WebMay 3, 2024 · Abstract. Ghost-free bimetric gravity is an extension of general relativity, featuring a massive spin-2 field coupled to gravity. We parameterize the theory with a set of observables having specific physical interpretations. WebWe introduce special class of bimetric theories of quantized fields with preserved …
Bimetric gravity is cosmologically viable - ScienceDirect
WebIntroduction to Bimetric Theory We begin this chapter by recalling some ideas from General Relativity(GR). We then introduce a linear theory of massive gravity, the Fierz-Pauli theory and explain issues faced by it and similar theories before introducing the ghost free bimetric theory which was rst introduced by Hassan and Rosen in 2011 [1] [2]. WebDec 14, 2024 · At MIT, Almasri’s research and coursework focuses on two areas that relate directly to his activist vision: social movements and authoritarian regimes. “I’m specifically interested in opposition groups,” he says. “Social movements rise and die, rise and die, over time, and opposition groups are more or less consistent over time.” fishers ghost art award 2021
Mohammad Walid AlMasri arXiv:2012.15600v2 [hep-th] 10 Jan 2024
WebNov 10, 2024 · We present a bimetric low-energy effective theory of fractional quantum Hall (FQH) states that describes the topological properties and a gapped collective excitation, known as the Girvin-Macdonald-Platzman (GMP) mode. The theory consists of a topological Chern-Simons action, coupled to a symmetric rank-2 tensor, and an action à … WebMay 17, 2013 · A bstract. We consider the issues that arise out of interpreting the ghost-free bimetric theory as a theory of a spin-2 field coupled to gravity. This requires identifying a gravitational metric and parameterizing deviations of the resulting theory from general relativity. To this end, we first consider the most general bimetric backgrounds for ... WebMar 6, 2024 · Bimetric theory describes a massless and a massive spin-2 field with fully non-linear (self-)interactions. It has a rich phenomenology and has been successfully tested with several data sets. However, the observational constraints have not been combined in a consistent framework, yet. fishers ghost art prize 2022