Browsing by Author "Papallo, Giuseppe"
Now showing items 1-4 of 4
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Graviton time delay and a speed limit for small black holes in Einstein-Gauss-Bonnet theory
Papallo, Giuseppe; Reall, Harvey Stephen (SpringerJournal of High Energy Physics, 2015-11-17)Camanho, Edelstein, Maldacena and Zhiboedov have shown that gravitons can experience a negative Shapiro time delay, i.e. a time advance, in Einstein-Gauss-Bonnet theory. They studied gravitons propagating in singular ...
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Graviton time delay and a speed limit for small black holes in Einstein-Gauss-Bonnet theory
Papallo, Giuseppe; Reall, Harvey Stephen (Journal of High Energy Physics, 2015-11-17)
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On the hyperbolicity of the most general Horndeski theory
Papallo, Giuseppe (American Physical SocietyPHYSICAL REVIEW D, 2017-12-27)In this paper we study the hyperbolicity of the equations of motion for the most general Horndeski theory of gravity in a generic "weak field" background. We first show that a special case of this theory, namely Einstein ...
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On the local well-posedness of Lovelock and Horndeski theories
Papallo, Giuseppe; Reall, Harvey Stephen (American Physical SocietyPhysical Review D - Particles, Fields, Gravitation and Cosmologyhttp://dx.doi.org/10.1103/PhysRevD.96.044019, 2017-08-15)We investigate local well-posedness of the initial value problem for Lovelock and Horndeski theories of gravity. A necessary condition for local well-posedness is strong hyperbolicity of the equations of motion. Even weak ...