Results 91 to 100 of about 801 (189)

Nonmetric geometric flows and quasicrystalline topological phases for dark energy and dark matter in $$f(Q)$$ f ( Q ) cosmology

European Physical Journal C: Particles and Fields
We elaborate on nonmetric geometric flow theory and metric-affine gravity with applications in modern cosmology. Two main motivations for our research follow from the facts that (1) cosmological models for f(Q) modified gravity theories, MGTs, are ...
Laurenţiu Bubuianu, Erik Nurlan, Julia O. Seti, Sergiu I. Vacaru, Elşen Veli Veliev   +4 more
doaj   +1 more source

Curvature estimates for the Ricci flow I [PDF]

Calculus of Variations and Partial Differential Equations, 2007
In this paper we present several curvature estimates and convergence results for solutions of the Ricci flow. The curvature estimates depend on smallness of certain local space-time integrals of the norm of the Riemann curvature tensor, while the convergence results require finiteness of space-time integrals of the norm of the Riemann curvature tensor.
openaire   +5 more sources

Composition and Provenance of Victoria Group Sandstones in Southern North Victoria Land, Antarctica

New Zealand Journal of Geology and Geophysics, Volume 69, Issue 3, September 2026.
Three distinct source areas contributed to sandstones of the Victoria Group within the Transantarctic Basin in southern North Victoria Land. During the Permian, quartzose sandstones were derived from erosion of the local Ross Orogen, likely from an uplifted swell in the area of today's Ross Sea, the Ross High.
Martin Elsner, Robert Schöner, Reinhard Gaupp, Andreas Kronz, Benjamin Bomfleur, Joerg W. Schneider, Lothar G. Viereck   +6 more
wiley   +1 more source

Singularities of Connection Ricci Flow and Ricci Harmonic Flow

, 2013
In this paper, we study the singularities of two extended Ricci flow systems --- connection Ricci flow and Ricci harmonic flow using newly-defined curvature quantities. Specifically, we give the definition of three types of singularities and their corresponding singularity models, and then prove the convergence. In addition, for Ricci harmonic flow, we
openaire   +2 more sources

An introduction to conformal Ricci flow [PDF]

Classical and Quantum Gravity, 2004
52 pages, 1 ...
openaire   +3 more sources

More Than Regulation: Challenging Habermas on the Future of the Public Sphere

Journal of Social Philosophy, EarlyView.
Bernardo Ferro
wiley   +1 more source

Early neurodevelopmental outcome in newborns with mild hypoxic‐ischaemic encephalopathy

Developmental Medicine &Child Neurology, Volume 68, Issue 9, Page 1261-1268, September 2026.
Abstract Aim To describe the natural history of newborn children with mild hypoxic‐ischaemic encephalopathy in the first year of life. Method This was a multicentre, prospective observational study involving five neonatal intensive care units in an Italian region using both structured clinical and neurophysiological assessments according to the Italian
Domenico M. Romeo, Chiara Arpaia, Angelo Di Malta, Elisa Pede, Grazia Maria Cicala, Daniela Ricci, Francesca Serrao, Eugenio Mercuri, Claudia Brogna, Mild Encephalopathy Regional Network*, Giovanni Vento, Chiara Cafforio, Eleonora Scapillati, Roberta Arena, Francesca Gallini, Vita Augusta, Andrea Guzzetta   +16 more
wiley   +1 more source

SmartTur+ECO: A Multimodal Conversational Recommender System Integrating Virtual Reality and Gamification for Smart Tourism

Expert Systems, Volume 43, Issue 9, September 2026.
ABSTRACT This paper presents SmartTur+ECO, a system for tourist attractions that integrates conversational recommendation systems (CRS), virtual reality (VR) and gamification. It efficiently gathers trip data and elicits user preferences through interactions with a chatbot, addressing the user‐cold start problem common in tourism.
Juan Carlos Carrillo, Victoria Beltran, Laura Sebastia, Eva Onaindia, Ignacio Seguí, Alfonso Lopez, Jose Carlos Sola   +6 more
wiley   +1 more source

Surface subgroups for cocompact lattices of isometries of H2n$\mathbb {H}^{2n}$

Journal of Topology, Volume 19, Issue 3, September 2026.
Abstract We prove the existence of surface subgroups within any cocompact lattice Γ$\Gamma$ in SO(2n,1)$\mathrm{SO}(2n,1)$ for n⩾2$n\geqslant 2$. This result addresses the cases missing from the work of Hamenstädt in 2015, who constructed surface subgroups in cocompact lattices for all other rank‐1 simple Lie groups of noncompact type.
Jeremy Kahn, Zhenghao Rao
wiley   +1 more source

Invariant Measure and Universality of the 2D Yang–Mills Langevin Dynamic

Communications on Pure and Applied Mathematics, Volume 79, Issue 8, Page 1973-2102, August 2026.
ABSTRACT We prove that the Yang–Mills (YM) measure for the trivial principal bundle over the two‐dimensional torus, with any connected, compact structure group, is invariant for the associated renormalised Langevin dynamic. Our argument relies on a combination of regularity structures, lattice gauge‐fixing and Bourgain's method for invariant measures ...
Ilya Chevyrev, Hao Shen
wiley   +1 more source