Sökning: "bimetric theory"
Hittade 4 uppsatser innehållade orden bimetric theory.
1. Gravitational Waves in Bimetric Gravity
Master-uppsats, Uppsala universitet/Institutionen för fysik och astronomiSammanfattning : 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. LÄS MER
2. An Analysis of Theories of Multiple Spin-2 Fields
Master-uppsats, Stockholms universitet/FysikumSammanfattning : 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]. LÄS MER
3. On the consistency of multigravity theories
Master-uppsats, Stockholms universitet/FysikumSammanfattning : 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
4. 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)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