Zobrazeno 1 - 10
of 985
pro vyhledávání: '"Tamvakis A"'
In the context of metric-affine gravity theories, where the metric and connection are independent, we examine actions involving quadratic terms in the Ricci scalar curvature and the Holst invariant. These actions are non-minimally coupled to a scalar
Externí odkaz:
http://arxiv.org/abs/2410.22263
We consider Weyl-invariant quadratic Einstein-Cartan gravity coupled to a scalar field and study the inflationary behaviour of the coupled system of the scalar field and the pseudoscalar associated with the Holst invariant. We find that the model is
Externí odkaz:
http://arxiv.org/abs/2410.16364
Within the framework of metric-affine theories of gravity, where both the metric and connection are treated as independent variables, we consider actions quadratic in the Ricci scalar curvature coupled non-minimally to a scalar field through derivati
Externí odkaz:
http://arxiv.org/abs/2403.08530
An extension of the bimetric theory of gravity is considered that includes quadratic Ricci curvature terms associated with each metric. The issue of the Boulware-Deser ghost is analyzed. The Hamiltonian constraint is derived and the existence of a se
Externí odkaz:
http://arxiv.org/abs/2311.14799
Autor:
Chiniadis, Lykourgos, Tamvakis, Petros
Soil NIR spectral absorbance/reflectance libraries are utilized towards improving agricultural production and analysis of soil properties which are key prerequisite for agroecological balance and environmental sustainability. Carbonates in particular
Externí odkaz:
http://arxiv.org/abs/2307.12341
The bimetric theory of gravity is an extension of general relativity that describes a massive spin-$2$ particle in addition to the standard massless graviton. The theory is based on two dynamical metric tensors with their interactions constrained by
Externí odkaz:
http://arxiv.org/abs/2307.05673
Bimetric gravity, is a theory of gravity that posits the existence of two interacting and dynamical metric tensors. The spectrum of bimetric gravity consists of a massless and a massive spin-2 particle. The form of the interactions between the two me
Externí odkaz:
http://arxiv.org/abs/2303.11353
Publikováno v:
Helminthologia, Vol 49, Iss 1, Pp 16-20 (2012)
Externí odkaz:
https://doaj.org/article/c9e16e0243d741b4ad39d41bd7c9b620
Publikováno v:
JCAP 03 (2023) 042
In the general framework of Metric-Affine theories of gravity, where the metric and the connection are independent variables, we consider actions quadratic in the Ricci scalar curvature and the Holst invariant (the contraction of the Riemann curvatur
Externí odkaz:
http://arxiv.org/abs/2212.09896
Autor:
Tamvakis, Petros N., Kiourt, Chairi, Solomou, Alexandra D., Ioannakis, George, Tsirliganis, Nestoras C.
Plant phenotyping refers to a quantitative description of the plants properties, however in image-based phenotyping analysis, our focus is primarily on the plants anatomical, ontogenetical and physiological properties.This technique reinforced by the
Externí odkaz:
http://arxiv.org/abs/2210.13296