Zobrazeno 1 - 10
of 246
pro vyhledávání: '"Coley, Alan"'
Autor:
Hooft, Gerard t, Phillips, William D, Zeilinger, Anton, Allen, Roland, Baggott, Jim, Bouchet, Francois R, Cantanhede, Solange M G, Castanedo, Lazaro A M, Cetto, Ana Maria, Coley, Alan A, Dalton, Bryan J, Fahimi, Peyman, Franks, Sharon, Frano, Alex, Fry, Edward S, Goldfarb, Steven, Langanke, Karlheinz, Matta, Cherif F, Nanopoulos, Dimitri, Orzel, Chad, Patrick, Sam, Sanghai, Viraj A A, Schuller, Ivan K, Shpyrko, Oleg, Lidstrom, Suzy
Despite its amazing quantitative successes and contributions to revolutionary technologies, physics currently faces many unsolved mysteries ranging from the meaning of quantum mechanics to the nature of the dark energy that will determine the future
Externí odkaz:
http://arxiv.org/abs/2404.11724
This paper defines the photon surface conditions using Cartan scalars within an invariant spin frame, offering a comprehensive description of the local spacetime geometry. By employing this approach, we gain novel insights into the geometry and dynam
Externí odkaz:
http://arxiv.org/abs/2401.11936
Publikováno v:
SIGMA 20 (2024), 078, 20 pages
Riemann-Cartan geometries are geometries that admit non-zero curvature and torsion tensors. These geometries have been investigated as geometric frameworks for potential theories in physics including quantum gravity theories and have many important d
Externí odkaz:
http://arxiv.org/abs/2401.00780
Autor:
Coley, Alan, Lim, Woei Chet
Publikováno v:
Class. Quantum Grav. 41 015009 (2024)
In the standard concordance cosmology the spatial curvature is assumed to be constant and zero (or at least very small). In particular, in numerical computations of the structure of the universe using N-body simulations, exact periodic boundary condi
Externí odkaz:
http://arxiv.org/abs/2312.03285
Publikováno v:
Universe, 2023, 9(10), 454
In teleparallel geometries the coframe and corresponding spin-connection are the principal geometric objects and consequently the appropriate definition of a symmetry is that of an affine symmetry. The set of invariant coframes and their correspondin
Externí odkaz:
http://arxiv.org/abs/2310.14378
We investigate spherically symmetric static and dynamical Brans-Dicke theory exact solutions using invariants and, in particular, the Newman Penrose formalism utilizing Cartan scalars. The GR limit of these solutions is examined through the use of Ca
Externí odkaz:
http://arxiv.org/abs/2310.06783
We comprehensively analyze the dynamics for the gravitational field equations for the Chiral-Quintom theory in a Friedman-Lema\^itre-Robertson-Walker cosmology with an additional matter source. We consider a new set of dimensionless variables and wri
Externí odkaz:
http://arxiv.org/abs/2308.02470
Publikováno v:
Eur. Physical Journal C 83, 977 (2023)
Theories of gravity based on teleparallel geometries are characterized by the torsion, which is a function of the coframe, derivatives of the coframe, and a zero curvature and metric compatible spin connection. The appropriate notion of a symmetry in
Externí odkaz:
http://arxiv.org/abs/2307.12930
Autor:
Coley, Alan, Hoogen, Robert van den
Publikováno v:
J. Math. Phys. 64, 022503 (2023)
In teleparallel geometries, symmetries are represented by affine frame symmetries which constrain both the (co)frame basis and the spin-connection (which are the primary geometric objects). In this paper we shall study teleparallel geometries with a
Externí odkaz:
http://arxiv.org/abs/2205.07071
We shall present a complete (compactified) dynamical systems analysis of the Quintom model comprised of an interacting quintessence scalar field and a phantom. We find a range for the model parameters $\kappa, \lambda$ such that there are expanding Q
Externí odkaz:
http://arxiv.org/abs/2204.06538