From the 1 of 7 linked papers with an AI index.
7 papers
Physical nonviability of in the scalar-tensor representation
Jose Beltrán Jiménez, Alejandro Jiménez Cano, Tomi S. Koivisto
The authors demonstrate that the scalar‑tensor representation of f(Q) gravity inevitably contains a propagating ghost degree of freedom, confirming its physical non‑viability.
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…
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 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…
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…