Well-tempered teleparallel Horndeski cosmology: a teleparallel variation to the cosmological constant problem

RC Bernardo, JL Said, M Caruana… - Journal of Cosmology …, 2021 - iopscience.iop.org
Well-tempering is a promising classical method of dynamically screening an arbitrarily large
vacuum energy and generating a late-time, low energy de Sitter vacuum state. In this paper …

Well-tempered Minkowski solutions in teleparallel Horndeski theory

RC Bernardo, JL Said, M Caruana… - Classical and Quantum …, 2021 - iopscience.iop.org
Well-tempering stands among the few classical methods of screening vacuum energy to
deliver a late-time, low energy vacuum state. We build on the class of Horndeski models that …

A minimal self-tuning model to solve the cosmological constant problem

A Khan, A Taylor - Journal of Cosmology and Astroparticle …, 2022 - iopscience.iop.org
The expansion of the Universe is observed to be accelerating, with the simplest solution
being a classical cosmological constant. However, this receives contributions from the …

Phantom attractors in kinetic gravity braiding theories: a dynamical system approach

TB Vasilev, M Bouhmadi-López… - Journal of Cosmology …, 2023 - iopscience.iop.org
We revise the expansion history of the scalar field theories known as Kinetic Gravity
Braiding. These theories are well-known for the possibility of driving the expansion of the …

Tadpole cosmology: Milne solution as a cosmological constant hideout

S Appleby, RC Bernardo - Journal of Cosmology and …, 2023 - iopscience.iop.org
Dynamical cancellation frameworks present a potential means of mitigating the effect of a
large vacuum energy, that would otherwise ruin the late-time, low energy dynamics of the …

[HTML][HTML] Big rip in shift-symmetric Kinetic Gravity Braiding theories

TB Vasilev, M Bouhmadi-López, P Martín-Moruno - Physics Letters B, 2023 - Elsevier
We revise the future fate of a group of scalar-tensor theories known as kinetic gravity
braiding models. As it is well-known, these theories can safely drive the expansion of the …

Tadpole cosmology: self tuning without degeneracy

S Appleby, RC Bernardo - Journal of Cosmology and …, 2022 - iopscience.iop.org
Degeneracy is a method to accommodate exact, low energy vacuum states in scalar-tensor
gravitational models despite the presence of an arbitrarily large vacuum energy. However …

Dark energy with a shift-symmetric scalar field: obstacles, loophole hunting and dead ends

TB Vasilev, M Bouhmadi-López… - arXiv preprint arXiv …, 2024 - arxiv.org
We discuss the possibility of a scalar field being the fundamental description of dark energy
without the need of self-tuning any parameter. Thereby, we focus on shift-symmetric scalar …

Well Tempered Cosmology: Scales

EV Linder - arXiv preprint arXiv:2201.02211, 2022 - arxiv.org
Well tempered cosmology provides a well defined path for obtaining cosmology with a low
energy cosmic acceleration despite a high (Planck) energy cosmological constant $\Lambda …

The nonlinear anisotropic model of the Universe with the linear potential

RK Muharlyamov, TN Pankratyeva - Indian Journal of Physics, 2023 - Springer
In the Bianchi I cosmology some subclasses of the Horndeski theory allow for the non-
standard anisotropy behavior. For example, the anisotropy is damped near the initial …