Zobrazeno 1 - 10
of 71
pro vyhledávání: '"Vasak, David"'
Publikováno v:
Phys. Rev. D 110, 064082 (2024)
This study examines the formulation of a singularity theorem for timelike curves including torsion, and establishes the foundational framework necessary for its derivation. We begin by deriving the relative acceleration for an arbitrary congruence of
Externí odkaz:
http://arxiv.org/abs/2407.21107
Publikováno v:
Phys. Rev. D 110 063028 (2024)
Dark energy (and its simplest model, the Cosmological Constant or $\Lambda$) acts as a repulsive force that opposes gravitational attraction. Assuming galaxies maintain a steady state over extended periods, the estimated upper limit on $\Lambda$ stud
Externí odkaz:
http://arxiv.org/abs/2405.16650
The dynamics of the torsion field is analyzed in the framework of the Covariant Canonical Gauge Theory of Gravity (CCGG), a De~Donder-Weyl Hamiltonian formulation of gauge gravity. The action is quadratic in both, the torsion and the Riemann-Cartan t
Externí odkaz:
http://arxiv.org/abs/2311.18602
Autor:
Vasak, David, Struckmeier, Jürgen
The framework of the Covariant Canonical Gauge theory of Gravity (CCGG) is described in detail. CCGG emerges naturally in the Palatini formulation, where the vierbein and the spin connection are independent fields. Neither torsion nor non-metricity a
Externí odkaz:
http://arxiv.org/abs/2304.10228
We study a cosmological model based on the canonical Hamiltonian transformation theory. Using a linear-quadratic approach for the free gravitational De Donder-Weyl Hamiltonian $H_\mathrm{Gr}$, the model contains terms describing a deformation of an A
Externí odkaz:
http://arxiv.org/abs/2303.01165
Publikováno v:
Eur. Phys. J. C 83, 288 (2023)
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 Einstein's theory of general relativity by terms at least quadratic in the
Externí odkaz:
http://arxiv.org/abs/2211.11868
Autor:
Denk, Vladimir1,2 (AUTHOR) denk@fias.uni-frankfurt.de, Vasak, David1 (AUTHOR), Kirsch, Johannes1 (AUTHOR)
Publikováno v:
European Physical Journal C -- Particles & Fields. Jun2024, Vol. 84 Issue 6, p1-11. 11p.
Autor:
Benisty, David, Guendelman, Eduardo I., van de Venn, Armin, Vasak, David, Struckmeier, Jürgen, Stoecker, Horst
Publikováno v:
Eur. Phys. J. C 82, 264 (2022)
An extension to the Einstein-Cartan (EC) action is discussed in terms of cosmological solutions. The torsion incorporated in the EC Lagrangian is assumed to be totally anti-symmetric, represented by a time-like axial vector $S^\mu$. The dynamics of t
Externí odkaz:
http://arxiv.org/abs/2109.01052
Publikováno v:
Eur. Phys. J. C81 (2021) 125
Constraints on the Covariant Canonical Gauge Gravity (CCGG) theory from low-redshift cosmology are studied. The formulation extends Einstein's theory of General Relativity (GR) by a quadratic Riemann-Cartan term in the Lagrangian, controlled by a "de
Externí odkaz:
http://arxiv.org/abs/2101.07566
The cosmological implications of the Covariant Canonical Gauge Theory of Gravity (CCGG) are investigated. CCGG is a Palatini theory derived from first principles using the canonical transformation formalism in the covariant Hamiltonian formulation. T
Externí odkaz:
http://arxiv.org/abs/2101.04379