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

Now showing items 1-20 of 81

  • 4D Gauss–Bonnet gravity: Cosmological constraints, H0 tension and large scale structure 
    Wang, Deng; Mota, David (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2021)
  • Accelerating universe in modified teleparallel gravity theory 
    Sahlu, Shambel; Ntahompagaze, Joseph; Abebe, Amare; Mota, David (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2019)
    Abstract This paper studies the cosmology of accelerating expansion of the universe in modified teleparallel gravity theory. We discuss the cosmology of f ( T, B ) gravity theory and its implication to the new general form ...
  • 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 ...
  • 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 ...
  • Breaking cosmic degeneracies: Disentangling neutrinos and modified gravity with kinematic information 
    Hagstotz, Steffen; Gronke, Max Balthasar; Mota, David; Baldi, Marco (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2019)
    Searches for modified gravity in the large-scale structure try to detect the enhanced amplitude of density fluctuations caused by the fifth force present in many of these theories. Neutrinos, on the other hand, suppress ...
  • Breaking the Vainshtein screening in clusters of galaxies 
    Salzano, Vincenzo; Mota, David; Capoziello, S.; Donahue, Megan (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2017)
    © 2017 American Physical Society
  • Can f(T) gravity resolve the H0 tension? 
    Wang, Deng; Mota, David (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
    Motivated by the discrepancy in measurements of H0 between local and global probes, we investigate whether teleparallel gravities could be a better model to describe the present-day observations or at least to alleviate ...
  • Characteristic Features of Gravitational Wave Lensing as Probe of Lens Mass Model 
    Cremonese, Paolo; Mota, David; Salzano, Vincenzo (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
    Abstract To recognize gravitational wave lensing events and being able to differentiate between similar lens models will be of crucial importance once one will be observing several lensing events of gravitational waves per ...
  • Charged black hole mergers: Orbit circularisation and chirp mass bias 
    Christiansen, Øyvind; Jiménez, Jose Beltrán; Mota, David (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2021)
    We consider the inspiral of black holes carrying U(1) charge that is not electromagnetic, but corresponds to some dark sector. In the weak-field, low-velocity regime, the components follow Keplerian orbits. We investigate ...
  • Collapse of spherical overdensities in superfluid models of dark matter 
    Hartman, Stian; Winther, Hans Arnold; Mota, David (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
    Aims. We intend to understand cosmological structure formation within the framework of superfluid models of dark matter with finite temperatures. Of particular interest is the evolution of small-scale structures where the ...
  • Consistency relations for large-scale structures: Applications for the integrated Sachs-Wolfe effect and the kinematic Sunyaev-Zeldovich effect 
    Rizzo, Luca Alberto; Mota, David; Valageas, Patrick (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2017)
    Consistency relations of large-scale structures provide exact nonperturbative results for cross-correlations of cosmic fields in the squeezed limit. They only depend on the equivalence principle and the assumption of ...
  • Constraints to Dark Energy Using PADE Parameterizations 
    Rezaei, M.; Malekjani, M.; Basilakos, S.; Mehrabi, A.; Mota, David (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2017)
    © 2017. The American Astronomical Society. All rights reserved.
  • Cosmic microwave background anomalies from imperfect energy: Confrontation with the data 
    Axelsson, Magnus; Hansen, Frode Kristian; Koivisto, Tomi Sebastian; Mota, David (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2014)
    We test anisotropic dark energy models with the 7-year WMAP temperature observation data. In the presence of imperfect sources, large-scale gradients or anisotropies in the dark energy mean that the CMB sky will be distorted ...
  • Cosmic tsunamis in modified gravity: disruption of screening mechanisms from scalar waves 
    Hagala, Robert; Llinares, Claudio; Mota, David (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2017)
    Extending general relativity by adding extra degrees of freedom is a popular approach for explaining the accelerated expansion of the Universe and to build high energy completions of the theory of gravity. The presence of ...
  • Cosmic voids in modified gravity scenario 
    Duarte Perico, Eder Leonardo; Voivodic, Rodrigo; Lima, Marcos; Mota, David (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2019)
    Modified gravity (MG) theories aim to reproduce the observed acceleration of the Universe by reducing the dark sector while simultaneously recovering General Relativity (GR) within dense environments. Void studies appear ...
  • 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 ...
  • Cosmological simulations of screened modified gravity out of the static approximation: Effects on matter distribution 
    Llinares, Claudio; Mota, David (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2014)
    In the context of scalar tensor theories for gravity, there is a universally adopted hypothesis when running N-body simulations that time derivatives in the equation of motion for the scalar field are negligible. In this ...
  • Cosmological simulations of self-interacting Bose-Einstein condensate dark matter 
    Hartman, Stian Thomas Heimdal; Winther, Hans Arnold; Mota, David (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
    Fully 3D cosmological simulations of scalar field dark matter with self-interactions, also known as Bose-Einstein condensate dark matter, are performed using a set of effective hydrodynamic equations. These are derived ...
  • Cosmological simulations with hydrodynamics of screened scalar-tensor gravity with non-universal coupling 
    Hammami, Amir; Mota, David (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2015)
    Aims: We study the effects of letting dark matter and gas in the Universe couple to the scalar field of the symmetron model, a modified gravity theory, with varying coupling strength. We also search for a way to distinguish ...
  • Cosmology and fundamental physics with the Euclid satellite 
    Amendola, Luca; Appleby, Stephen; Avgoustidis, Anastasios; Bacon, David; Baker, Tessa; Baldi, Marco; Bartolo, Nicola; Blanchard, Alain; Bonvin, Camille; Borgani, Stefano; Branchini, Enzo; Burrage, Clare; Camera, Stefano; Carbone, Carmelita; Casarini, Luciano; Cropper, Mark; de Rham, Claudia; Dietrich, Jörg P.; Di Porto, Cinzia; Durrer, Ruth; Ealet, Anne; Ferreira, Pedro G.; Finelli, Fabio; García-Bellido, Juan; Giannantonio, Tommaso; Guzzo, Luigi; Heavens, Alan; Heisenberg, Lavinia; Heymans, Catherine; Hoekstra, Henk; Hollenstein, Lukas; Holmes, Rory; Hwang, Zhiqi; Jahnke, Knud; Kitching, Thomas D.; Koivisto, Tomi; Kunz, Martin; La Vacca, Giuseppe; Linder, Eric; March, Marisa; Marra, Valerio; Martins, Carlos; Majerotto, Elisabetta; Markovic, Dida; Marsh, David; Marulli, Federico; Massey, Richard; Mellier, Yannick; Montanari, Francesco; Mota, David; Nunes, Nelson J.; Percival, Will; Pettorino, Valeria; Porciani, Cristiano; Quercellini, Claudia; Read, Justin; Rinaldi, Massimiliano; Sapone, Domenico; Sawicki, Ignacy; Scaramella, Roberto; Skordis, Constantinos; Simpson, Fergus; Taylor, Andy; Thomas, Shaun; Trotta, Roberto; Verde, Licia; Vernizzi, Filippo; Vollmer, Adrian; Wang, Yun; Weller, Jochen; Zlosnik, Tom (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2018)
    Euclid is a European Space Agency medium-class mission selected for launch in 2020 within the cosmic vision 2015–2025 program. The main goal of Euclid is to understand the origin of the accelerated expansion of the universe. ...