3 papers
gr-qc2026
Finite time pseudo-rip singularity in cosmology
Mariusz P. DÄ browski, Teodor Borislavov Vasilev
By studying first a new decelerating sudden future singularity (SFS) universe we report finding a novel type of cosmological singularity which we dub a finite time pseudo-rip (FTPR…
gr-qc2026
K-nonizing
Jose Beltrán Jiménez, Teodor Borislavov Vasilev, DarÃo Jaramillo-Garrido +2
We unveil the dynamical equivalence of field theories with non-canonical kinetic terms and canonical theories with a volume element invariant under transverse diffeomorphisms. The…
gr-qc2024
Dark energy with a shift-symmetric scalar field: obstacles, loophole hunting and dead ends
Teodor Borislavov Vasilev, Mariam Bouhmadi-López, Prado MartÃn-Moruno
We discuss the possibility of a scalar field being the fundamental description of dark energy. We focus on shift-symmetric scalar-tensor theories since this symmetry potentially av…