Results 91 to 100 of about 241,236 (258)

THE SPECTRAL GEOMETRY OF EINSTEIN MANIFOLDS WITH BOUNDARY [PDF]

Journal of the Korean Mathematical Society, 2004
Let (M,g) be a compact Einstein manifold with smooth boundary. We consider the spectrum of the p form valued Laplacian with respect to a suitable boundary condition. We show that certain geometric properties of the boundary may be spectrally characterized in terms of this data where we fix the Einstein constant.
openaire   +2 more sources

Hospital Management Models and Cancer Care Outcomes in Brazil: Evidence From a Staggered Difference‐in‐Differences Study in São Paulo

The International Journal of Health Planning and Management, EarlyView.
ABSTRACT Background The state of São Paulo pioneered the adoption of Social Health Organisations (SHOs) under Complementary Law No. 846/1998 that would allow private non‐profit organisations to manage hospitals and health services under government contracts with the aim of gaining efficiency and improving quality of care.
Felipe Mendes Delpino, Francisco Tustumi, Marina Martins Siqueira, Gabriely Rangel Pereira, Lucas Hernandes Correa, Michael Anderson, Laia Maynou, Meskerem Aleka Kebede, Rachel Hargest, Nelson Wolosker, Rocco Friebel   +10 more
wiley   +1 more source

On the orientability of the asset equilibrium manifold [PDF]

This paper addresses partly an open question raised in the Handbook of Mathematical Economics about the orientability of the pseudo-equilibrium manifold in the basic two-period General Equilibrium with Incomplete markets (GEI) model. For a broad class of
Philippe Bich
core   +2 more sources

Super Quasi-Einstein Warped Products Manifolds with Respect to Affine Connections

Axioms
In this paper, we investigate warped products on super quasi-Einstein manifolds under affine connections. We explore their fundamental properties, establish conditions for their existence, and prove that these manifolds can also be nearly quasi-Einstein ...
Mohd Vasiulla, Mohabbat Ali, Meraj Ali Khan, Ibrahim Aldayel   +3 more
doaj   +1 more source

On Einstein, Hermitian 4-manifolds

Journal of Differential Geometry, 2012
Let (M,h) be a compact 4-dimensional Einstein manifold, and suppose that h is Hermitian with respect to some complex structure J on M. Then either (M,J,h) is Kaehler-Einstein, or else, up to rescaling and isometry, it is one of the following two exceptions: the Page metric on CP2 # (-CP2), or the Einstein metric on CP2 # 2 (-CP2) constructed in Chen ...
openaire   +3 more sources

Looking at Soil as It Is: Evolution of Microscopic Soil Characterization From Kubiëna to Artificial Intelligence

Journal of Plant Nutrition and Soil Science, EarlyView.
We provide a historic overview of microscopic soil structure characterization from its founding father, Walter Kubiëna, to several technical revolutions like automation, digitalization, and artificial intelligence. In addition to technical advancements, we explore how concepts and research questions have evolved in time.
Steffen Schlüter, Maik Geers‐Lucas, Peter Kühn, Hans‐Jörg Vogel   +3 more
wiley   +1 more source

7D supersymmetric Yang-Mills on curved manifolds

Journal of High Energy Physics, 2017
We study 7D maximally supersymmetric Yang-Mills theory on curved manifolds that admit Killing spinors. If the manifold admits at least two Killing spinors (Sasaki-Einstein manifolds) we are able to rewrite the supersymmetric theory in terms of a ...
Konstantina Polydorou, Andreas Rocén, Maxim Zabzine   +2 more
doaj   +1 more source

On Calabi's Inhomogeneous Einstein-Kaehler Manifolds [PDF]

Proceedings of the American Mathematical Society, 1977
We use some information on Lie groups to replace a long computation of Calabi, proving that certain complete Einstein-Kaehler manifolds are not locally homogeneous, and finding their isometry groups.
openaire   +2 more sources

Purely Coclosed G2‐Structures on Nilmanifolds—II

Mathematische Nachrichten, EarlyView.
ABSTRACT This paper completes the classification of seven‐dimensional nilpotent Lie groups endowed with a left‐invariant purely coclosed G2$\text{G}_2$‐structure, initiated in Bazzoni et al. [Mathematische Nachrichten 296 no. 6 (2023): 2236–2257], the authors provided the classification of decomposable seven‐dimensional nilpotent Lie groups and of the ...
Giovanni Bazzoni, Giorgia Petracci
wiley   +1 more source

Complex manifolds and Einstein’s equations

, 1982
We present a generalization of Penrose’s twistor theory based on the geometry of rational curves in complex manifolds. The analytical counterpart of this complex geometry consists, in the three simplest cases, of a system of differential equations closely connected with Einstein’s equations.
openaire   +2 more sources