Results 21 to 30 of about 4,856 (294)
Regular Solutions in Higher-Derivative Gravity
Universe, 2018 Local gravitational theories with more than four derivatives can have remarkable quantum properties. Namely, they can be super-renormalizable and may be unitary in the Lee-Wick sense, if the massive poles of the propagator are complex.
Breno L. Giacchini +1 more
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On Generation, Motions, and Collisions of Dowsons
Frontiers in Physics, 2020 Dowsons are ±2π point singularities of the unitary complex order parameter eiφ characterizing the so-called dowser texture in a thin nematic layer with homeotropic boundary conditions.
Pawel Pieranski, Maria Helena Godinho
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Complex-time singularity and locality estimates for quantum lattice systems [PDF]
Journal of Mathematical Physics, 2015 We present and prove a well-known locality bound for the complex-time dynamics of a general class of one-dimensional quantum spin systems. Then we discuss how one might hope to extend this same procedure to higher dimensions using ideas related to the Eden growth process and lattice trees. Finally, we demonstrate with a specific family of lattice trees
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Nonlocal vertices and analyticity: Landau equations and general Cutkosky rule
Journal of High Energy Physics, 2018 We study the analyticity properties of amplitudes in theories with nonlocal vertices of the type occurring in string field theory and a wide class of nonlocal field theory models.
Paokuan Chin, E. T. Tomboulis
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Frontiers in Physics, 2022 Atomic gases tightly trapped near the focus of an electromagnetic wave interact with photons that exhibit a complex structure, displaying strong gradients of field amplitude and local polarization that can lead to topological phase singularities.
R. Gutiérrez-Jáuregui, R. Jáuregui
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Scientific Reports, 2022 Irregular spatial distribution of photon transmission through a photochromic crystal photoisomerized by a local optical near-field excitation was previously reported, which manifested complex branching processes via the interplay of material deformation ...
Kazuharu Uchiyama +8 more
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Sharp Focusing of a Hybrid Vector Beam with a Polarization Singularity
Photonics, 2021 The key result of this work is the use of the global characteristics of the polarization singularities of the entire beam as a whole, rather than the analysis of local polarization, Stokes and Poincare–Hopf indices.
Victor V. Kotlyar +2 more
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The local analytical triviality of a complex analytic singular foliation
Hokkaido Mathematical Journal, 2004 The authors investigate complex analytic singular foliations defined on the complex analytic manifold \(M\) of dimension \(n\). After recalling basic notions of the theory of singular foliations they prove a theorem about local analytic triviality along the leaves. The main tool of the proof is the Whitney stratification of the singular locus. The last
MITERA, Yoshiki, YOSHIZAKI, Junya
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Singularities (hybrid meeting)
, 2021 Singularity theory concerns local and global structure of singularities of (algebraic) varieties and maps.
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Application of singularity theory and logistic regression model for tungsten polymetallic potential mapping [PDF]
Nonlinear Processes in Geophysics, 2013 Geo-anomalies with complex structures in the earth's crust may be defined as preferable hydrothermal ore-forming targets. The separation and explanation of anomaly from geological background have a profound influence on the analysis of geological ...
Y. Liu, Q. Xia, Q. Cheng, X. Wang
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