Results 121 to 130 of about 298,518 (247)

On stability and scalar curvature rigidity of quaternion-Kähler manifolds [PDF]

open access: yesarXiv
We show that every quaternion-K\"ahler manifold of negative scalar curvature is stable as an Einstein manifold and therefore scalar curvature rigid. In particular, this implies that every irreducible nonpositive Einstein manifold of special holonomy is stable. In contrast, we demonstrate that there exist quaternion-K\"ahler manifolds of positive scalar
arxiv  

Hagedorn temperature from the thermal scalar in AdS and pp-wave backgrounds

open access: yesJournal of High Energy Physics
We propose a thermal scalar equation of motion (EOM) that takes into account curvature corrections for backgrounds supported by Ramond-Ramond fluxes.
Troels Harmark
doaj   +1 more source

Scalar curvature lower bounds on asymptotically flat manifolds [PDF]

open access: yesarXiv
In this paper, we consider the scalar curvature in the distributional sense of \cite{MR3366052} and the scalar curvature lower bound in the $\beta-$weak $(\beta\in(0, \frac{1}{2}))$ sense of \cite{MR4685089} on an asymptotically flat $n-$manifold with a $W^{1,p}(p>n)$ metric.
arxiv  

The existence results for solutions of indefinite scalar curvature problem [PDF]

open access: yesarXiv, 2008
In this paper, we consider the indefinite scalar curvature problem on $R^n$. We propose new conditions on the prescribing scalar curvature function such that the scalar curvature problem on $R^n$ (similarly, on $S^n$) has at least one solution. The key observation in our proof is that we use the bifurcation method to get a large solution and then after
arxiv  

Einstein like -para Sasakian manifolds

open access: yesKuwait Journal of Science, 2013
Einstein like  -para Sasakian manifolds are introduced. For an  -para Sasakian manifold to be Einstein like, a necessary and sufficient condition in terms of its curvature tensor is obtained.
SADIK KELES   +3 more
doaj  

On Curvature Pinching for Submanifolds with Parallel Normalized Mean Curvature Vector

open access: yesMathematics
In this note, we investigate the pinching problem for oriented compact submanifolds of dimension n with parallel normalized mean curvature vector in a space form Fn+p(c).
Juanru Gu, Yao Lu
doaj   +1 more source

Holographic superconductors in 4D Einstein-Gauss-Bonnet gravity with backreactions

open access: yesPhysics Letters B, 2021
We construct the holographic superconductors away from the probe limit in the consistent D→4 Einstein-Gauss-Bonnet gravity. We observe that, both for the ground state and excited states, the critical temperature first decreases then increases as the ...
Jie Pan   +5 more
doaj  

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