535 citations · 3.5k across the 39 of their papers we have counts for
39 papers
Energy conditions in consistent perfect fluid cosmology
Davide Batic, Christian G. Boehmer, Denys Dutykh
Motivated by recent work on consistent fluid couplings in gravity, we study cosmology in the nontrivial model using the Brown variational principle f…
Cosmological fluids with boundary term couplings
Christian G. Boehmer, Antonio d'Alfonso del Sordo
Cosmological models can be studied effectively using dynamical systems techniques. Starting from Brown's formulation of the variational principle for relativistic fluids, we introd…
New Horizons for Fundamental Physics with LISA
K. G. Arun, Enis Belgacem, Robert Benkel +138
The Laser Interferometer Space Antenna (LISA) has the potential to reveal wonders about the fundamental theory of nature at play in the extreme gravity regime, where the gravitatio…
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…
On Freud's superpotential in General Relativity and in Einstein-Cartan theory
Christian G. Boehmer, Friedrich W. Hehl
The identification of a suitable gravitational energy in theories of gravity has a long history, and it is well known that a unique answer cannot be given. In the first part of thi…
Does space-time torsion determine the minimum mass of gravitating particles?
Christian G. Boehmer, Piyabut Burikham, Tiberiu Harko +1
We derive upper and lower limits for the mass-radius ratio of spin-fluid spheres in Einstein-Cartan theory, with matter satisfying a linear barotropic equation of state, and in the…
Modified teleparallel theories of gravity -- Gauss-Bonnet and trace extensions
Sebastian Bahamonde, Christian G. Boehmer
We investigate modified theories of gravity in the context of teleparallel geometries with possible Gauss-Bonnet contributions. The possible coupling of gravity with the trace of t…
The Einstein static universe in Scalar-Fluid theories
Christian G. Boehmer, Nicola Tamanini, Matthew Wright
A new Lagrangian framework has recently been proposed to describe interactions between relativistic perfect fluids and scalar fields. In this paper we investigate the Einstein stat…
Modified teleparallel theories of gravity
Sebastian Bahamonde, Christian G. Boehmer, Matthew Wright
We investigate modified theories of gravity in the context of teleparallel geometries. It is well known that modified gravity models based on the torsion scalar are not invariant u…
Generalized gravity and the late-time cosmic acceleration
Sebastian Bahamonde, Christian G. Boehmer, Francisco S. N. Lobo +1
High-precision observational data have confirmed with startling evidence that the Universe is currently undergoing a phase of accelerated expansion. This phase, one of the most imp…
Soliton-like solutions based on geometrically nonlinear Cosserat micropolar elasticity
Christian G. Boehmer, Patrizio Neff, Belgin Seymenoglu
The Cosserat model generalises an elastic material taking into account the possible microstructure of the elements of the material continuum. In particular, within the Cosserat mod…
Slowly rotating perfect fluids with a cosmological constant
Christian G. Boehmer, Matthew Wright
Hartle's slow rotation formalism is developed in the presence of a cosmological constant. We find the generalisation of the Hartle-Thorne vacuum metric, the Hartle-Thorne-(anti)-de…
From continuum mechanics to general relativity
Christian G. Boehmer, Robert J. Downes
Using ideas from continuum mechanics we construct a theory of gravity. We show that this theory is equivalent to Einstein's theory of general relativity; it is also a much faster w…
On galaxy rotation curves from a continuum mechanics approach to modified gravity
Christian G. Boehmer, Nicola Tamanini, Matthew Wright
We consider a modification of General Relativity motivated by the treatment of anisotropies in Continuum Mechanics. The Newtonian limit of the theory is formulated and applied to g…
Einstein static Universe in hybrid metric-Palatini gravity
Christian G. Boehmer, Francisco S. N. Lobo, Nicola Tamanini
Hybrid metric-Palatini gravity is a recent and novel approach to modified theories of gravity, which consists of adding to the metric Einstein-Hilbert Lagrangian an f(R) term const…
Definition of Good Tetrads for f(T) Gravity
Nicola Tamanini, Christian G. Boehmer
The importance of choosing suitable tetrads for the study of exact solutions in f(T) gravity is discussed. For any given metric, we define the concept of good tetrads as the tetrad…
Generalized hybrid metric-Palatini gravity
Nicola Tamanini, Christian G. Boehmer
We introduce a new approach to modified gravity which generalizes the recently proposed hybrid metric-Palatini gravity. The gravitational action is taken to depend on a general fun…
A new approach to modifying theories of gravity
Christian G. Boehmer, Nicola Tamanini
We propose a new point of view for interpreting Newton's and Einstein's theories of gravity. By taking inspiration from Continuum Mechanics and its treatment of anisotropies, we fo…
Good and bad tetrads in f(T) gravity
Nicola Tamanini, Christian G. Boehmer
We investigate the importance of choosing good tetrads for the study of the field equations of gravity. It is well known that this theory is not invariant under local Lorent…
Helicity -- from Clifford to Graphene
Christian G. Boehmer, Louie Corpe
We investigate two seemingly disjoint definitions of helicity, one commonly used in particle physics, the other one used when studying bilinear covariants of Clifford algebras. We…
Bounds on M/R for Charged Objects with positive Cosmological constant
Håkan Andréasson, Christian G. Boehmer, Atifah Mussa
We consider charged spherically symmetric static solutions of the Einstein-Maxwell equations with a positive cosmological constant . If denotes the area radius, and $q…
Dynamics of dark energy models and centre manifolds
Christian G. Boehmer, Nyein Chan, Ruth Lazkoz
We analyse dark energy models where self-interacting three-forms or phantom fields drive the accelerated expansion of the Universe. The dynamics of such models is often studied by…
Wormhole geometries in modified teleparralel gravity and the energy conditions
Christian G. Boehmer, Tiberiu Harko, Francisco S. N. Lobo
In this work, we explore the possibility that static and spherically symmetric traversable wormhole geometries are supported by modified teleparallel gravity or f(T) gravity, where…
Existence of relativistic stars in f(T) gravity
Christian G. Boehmer, Atifah Mussa, Nicola Tamanini
We examine the existence of relativistic stars in f(T) modified gravity and explicitly construct several classes of static perfect fluid solutions. We derive the conservation equat…