdensity Δvir for ΛCDM and seven dynamical dark-energy models is investigated in the extended spherical collapse model (SCM). Here the virialization process is naturally achieved by introducing ...
  • Halo velocity profiles in screened modified gravity theories 
    Grönke, Max Balthasar; Llinares, Claudio; Mota, David; Winther, Hans Arnold (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2015)
    Screened modified gravity predicts potentially large signatures in the peculiar velocity field that makes it an interesting probe to test gravity on cosmological scales. We investigate the signatures induced by the Symmetron ...
  • High angular resolution gravitational wave astronomy 
    Baker, John; Baker, Tessa; Carbone, Carmelita; Congedo, Giuseppe; Contaldi, Carlo R.; Dvorkin, Irina; Gair, Jonathan; Haiman, Zoltan; Mota, David; Renzini, Arianna; Buis, Ernst-Jan; Cusin, Giulia; Ezquiaga, Jose M.; Mueller, Guido; Pieroni, Mauro; Quenby, John; Ricciardone, Angelo; Saltas, Ippocratis D.; Shau, Lijing; Tamanini, Nicola; Tasinato, Gianmassimo; Zumalacárregui, Miguel (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
    Abstract Since the very beginning of astronomy the location of objects on the sky has been a fundamental observational quantity that has been taken for granted. While precise two dimensional positional information is easy ...
  • Hydrodynamic effects in the symmetron and f(R)-gravity models 
    Hammami, Amir; Llinares, Claudio; Mota, David; Winther, Hans Arnold (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2015)
    In this paper, we present the first results from implementing two scalar–tensor modified gravity theories, the symmetron and the Hu–Sawicki f(R)-gravity model, into a hydrodynamic N-body code with dark matter particles and ...
  • In the realm of the Hubble tension—a review of solutions 
    Di Valentino, Eleonora; Mena, Olga; Pan, Supriya; Visinelli, Luca; Yang, Weiqiang; Melchiorri, Alessandro; Mota, David; Riess, Adam G.; Silk, Joseph (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
     The simplest ΛCDM model provides a good fit to a large span of cosmological data but harbors large areas of phenomenology and ignorance. With the improvement of the number and the accuracy of observations, discrepancies ...
  • ISIS: a new N-body cosmological code with scalar fields based on RAMSES - Code presentation and application to the shapes of clusters 
    Llinares, Claudio; Mota, David; Winther, Hans Arnold (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2014)
    Several extensions of the standard cosmological model include scalar fields as new degrees of freedom in the underlying gravitational theory. A particular class of these scalar field theories include screening mechanisms ...
  • IWDM: the fate of an interacting non-cold dark matter — vacuum scenario 
    Pan, Supriya; Yang, Weiqiang; Di Valentino, Eleonora; Mota, David; Silk, Joseph (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
    Abstract In most cosmological models, the equation of state of the dark matter is assumed to be zero, which means that the dark matter is pressure-less or cold. While this hypothesis is based on the abundance of ...
  • 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 ...
  • Local observables in a landscape of infrared gauge modes 
    Thorsrud, Mikjel; Mota, David; Urban, Federico (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2014)
    Cosmological local observables are at best statistically determined by the fundamental theory describing inflation. When the scalar inflaton is coupled uniformly to a collection of subdominant massless gauge vectors, ...
  • 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 ...
  • Mass-temperature relation in ΛCDM and modified gravity 
    Del Popolo, Antonino; Pace, Francesco; Mota, David (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2019)
    We derive the mass-temperature relation using an improved top-hat model and a continuous formation model which takes into account the effects of the ordered angular momentum acquired through tidal-torque interaction between ...
  • Modeling void abundance in modified gravity 
    Voivodic, Rodrigo; Lima, Marcos; Llinares, Claudio; Mota, David (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2017)
    © 2017 American Physical Society
  • N-BODY SIMULATIONS FOR EXTENDED QUINTESSENCE MODELS 
    Li, Baojiu; Mota, David; Barrow, J. D. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2011)
    We introduce the N-body simulation technique to follow structure formation in linear and nonlinear regimes for the extended quintessence models (scalar-tensor theories in which the scalar field has a self-interaction ...
  • No slip gravity in light of LISA standard sirens 
    Allahyari, Alireza; Nunes, Rafael C.; Mota, David (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
    ABSTRACT Standard sirens (SS) are the gravitational wave analogue of the astronomical standard candles, and can provide powerful information about the dynamics of the Universe up to very high z values. In this ...
  • No-hair theorem in the wake of Event Horizon Telescope 
    Khodadi, Mohsen; Lambiase, Gaetano; Mota, David (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2021)
    Thanks to the release of the extraordinary EHT image of shadow attributed to the M87* supermassive black hole (SMBH), we have a novel window to assess the validity of fundamental physics in the strong-field regime. Motivated ...
  • Non-linear dynamics of the minimal theory of massive gravity 
    Hagala, Robert; De Felice, Antonio; Mota, David; Mukohyama, Shinji (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
    We investigate cosmological signatures of the minimal theory of massive gravity (MTMG). To this aim, we simulate the normal branch of the MTMG by employing the R AMSES N -body code and extending it with an effective ...
  • Non-linear phenomenology of disformally coupled quintessence 
    Llinares, Claudio; Hagala, Robert; Mota, David (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2019)
    The quintessence model is one of the simplest and better known alternatives to Einstein’s theory for gravity. The properties of the solutions have been studied in great detail in the background, linear and non-linear ...
  • Novel approach toward the large-scale stable interacting dark-energy models and their astronomical bounds 
    Yang, Weiqiang; Pan, Supriya; Mota, David (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2017)
    © 2017 American Physical Society