J Annala, S Räsänen - Journal of Cosmology and Astroparticle …, 2023 - iopscience.iop.org
We study the stability of theories where the gravitational action has arbitrary algebraic dependence on the three first traces of the Riemann tensor: the Ricci tensor, the co-Ricci …
This book presents the most common types of instabilities arising in classical field theories, namely tachyonic, Laplacian, ghost-like or strong coupling instabilities, also commenting on …
In loop quantum cosmology (LQC) the big bang singularity is generically resolved by a big bounce. This feature holds even when modified quantization prescriptions of the …
W Barker, S Zell - arXiv preprint arXiv:2402.14917, 2024 - arxiv.org
It is well-known that the Einstein-Hilbert action exhibits a projective invariance in metric- affine gravity, generated by a single vector (just like diffeomorphisms). However, this …
Within the framework of the spontaneous Lorentz symmetry breaking, we consider a metric– affine generalization of the gravitational sector of the Standard–Model Extension (SME) …
Modified theories of gravity usually present new degrees of freedom, as well as higher order derivatives, wrong signs in certain terms and complicated couplings already present in the …
A Agashe - Physica Scripta, 2023 - iopscience.iop.org
In a given geometry, the kinematics of a congruence of curves is described by a set of three quantities called expansion, rotation, and shear. The equations governing the evolution of …
A Casado-Turrión - arXiv preprint arXiv:2312.03757, 2023 - arxiv.org
This thesis aims at improving our understanding of the strong-field regime of gravity, where deviations from General Relativity (GR) are expected to be found on theoretical grounds. In …
V Ilisie - Journal of High Energy Physics, 2022 - Springer
A bstract In this work we study the high-energy Higgs boson phenomenology associated to the non-metricity scale Λ Q at the LHC. Non-metricity is present in more generic non …