Results 31 to 40 of about 4,558 (149)
Curvature Properties of Generalized pp-Wave Metrics
, 2021 The main objective of the present paper is to investigate the curvature properties of generalized pp-wave metrics. It is shown that a generalized pp-wave spacetime is Ricci generalized pseudosymmetric, 2-quasi-Einstein and generalized quasi-Einstein in ...
A. Shaikh, T. Binh, H. Kundu
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Extended Derdzinski-Shen theorem for the Riemann tensor [PDF]
, 2011 We extend a classical result by Derdzinski and Shen, on the restrictions imposed on the Riemann tensor by the existence of a nontrivial Codazzi tensor. The new conditions of the theorem include Codazzi tensors (i.e.
Mantica, Carlo Alberto +1 more
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Geometry of Quaternionic K\"ahler connections with torsion
, 2000 The target space of a (4,0) supersymmetric two-dimensional sigma model with Wess-Zumino term has a connection with totally skew-symmetric torsion and holonomy contained in Sp(n).Sp(1), QKT-connection. We study the geometry of QKT-connections.
Alekseevsky +35 more
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On curvature properties of Som–Raychaudhuri spacetime [PDF]
, 2015 Som–Raychaudhuri (Proc R Soc Lond A 304:81–86, 1968) spacetime is a stationary cylindrical symmetric solution of Einstein field equation corresponding to a charged dust distribution in rigid rotation.
A. Shaikh, H. Kundu
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Advanced Science, Volume 13, Issue 7, 3 February 2026.This work shows, for the first time, that the stereocilia membrane in cochlear hair cells is dynamically regulated by the mechanotransduction channel to impact the membrane mechanical properties. This work provides direct evidence that the opening and closing associated with the MET channel is regulating the membrane viscosity suggesting that the MET ...
Shefin S. George, Anthony J. Ricci
wiley +1 more source
Stimuli‐Responsive Chemical Systems That Mimic Biological Dynamics
Chemistry – A European Journal, Volume 32, Issue 1, 2 January 2026.Chemists are designing synthetic systems that mimic life's dynamic behaviors, such as motion, sensing, adaptation, and compartmentalization, by integrating reaction networks with stimuli like light, pH, and chemical fuels. This mini‐review surveys molecular machines, responsive materials, nucleic acid networks, and artificial cells, highlighting how ...
Antonio Aguanell +3 more
wiley +1 more source
Isoparametric foliation and a problem of Besse on generalizations of Einstein condition [PDF]
, 2015 The focal sets of isoparametric hypersurfaces in spheres with g = 4 are all Willmore submanifolds, being minimal but mostly non-Einstein ([TY1], [QTY]).
Tang, Zizhou, Yan, Wenjiao
core
Annalen der Physik, Volume 538, Issue 1, January 2026.The BRST invariant Lagrangian of the gravitationally interacting U(1)$U(1)$ gauge theory, namely the Quantum GraviElectro Dynamics (QGED). The Yan–Mills theory with the Hilbert–Einstein gravitational Lagrangian, namely the Yang–Mills–Utiyama (YMU) theory, is defined and quantised using the standard procedure. The theory is perturbatively renormalisable,
Yoshimasa Kurihara
wiley +1 more source
Chronic and acute mediators of passive viscoelasticity in human skeletal muscle fibres
Experimental Physiology, Volume 110, Issue 12, Page 1948-1965, December 1, 2025.Abstract The cellular viscoelastic modulus in skeletal muscle tissue responds dynamically to chronic stressors, such as age and exercise. Passive tissue mechanics can also be sensitive to acute stimuli, such as mechanical loading and/or activation‐induced muscle fatigue.
Grace E. Privett +3 more
wiley +1 more source
On weakly Ricci symmetric lightlike hypersurfaces of indefinite Sasakian manifolds
SUT Journal of Mathematics, 2008 . This paper deals with weakly Ricci-symmetric lightlike hypersurfaces of inde(cid:12)nite Sasakian manifolds, tangent to the structure vector (cid:12)eld. We prove that, in a weakly Ricci symmetric lightlike (cid:17) -Einstein (or Einstein) hypersurface
F. Massamba
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