Results 61 to 70 of about 1,253 (179)
Weyl, curvature, ricci, and metric tensor symmetries [PDF]
International Journal of Theoretical Physics, 1996 The authors consider Weyl collineations (vector fields \(X\) satisfying \({\mathcal L}_X C^a_{bcd} = 0\) where \(C\) is the Weyl tensor -- the authors use, somewhat unconventionally, the symbol \(W\) for the Weyl tensor) on spacetimes. Many of the results in this short paper are either trivial or known. The authors say that no serious classification of
Bokhari, Ashfaque H. +2 more
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Axially Symmetric-dS Solution in Teleparallel f(T) Gravity Theories
Advances in High Energy Physics, 2015 We apply a tetrad field with six unknown functions to Einstein field equations. Exact vacuum solution, which represents axially symmetric-dS spacetime, is derived.
Gamal G. L. Nashed
doaj +1 more source
Earthquake and Tsunami NaTech Risk Assessment for Oil Storage Facilities
Earthquake Engineering &Structural Dynamics, Volume 55, Issue 9, Page 1887-1904, 25 July 2026.ABSTRACT Interaction of natural and technological hazards (NaTech) events, such as tsunamis and earthquakes, can affect industrial facilities such as those featuring anchored atmospheric storage tanks. Consequences of natural events on this kind of installation may include the release of hazardous substances, which in turn can lead to industrial ...
Georgios Baltzopoulos +6 more
wiley +1 more source
Hyperbolic Gradient-Bourgoignon Flow
پژوهشهای ریاضی, 2022 Introduction Ricci solitons as a generalization of Einstein manifolds introduced by Hamilton in mid 1980s. In the last two decades, a lot of researchers have been done on Ricci solitons.
Hamed Faraji +2 more
doaj
More Than Regulation: Challenging Habermas on the Future of the Public Sphere
Journal of Social Philosophy, EarlyView.
Bernardo Ferro
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Journal of Community Psychology, Volume 54, Issue 5, July 2026.ABSTRACT The Campi Flegrei area, one of the most active volcanic regions in Italy, has faced a prolonged crisis, characterized by recurring seismic events. By adopting a psychosocial and community‐based perspective, this study investigates how seismic and volcanic risk perception, perceived severity, trust in institutions and media, and coping ...
Francesca Mazzella +2 more
wiley +1 more source
On Almost C(α)-Manifold Satisfying Certain Curvature Conditions
Cumhuriyet Science JournalThis research article is about the geometry of the almost C(α)- manifold. Some important properties of the almost C(α)- manifold with respect to the W_3- curvature tensor, such as W_3-flat and W_3- semi-symmetry, are investigated.
Pakize Uygun +2 more
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Consensus on future research directions in the phylum Rotifera
Limnology and Oceanography, Volume 71, Issue 7, July 2026.Abstract Rotifers play key roles in aquatic ecosystems, yet significant uncertainty remains about their diversity and evolution, and further evidence is needed to determine how reliably their responses to global change and human impacts can inform conservation.
Rafael L. Macêdo +17 more
wiley +1 more source
Ricci tensor of real hypersurfaces [PDF]
Pacific Journal of Mathematics, 2016 zbMATH Open Web Interface contents unavailable due to conflicting licenses.
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Four‐Dimensional pp‐Wave Lie Groups and Harmonic Curvature
Mathematische Nachrichten, Volume 299, Issue 7, Page 1751-1780, July 2026.ABSTRACT We determine all four‐dimensional Lie groups which have harmonic curvature. In parallel, a description of four‐dimensional pp‐wave Lie groups is obtained.
E. García‐Río +2 more
wiley +1 more source