21 citations · 32 across the 10 of their papers we have counts for
12 papers
Canonical currents without improvements: the QCD example
Tomi Koivisto
In conventional formulations of relativistic field theory, energy-momentum and angular-momentum currents are defined only up to improvement terms in flat spacetime, and in curved s…
Hamiltonian surface charges in General Parallel Relativity
Tomi Koivisto
General Parallel Relativity is a dynamically equivalent formulation of Einstein gravity in which the parallel frame supplies explicit boundary reference data. In this formulation,…
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…
Physical nonviability of in the scalar-tensor representation
Jose Beltrán Jiménez, Alejandro Jiménez Cano, Tomi S. Koivisto
We show the known pathological character of gravity in its scalar-tensor representation.
A gauge theory of space, time, gravitation, matter and dark matter
Tomi Koivisto, Lucy Zheng, Tom Zlosnik
A gauge-theoretic framework for spacetime and gravitation is proposed, in which a Cartan khronon field breaks the symmetry between space and time, enabling the emergence of tempora…
Euclidean teleparallel relativity and black hole partition functions
Jose Beltrán Jiménez, Tomi S. Koivisto
The Euclidean path integral approach to quantum gravity is conventionally formulated in terms of the Einstein-Hilbert-York-Gibbons-Hawking action, which requires suitable subtracti…
Black holes in Lorentz gauge theory
Tomi S. Koivisto, Luxi Zheng
Black hole solutions are explored in the Lorentz gauge theory of gravity. The fields of the theory are the gauge potential in the adjoint and a scalar in the fundamental representa…
A class of ghost-free theories in symmetric teleparallel geometry
Antonio G. Bello-Morales, Jose Beltrán Jiménez, Alejandro Jiménez Cano +2
Theories formulated in the arena of teleparallel geometries are generically plagued by ghost-like instabilities or other pathologies that are ultimately caused by the breaking of s…
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…
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…
Consistent first order action functional for gauge theories
Priidik Gallagher, Tomi S. Koivisto, Luca Marzola +2
A novel first order action principle has been proposed as the possible foundation for a more fundamental theory of General Relativity and the Standard Model. It is shown in this ar…
Pathological Character of Modifications to Coincident General Relativity: Cosmological Strong Coupling and Ghosts in $f(\Q)$ Theories
Débora Aguiar Gomes, Jose Beltrán Jiménez, Alejandro Jiménez Cano +1
The intrinsic presence of ghosts in the symmetric teleparallel framework is elucidated. We illustrate our general arguments in theories by studying perturbations in…