Extended Cuscuton: Formulation and Cosmology

Among single-field scalar-tensor theories, there is a special class called "cuscuton,"
which is represented as general relativity with a noncanonical scalar field. This theory
has a remarkable feature that scalar perturbations do not propagate on a cosmological
background. We specify a subclass of the (beyond) Horndeski class having this
property and thus extend the framework of cuscuton. We also discuss the stability of
cosmological perturbations in the extended cuscuton models.


Mardi, 10 juillet, 2018 - 14:00

Salle / Local: 

483 A - Malevitch

Nom/Prénom // Last name/First name: 

Kazufumi Takahashi



Equipe(s) organisatrice(s) / Organizing team(s): 

  • Théorie