Results 81 to 90 of about 18,336 (194)
European Physical Journal C: Particles and Fields, 2023 In this work, we attempt to find an anisotropic solution for a compact star generated by gravitational decoupling in f(Q)-gravity theory having a null complexity factor.
S. K. Maurya +5 more
doaj +1 more source
The Futures of Bianchi type VII0 cosmologies with vorticity
, 2005 We use expansion-normalised variables to investigate the Bianchi type VII$_0$ model with a tilted $\gamma$-law perfect fluid. We emphasize the late-time asymptotic dynamical behaviour of the models and determine their asymptotic states.
+23 more
core +3 more sources
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
The Initial Singularity of Ultrastiff Perfect Fluid Spacetimes Without Symmetries [PDF]
Communications in Mathematical Physics, 2012 We consider the Einstein equations coupled to an ultrastiff perfect fluid and prove the existence of a family of solutions with an initial singularity whose structure is that of explicit isotropic models. This family of solutions is `generic' in the sense that it depends on as many free functions as a general solution, i.e., without imposing any ...
Heinzle, Johannes Markus, Sandin, Patrik
openaire +2 more sources
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
Geometric conservation in curved spacetime and entropy
European Physical Journal C: Particles and FieldsWe provide an improved definition of new conserved quantities derived from the energy–momentum tensor in curved spacetime by introducing an additional scalar function.
Sinya Aoki +3 more
doaj +1 more source
Black holes and stars in Horava-Lifshitz theory with projectability condition
, 2010 We systematically study spherically symmetric static spacetimes filled with a fluid in the Horava-Lifshitz theory of gravity with the projectability condition, but without the detailed balance. We establish that when the spacetime is spatially Ricci flat
Greenwald, Jared +2 more
core +1 more source
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 +5 more
wiley +1 more source
Observed jet power and radiative efficiency of black hole candidates in the Kerr+PFDM model
European Physical Journal C: Particles and FieldsIn this research, we explore the electromagnetic energy emitted by astrophysical black holes within the Kerr+PFDM (Kerr + perfect fluid dark matter) spacetime, a model comprising rotating black holes surrounded by dark matter.
Bakhtiyor Narzilloev +3 more
doaj +1 more source