299 citations · 484 across the 13 of their papers we have counts for
13 papers
Non-minimal fluid Lagrangian couplings
Christian G. Boehmer, Erik Jensko, Eissa Al-Nasrallah
Gravitational models with non-minimal couplings involving functions of the matter Lagrangian and curvature have become popular in recent decades. By coupling the matter Lagrangian…
Interacting dark sector from intrinsic entropy couplings
Erik Jensko, Elsa M. Teixeira, Vivian Poulin
We introduce a new class of interacting dark sector models that couple the intrinsic entropy of dark matter to scalar field dark energy. Using the Lagrangian formulation for relati…
Cosmological dynamical systems of non-minimally coupled fluids and scalar fields
Hala A. Ashi, Christian G. Boehmer, Antonio d'Alfonso del Sordo +1
We study the cosmological dynamics of non-minimally coupled matter models using the Brown's variational approach to relativistic fluids in General Relativity. After decomposing the…
Geometric formulation of -essence and late-time acceleration
Lehel Csillag, Erik Jensko
We study a class of geometries in which nonmetricity is fully determined by a vectorial degree of freedom and three independent coefficients. Formulating the simplest linear action…
The CosmoVerse White Paper: Addressing observational tensions in cosmology with systematics and fundamental physics
Eleonora Di Valentino, Jackson Levi Said, Adam Riess +533
The standard model of cosmology has provided a good phenomenological description of a wide range of observations both at astrophysical and cosmological scales for several decades.…
Spatial curvature in coincident gauge cosmology
Erik Jensko
In this work we study the Friedmann-Lemaître-Robertson-Walker cosmologies with arbitrary spatial curvature for the symmetric teleparallel theories of gravity, giving the first pres…
Relativistic interacting fluids in cosmology
Damianos Iosifidis, Erik Jensko, Tomi S. Koivisto
Motivated by cosmological applications for interacting matters, an extension of the action functional for relativistic fluids is proposed to incorporate the physics of non-adiabati…
A Unified Approach to Geometric Modifications of Gravity
Erik Jensko
This thesis studies modified theories of gravity from a geometric viewpoint. We review the motivations for considering alternatives to General Relativity and cover the mathematical…
A new 2D formulation of modified General Relativity
Christian G. Boehmer, Erik Jensko
It is well known that the Einstein-Hilbert action in two dimensions is topological and yields an identically vanishing Einstein tensor. Consequently one is faced with difficulties…
Dynamical systems analysis of gravity
Christian G. Boehmer, Erik Jensko, Ruth Lazkoz
Modified gravity theories can be used for the description of homogeneous and isotropic cosmological models through the corresponding field equations. These can be cast into systems…
Modified gravity: a unified approach to metric-affine models
Christian G. Boehmer, Erik Jensko
The starting point of this work is the original Einstein action, sometimes called the Gamma squared action. Continuing from our previous results, we study various modified theories…
Cosmological dynamical systems in modified gravity
Christian G. Boehmer, Erik Jensko, Ruth Lazkoz
The field equations of modified gravity theories, when considering a homogeneous and isotropic cosmological model, always become autonomous differential equations. This relies on t…
Modified gravity: a unified approach
Christian G. Boehmer, Erik Jensko
Starting from the original Einstein action, sometimes called the Gamma squared action, we propose a new setup to formulate modified theories of gravity. This can yield a theory wit…