299 citations · 1.4k across the 50 of their papers we have counts for
45 papers · 1 filter
A Cartan-geometrical perspective on torsion and non-metricity
Damianos Iosifidis, Tomi Koivisto, Wit Krośnicki +1
Élie Cartan established that the metric and intrinsic curvature of a dimensional embedded manifold could be determined by tracing the response of another surface of the…
Scalar field with nonminimal couplings to metric-affine geometry
Ilaria Andrei, Damianos Iosifidis, Laur Järv +1
We study a scalar field nonminimally coupled to metric-affine gravity within actions linear in the affine curvature and containing all independent parity-even and parity-odd terms…
Inflation with Nieh-Yan-like terms in metric-affine gravity
Ilaria Andrei, Christian Dioguardi, Damianos Iosifidis +3
We study single-field slow-roll inflation in metric-affine gravity with a scalar field non-minimally coupled to the non-Riemannian Ricci scalar and to the divergences of the torsio…
Friedmann cosmology with fluids and hyperfluids
Ilaria Andrei, Damianos Iosifidis, Laur Järv +1
We discuss flat Friedmann-Lemaitre-Robertson-Walker (FLRW) metric-affine cosmology where the metric and connection as well as the matter energy-momentum and hypermomentum all obey…
Pole inflation from extended metric-affine gravity
Damianos Iosifidis, Sotirios Karamitsos
We study inflation in the framework of extended metric-affine F(R) gravity, where all even-parity quadratic invariants of torsion and non-metricity are included in the Lagrangian a…
Non-local Metric-Affine Gravity
Salvatore Capozziello, Damianos Iosifidis
Non-local gravity can potentially solve several problems of gravitational field both at Ultra-Violet and Infra-Red scales. However, such an approach has been formulated mainly in m…
Lagrangian Dynamics of Spinning Pole-Dipole-Quadrupole Particles in Metric-Affine Geometries
Damianos Iosifidis
We construct the Lagrangian formulation of a micro-structured spinning, dilating and shearing (deformable) test body, moving in arbitrary non-Riemannian backgrounds possessing all…
Friedmann cosmology with hyperfluids of constant equation of state
Ilaria Andrei, Damianos Iosifidis, Laur Järv +1
We discuss some aspects of cosmology in metric-affine theories of gravity where metric and affine connection are independent variables. Such constructions, apart from the usual ene…
On the role of the Parity Violating Hojman--Holst term in Gravity Theories
Damianos Iosifidis
We study Parity Violating Gravity Theories whose gravitational Lagrangian is a generic function of the scalar curvature and the parity odd curvature pseudoscalar, commonly known as…
Cosmology of Cubic Poincaré Gauge gravity
Sebastian Bahamonde, Rebecca Briffa, Konstantinos Dialektopoulos +2
In this paper, we study flat FLRW cosmology for a Poincaré gauge theory containing cubic invariants that is free from ghosts in arbitrary backgrounds in the axial and vector sector…
Complete background cosmology of parity-even quadratic metric-affine gravity
Thomas Dyer, Will Barker, Damianos Iosifidis
The cosmology of metric-affine gravity is studied for the general, parity preserving action quadratic in curvature, torsion and non-metricity. The model contains 27 a priori indepe…
Friedmann cosmology with hyperfluids
Ilaria Andrei, Damianos Iosifidis, Laur Järv +1
In metric-affine gravity, both the gravitational and matter actions depend not just on the metric, but also on the independent affine connection. Thus matter can be modeled as a hy…
Extended Metric-Affine Gravity with Dynamical Connection in Vacuum
Damianos Iosifidis
We extend the usual vacuum Metric-Affine Gravity by supplementing it with all parity even quadratic invariants in torsion and non-metricity. As we show explicitly this suppl…
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…
Statistical conformal Killing Vector Fields for FLRW Space-Time
Esmaeil Peyghan, Leila Nourmohammadifar, Damianos Iosifidis
The classification of conformal Killing vector fields for FLRW space-time from Riemannian point of view was done by Maartens-Maharaj in \cite{Maartens1986}. In this paper, we intro…
Into the MAG-verse or: Cosmology of the Complete Quadratic Metric-Affine Gravity
Damianos Iosifidis, Konstantinos Pallikaris
We study the cosmology of the complete quadratic (in torsion and nonmetricity) metric-affine gravity. Namely, we add to the scalar-curvature gravitational Lagrangian, the 17 indepe…
Schrödinger Connections: From Mathematical Foundations Towards Yano-Schrödinger Cosmology
Lehel Csillag, Anish Agashe, Damianos Iosifidis
Schrödinger connections are a special class of affine connections, which despite being metric incompatible, preserve length of vectors under autoparallel transport. In the present…
Hyperhydrodynamics: Relativistic Viscous Fluids Emerging from Hypermomentum
Damianos Iosifidis, Tomi S. Koivisto
We explore a new action formulation of hyperfluids, fluids with intrinsic hypermomentum. Brown's Lagrangian for a relativistic perfect fluid is generalised by incorporating the deg…
Motion of Test Particles in Spacetimes with Torsion and Nonmetricity
Danianos Iosifidis, Friedrich W. Hehl
We derive the equations of motion of a test particle with intrinsic hypermomentum in spacetimes with both torsion and nonmetricity (along with curvature ). Accordingly,…
Biconnection Gravity as a Statistical Manifold
Damianos Iosifidis, Konstantinos Pallikaris
We formulate a bi-Connection Theory of Gravity whose Gravitational action consists of a recently defined mutual curvature scalar. Namely, we build a gravitational theory consisting…
Describing metric-affine theories anew: alternative frameworks, examples and solutions
Damianos Iosifidis, Konstantinos Pallikaris
In this work we describe metric-affine theories anew by making a change of field variables. A series of equivalent frameworks is presented and identifications are worked out in det…
Cosmology of Metric-Affine Gravity with Pure Shear Hypermomentum
Damianos Iosifidis, Ratbay Myrzakulov, Lucrezia Ravera
In this paper we study the cosmological aspects of metric-affine gravity with hyperfluid. The equations of motion of the theory are obtained by varying the action with respe…
Friedmann-like universes with non-metricity
Damianos Iosifidis, Ioannis Georgios Vogiatzis, Christos G. Tsagas
We study the potential effects of spacetime non-metricity in cosmology. In the spirit of Einstein-Cartan gravity, but with non-metricity replacing torsion, we consider the Einstein…
The Full Quadratic Metric-Affine Gravity (Including Parity Odd Terms): Exact solutions for the Affine-Connection
Damianos Iosifidis
We consider the most general Quadratic Metric-Affine Gravity setup in the presence of generic matter sources with non-vanishing hypermomentum. The gravitational action consists of…