Blar i Vitenskapelige publikasjoner (IMF) på tittel

Viser treff 173-179 av 179

    • Universal Black Holes 

      Hervik, Sigbjørn; Ortaggio, Marcello (Peer reviewed; Journal article, 2020-02)
      We prove that a generalized Schwarzschild-like ansatz can be consistently employed to construct d-dimensional static vacuum black hole solutions in any metric theory of gravity for which the Lagrangian is a scalar invariant ...

    • Universal p-form black holes in generalized theories of gravity 

      Hervik, Sigbjørn; Ortaggio, Marcello (Peer reviewed; Journal article, 2020-10)
      We explore how far one can go in constructing d-dimensional static black holes coupled to p-form and scalar fields before actually specifying the gravity and electrodynamics theory one wants to solve. At the same time, we ...

    • Universal spacetimes in four dimensions 

      Hervik, Sigbjørn; Pravda, Vojtech; Pravdova, Alena (Journal article; Peer reviewed, 2017-10)
      Universal spacetimes are exact solutions to all higher-order theories of gravity. We study these spacetimes in four dimensions and provide necessary and sufficient conditions for universality for all Petrov types except ...

    • Unveiling the gravitational universe at μ-Hz frequencies 

      Sesana, Alberto; Korsakova, Natalia; Sedda, Manuel Arca; Baibhav, Vishal; Barausse, Enrico; Barke, Simon; Berti, Emanuele; Bonetti, Matteo; Capelo, Pedro R.; Caprini, Chiara; Garcia-Bellido, Juan; Haiman, Zoltan; Jani, Karan; Jennrich, Oliver; Johansson, Peter H.; Khan, Fazeel Mahmood; Korol, Valeriya; Lamberts, Astrid; Lupi, Alessandro; Mangiagli, Alberto; Mayer, Lucio; Nardini, Germano; Pacucci, Fabio; Petiteau, Antoine; Raccanelli, Alvise; Rajendran, Surjeet; Regan, John; Shao, Lijing; Spallicci, Alessandro; Tamanini, Nicola; Volonteri, Marta; Warburton, Niels; Wong, Kaze; Zumalacárregui, Miguel (Peer reviewed; Journal article, 2021)
      We propose a space-based interferometer surveying the gravitational wave (GW) sky in the milli-Hz to μ-Hz frequency range. By the 2040s, the μ-Hz frequency band, bracketed in between the Laser Interferometer Space Antenna ...

    • Value regions of univalent self-maps with two boundary fixed points 

      Gumenyuk, Pavel; Prokhorov, Dmitri (Journal article; Peer reviewed, 2018)
      In this paper we find the exact value region V(z0,T) of the point evaluation functional f → f(z0) over the class of all holomorphic injective self-maps f : D → D of the unit disk D having a boundary regular fixed point at ...

    • Wick-rotations of pseudo-Riemannian Lie groups 

      Helleland, Christer (Peer reviewed; Journal article, 2020)
      We study Wick-rotations of left-invariant metrics on Lie groups, using results from real GIT (Helleland and Hervik, 2018; Helleland and Hervik, 2019). An invariant for Wick-rotation of Lie groups is given, and we describe ...

    • X‐ray and Synchrotron FTIR Studies of Partially Decomposed Magnesium Borohydride 

      Dahal, Rashmi; Vitillo, Jenny G.; Åsland, Anna Cecilie; Frommen, Christoph; Deledda, Stefano; Zavorotynska, Olena (Peer reviewed; Journal article, 2022)
      Magnesium borohydride (Mg(BH4)2) is an attractive compound for solid-state hydrogen storage due to its lucratively high hydrogen densities and theoretically low operational temperature. Hydrogen release from Mg(BH4)2 occurs ...