Challenges for ΛCDM: An update
L Perivolaropoulos, F Skara - New Astronomy Reviews, 2022 - Elsevier
A number of challenges to the standard Λ CDM model have been emerging during the past
few years as the accuracy of cosmological observations improves. In this review we discuss …
few years as the accuracy of cosmological observations improves. In this review we discuss …
Coupling metric-affine gravity to the standard model and dark matter fermions
C Rigouzzo, S Zell - Physical Review D, 2023 - APS
General relativity (GR) exists in different formulations, which are equivalent in pure gravity.
Once matter is included, however, observable predictions generically depend on the version …
Once matter is included, however, observable predictions generically depend on the version …
Coupling metric-affine gravity to a Higgs-like scalar field
C Rigouzzo, S Zell - Physical Review D, 2022 - APS
General relativity (GR) exists in different formulations. They are equivalent in pure gravity but
generically lead to distinct predictions once matter is included. After a brief overview of …
generically lead to distinct predictions once matter is included. After a brief overview of …
Einstein-Proca theory from the Einstein-Cartan formulation
W Barker, S Zell - Physical Review D, 2024 - APS
We construct a theory of gravity in which a propagating massive vector field arises from a
quadratic curvature invariant. The Einstein-Cartan formulation and a partial suppression of …
quadratic curvature invariant. The Einstein-Cartan formulation and a partial suppression of …
Testing spatial curvature and anisotropic expansion on top of the ΛCDM model
We explore the possible advantages of extending the standard Λ CDM model by more
realistic backgrounds compared to its spatially flat Robertson–Walker (RW) spacetime …
realistic backgrounds compared to its spatially flat Robertson–Walker (RW) spacetime …
Constraining bouncing cosmologies through primordial black holes
The phenomenology of primordial black hole (PBH) physics and the associated PBH
abundance constraints can be used to probe the physics of the early universe. In this work …
abundance constraints can be used to probe the physics of the early universe. In this work …
First post-Newtonian N-body problem in Einstein–Cartan theory with the Weyssenhoff fluid: Lagrangian and first integrals
E Battista, V De Falco, D Usseglio - The European Physical Journal C, 2023 - Springer
The rotational dynamics of an N-body system at the first post-Newtonian order in Einstein–
Cartan theory is derived. This result is achieved by performing the point-particle limit of the …
Cartan theory is derived. This result is achieved by performing the point-particle limit of the …
Torsional dark energy in quadratic gauge gravity
A van de Venn, D Vasak, J Kirsch… - The European Physical …, 2023 - Springer
The covariant canonical gauge theory of gravity (CCGG) is a gauge field formulation of
gravity which a priori includes non-metricity and torsion. It extends the Lagrangian of …
gravity which a priori includes non-metricity and torsion. It extends the Lagrangian of …
Semi-Symmetric Metric Gravity: From the Friedmann–Schouten geometry with torsion to dynamical dark energy models
L Csillag, T Harko - Physics of the Dark Universe, 2024 - Elsevier
In this paper, we develop a geometric generalization of General Relativity based on the semi-
symmetric metric connection introduced by Friedmann and Schouten in 1924. Although the …
symmetric metric connection introduced by Friedmann and Schouten in 1924. Although the …
A Purely Gravitational Origin for Einstein-Proca Theory
W Barker, S Zell - arXiv preprint arXiv:2306.14953, 2023 - arxiv.org
We construct a theory of gravity in which a propagating massive vector field arises from a
quadratic curvature invariant. The Einstein-Cartan formulation and a partial suppression of …
quadratic curvature invariant. The Einstein-Cartan formulation and a partial suppression of …