Zobrazeno 1 - 10
of 119
pro vyhledávání: '"Terzis, Petros"'
We solve the gravitational field equations for a static, spherically symmetric spacetime within the framework of the symmetric teleparallel theory of gravity. Specifically, we derive new solutions within the context of power-law $f(Q)$ gravity and th
Externí odkaz:
http://arxiv.org/abs/2410.04513
Publikováno v:
Proceedings of the 2024 ACM Conference on Fairness, Accountability and Transparency (FAccT '24) (ACM 2024)
For almost a decade now, scholarship in and beyond the ACM FAccT community has been focusing on novel and innovative ways and methodologies to audit the functioning of algorithmic systems. Over the years, this research idea and technical project has
Externí odkaz:
http://arxiv.org/abs/2406.11855
The system under study is the $\Lambda$-Kantowski-Sachs universe. Its canonical quantization is provided based on a recently developed method: the singular minisuperspace Lagrangian describing the system, is reduced to a regular (by inserting into th
Externí odkaz:
http://arxiv.org/abs/2105.13658
We present, for the first time, the quantization process for the Einstein-aether scalar field cosmology. We consider a cosmological theory proposed as a Lorentz violating inflationary model, where the aether and scalar fields interact through the ass
Externí odkaz:
http://arxiv.org/abs/2008.00746
Publikováno v:
Phys. Rev. D 102, 063524 (2020)
We find the symmetry generators for the Friedman equations emanating from a perfect fluid source, in the presence of a cosmological constant term. The relevant dynamics is seen to be governed by two coupled, first order ordinary differential equation
Externí odkaz:
http://arxiv.org/abs/2005.11726
We present the solution space of the field equations in the Einstein-aether theory for the case of a vacuum Bianchi Type V space-time. We also find that there are portions of the initial parameters space for which no solution is admitted by the reduc
Externí odkaz:
http://arxiv.org/abs/1911.03660
We consider a cosmological model with two scalar fields minimally coupled to gravity which have a mixed kinetic term. Hence, Chiral cosmology is included in our analysis. The coupling function and the potential function, which depend on one of the fi
Externí odkaz:
http://arxiv.org/abs/1904.09713
Autor:
Pailas, T., Dimakis, N., Karagiorgos, A., Terzis, Petros A., Papadopoulos, G. O., Christodoulakis, T.
The general classical solution of the 3D electromagnetic pp-wave spacetime has been obtained. The relevant line element contains an arbitrary essential function providing an infinite number of in-equivalent geometries as solutions. A classification i
Externí odkaz:
http://arxiv.org/abs/1901.08243
Publikováno v:
Phys. Rev. D 99, 104061 (2019)
In this work we study the general system of geodesic equations for the case of a massive particle moving on an arbitrary curved manifold. The investigation is carried out from the symmetry perspective. By exploiting the parametrization invariance pro
Externí odkaz:
http://arxiv.org/abs/1901.07187
Autor:
Karagiorgos, A., Pailas, T., Dimakis, N., Papadopoulos, G. O., Terzis, Petros A., Christodoulakis, T.
In the present work we revisit the axisymmetric Bianchi VIII and IX models. At the classical level we reproduce the known analytic solution, in a novel way making use of two quadratic integrals of motion, the constraint equation, as well as a linear
Externí odkaz:
http://arxiv.org/abs/1812.10879