Sökning: "bigravity"

Hittade 2 uppsatser innehållade ordet bigravity.

1. 1. On the consistency of multigravity theories

   Master-uppsats, Stockholms universitet/Fysikum

   Författare :Marcus Högås; [2016]
   Nyckelord :Gravity; Modified theories for gravity; Bimetric gravity; Multimetric gravity; Bigravity; Multigravity; Consistency; Deser-van Nieuwenhuizen condition; Symmetric vielbein condition; Symmetrization condition;

   Sammanfattning : In this thesis a set of recently proposed multigravity theories is analysed. In the special case of bimetric gravity, the theory has been conclusively shown to be ghost-free. On the other hand, for multigravity theories in general, the ghost-issue has not been settled conclusively. LÄS MER

3. 2. The Square-Root Isometry of Coupled Quadratic Spaces : On the relation between vielbein and metric formulations of spin-2 interactions

   Master-uppsats, Stockholms universitet/Fysikum; Stockholms universitet/Oskar Klein-centrum för kosmopartikelfysik (OKC)

   Författare :Kocic Mikica B.; [2014]
   Nyckelord :modified gravity; bigravity; bimetric theory; square-root isometry;

   Sammanfattning : Bimetric theory is an extension to general relativity that introduces a secondary symmetric rank-two tensor field. This secondary spin-2 field is also dynamical, and to avoid the Boulware-Deser ghost issue, the interaction between the two fields is obtained through a potential that involes the matrix square-root of the tensors. LÄS MER