Results 71 to 80 of about 7,610 (173)

ON A PERFECT FLUID K¨ AHLER SPACETIME

JOURNAL OF ADVANCES IN PHYSICS, 2016
The object of the present paper is to study a perfect fluid K¨ahlerspacetime. A perfect fluid K¨ahler spacetime satisfying the Einstein field equation with a cosmological term has been studied and the existence of killingand conformal killing vectors have been discussed.
P. N. PANDEY, VIBHA SRIVASTAVA
openaire   +1 more source

Is Kant's critique of metaphysics obsolete?

Philosophy and Phenomenological Research, Volume 111, Issue 1, Page 25-53, July 2025.
Abstract I raise a problem about the possibility of metaphysics originally due to Kant: what explains the fact that the terms in our metaphysical theories (e.g., ‘property’, ‘grounding’) refer to entities and structures (e.g., properties, grounding) in the world?
Nicholas F. Stang
wiley   +1 more source

Legal Methodology and Complexity: A Comment on Allen

Ratio Juris, Volume 38, Issue 2, Page 108-128, July 2025.
Abstract This article is a response to Ronald J. Allen's “Reflections on Complexity, Evidence, and Law.” I begin by analyzing three key concepts that Allen employs in his argument: reductionism, emergence, and complexity. On the basis of this analysis, I question Allen's criticism of the reductionist approach that, according to him, legal scholarship ...
Michele Ubertone
wiley   +1 more source

Societal Trends and Opportunities in the Aftermath of the Nova Psychedelic Trance Rave, Through Lilla and Benjamin

Future Humanities, Volume 3, Issue 1, May 2025.
ABSTRACT This fiction article is about trauma and grief, resilience and the celebration of life. It also addresses the role psychedelics can play in bringing about change in our traumatized society by inspiring us and showing us how to use the present as a possibility for fundamental transformation.
Demian Halperin, Tal Bar On, Nir Tadmor, Alma Maria Simon, Aaron David Cherniak, Guy Simon   +5 more
wiley   +1 more source

Geometry of Manifolds and Applications

Mathematics
This editorial presents 24 research articles published in the Special Issue entitled Geometry of Manifolds and Applications of the MDPI Mathematics journal, which covers a wide range of topics from the geometry of (pseudo-)Riemannian manifolds and their ...
Adara M. Blaga
doaj   +1 more source

Inverse approach to Einstein's equations for fluids with vanishing anisotropic stress tensor

, 2007
We expand previous work on an inverse approach to Einstein Field Equations where we include fluids with energy flux and consider the vanishing of the anisotropic stress tensor.
A. Krasinski, A. Vilenkin, A. G. Walker, D. N. Mogue, G. Horedt, H. Stephani, James Richardson, Mustapha Ishak, N. Dadhich, S. Hawking, V. V. Narlikar, V. V. Narlikar, W. G. Laarakkers   +12 more
core   +1 more source

Cosmological Dynamics of Interacting Dark Energy and Dark Matter in f(Q)$f(Q)$ Gravity

Fortschritte der Physik, Volume 73, Issue 5, May 2025.
Abstract In this work, the behavior of interacting dark energy (DE) and dark matter (DM) within a model of f(Q)$f(Q)$ gravity is explored, employing the standard framework of dynamical system analysis. The power‐law f(Q)$f(Q)$ model is considered, incorporating two different forms of interacting DE and DM: 3αHρm$3\alpha H\rho _m$ and α3HρmρDE$\frac ...
Gaurav N. Gadbail, Simran Arora, Phongpichit Channuie, P. K. Sahoo   +3 more
wiley   +1 more source

Singularities in asymptotically anti-de Sitter spacetimes

, 2012
We consider singularity theorems in asymptotically anti-de Sitter (AdS) spacetimes. In the first part, we discuss the global methods used to show geodesic incompleteness and see that when the conditions imposed in Hawking and Penrose's singularity ...
Ishibashi, Akihiro, Maeda, Kengo
core   +1 more source

Euler–Heisenberg Black Hole Surrounded by Quintessence in the Background of Perfect Fluid Dark Matter: Thermodynamics, Shadows, and Quasinormal Modes

Fortschritte der Physik, Volume 73, Issue 3, March 2025.
Abstract Current observations show that a significant fraction of the Universe is composed of dark energy and dark matter. In this paper, the simultaneous effects of these dark sectors on the Euler–Heisenberg black hole are investigated, using the quintessence matter field and perfect fluid to model them. In particular, the black hole's thermodynamics,
Bilel Hamil, Bekir Can Lütfüoğlu
wiley   +1 more source

Holographic fluids from 5D dilaton gravity

Journal of High Energy Physics
We study a solvable class of five-dimensional dilaton gravity models that continuously interpolate between anti-de Sitter (AdS5), linear dilaton (LD5) and positively curved spacetimes as a function of a continuous parameter ν.
Sylvain Fichet, Eugenio Megías, Mariano Quirós   +2 more
doaj   +1 more source