Essays about: "bimetric theory"

Found 4 essays containing the words bimetric theory.

  1. 1. Gravitational Waves in Bimetric Gravity

    University essay from Uppsala universitet/Institutionen för fysik och astronomi

    Author : Erik Schildt; [2022]
    Keywords : ;

    Abstract : Understanding the cause of the accelerated expansion of the Universe is one of the most pressing issues in modern cosmology. An alternative to the LambdaCDM-model is bimetric gravity which is an extension of Einstein's theory of general relativity. READ MORE

  3. 2. An Analysis of Theories of Multiple Spin-2 Fields

    University essay from Stockholms universitet/Fysikum

    Author : Joakim Flinckman; [2020]
    Keywords : ;

    Abstract : Until recently, no consistent theory of more than two interacting spin-2 fields was known, except for a collection of pairwise bimetric couplings. In 2018, Hassan and Schmidt-May presented a theory with couplings beyond pairwise for an arbitrary number of fields in terms of vielbeins [1]. READ MORE

  4. 3. On the consistency of multigravity theories

    University essay from Stockholms universitet/Fysikum

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

    Abstract : 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. READ MORE

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

    University essay from Stockholms universitet/Fysikum; Stockholms universitet/Oskar Klein-centrum för kosmopartikelfysik (OKC)

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

    Abstract : 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. READ MORE