Results 41 to 50 of about 1,975 (257)
An Overview on the Nature of the Bounce in LQC and PQM
Universe, 2021 We present a review on some of the basic aspects concerning quantum cosmology in the presence of cut-off physics as it has emerged in the literature during the last fifteen years.
Gabriele Barca +2 more
doaj +1 more source
Opportunities of Semiconducting Oxide Nanostructures as Advanced Luminescent Materials in Photonics
Advanced Materials, EarlyView.The review discusses the challenges of wide and ultrawide bandgap semiconducting oxides as a suitable material platform for photonics. They offer great versatility in terms of tuning microstructure, native defects, doping, anisotropy, and micro‐ and nano‐structuring. The review focuses on their light emission, light‐confinement in optical cavities, and
Ana Cremades +7 more
wiley +1 more source
Comparing equivalent gravities: common features and differences
European Physical Journal C: Particles and Fields, 2022 We discuss equivalent representations of gravity in the framework of metric-affine geometries pointing out basic concepts from where these theories stem out.
Salvatore Capozziello +2 more
doaj +1 more source
Cosmological Particle Production in Quantum Gravity
Universe, 2021 Quantum theory of a test field on a quantum cosmological spacetime may be viewed as a theory of the test field on an emergent classical background.
Yaser Tavakoli
doaj +1 more source
Asymptotically Euclidean Bianchi IX metrics in quantum gravity
Physics Letters B, 1978 We present a class of exact self-dual metrics of Bianchi IX type with all directions unequal. Although asymptotically Euclidean they may not be considered as gravitational instantons since they contain singularities. This accords with the Positive Action Conjecture.
V.A. Belinskii +3 more
openaire +1 more source
Clinical and Laboratory Characterization of Acquired Von Willebrand Syndrome
American Journal of Hematology, EarlyView.ABSTRACT Acquired von Willebrand Syndrome (AVWS) is a rare bleeding disorder characterized by quantitative or qualitative defects of von Willebrand factor (VWF) in patients without a personal or family history of bleeding. It is frequently associated with systemic diseases, particularly lymphoproliferative disorders (LPDs) and myeloproliferative ...
Alessandro Ciavarella +10 more
wiley +1 more source
Ricci Flow of Biaxial Bianchi IX Metrics
, 2007 We use the Ricci flow with surgery to study four-dimensional SU(2) x U(1)-symmetric metrics on a manifold with fixed boundary given by a squashed 3-sphere. Depending on the initial metric we show that the flow converges to either the Taub-Bolt or the Taub-NUT metric, the latter case potentially requiring surgery at some point in the evolution.
Holzegel, G., Schmelzer, T., Warnick, C.
openaire +2 more sources
Journal of Applied Polymer Science, EarlyView.Microwave‐assisted alcoholysis converts EVA into EVAOH terpolymers, promoting a progressive transition from EVA‐like crystallites to VOH‐rich hydrogen‐bonded crystalline domains. Solvent‐controlled swelling influences conversion kinetics, while thermal analysis reveals a sigmoidal increase in melting temperature that a two‐population crystallization ...
Fernanda Trindade Gonzalez Dias +3 more
wiley +1 more source
and Models: A Self-Similar Approach
Journal of Mathematics, 2013 We study the models and their particular case, the so-called -models under the self-similarity hypothesis. In particular, we calculate the exact form that each quantity may take in order that field equations (FEs) admit self-similar solutions.
José Antonio Belinchón
doaj +1 more source
Bianchi IX self-dual Einstein metrics and singular G 2 manifolds [PDF]
Classical and Quantum Gravity, 2003 We construct explicit cohomogeneity two metrics of G_2 holonomy, which are foliated by twistor spaces. The twistor spaces are S^2 bundles over four-dimensional Bianchi IX Einstein metrics with self-dual (or anti-self-dual) Weyl tensor. Generically the 4-metric is of triaxial Bianchi IX type, with SU(2) isometry.
Cvetic, M. +3 more
openaire +4 more sources