Results 51 to 60 of about 16,119 (189)
, 2015 Making use of a set of detailed potential models for normal spiral galaxies, we analyze the disk stellar orbital dynamics as the structural and dynamical parameters of the spiral arms (mass, pattern speed and pitch angle) are gradually modified.
Moreno, Edmundo +2 more
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Formulation Of Quantum Mechanics On Poincaré Disks
, 2021 The unexploited unification of general relativity and quantum mechanics (QM) prevents the proper understanding of the micro- and macroscopic world. Here we put forward a mathematical approach that introduces the problem in terms of negative curvature manifolds.
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Degree theory for 4‐dimensional asymptotically conical gradient expanding solitons
Communications on Pure and Applied Mathematics, Volume 79, Issue 5, Page 1151-1298, May 2026.Abstract We develop a new degree theory for 4‐dimensional, asymptotically conical gradient expanding solitons. Our theory implies the existence of gradient expanding solitons that are asymptotic to any given cone over S3$S^3$ with non‐negative scalar curvature. We also obtain a similar existence result for cones whose link is diffeomorphic to S3/Γ$S^3/\
Richard H. Bamler, Eric Chen
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Fortschritte der Physik, Volume 74, Issue 4, April 2026.Abstract String theory has strong implications for cosmology, implying the absence of a cosmological constant, ruling out single‐field slow‐roll inflation, and that black holes decay. The origins of these statements are elucidated within the string‐theoretical swampland programme.
Kay Lehnert
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Revista Brasileira de Ensino de FísicaA basic introduction to the su(1,1) algebra is presented, in which we discuss the relation with canonical transformations, the realization in terms of quantized radiation field modes and coherent states.
Marcel Novaes
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On topological restrictions of the spacetime in cosmology
, 2012 In this paper we discuss the restrictions of the spacetime for the standard model of cosmology by using results of the differential topology of 3- and 4-manifolds. The smoothness of the cosmic evolution is the strongest restriction.
Asselmeyer-Maluga, T., Krol, J.
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Probability Distributions attached to generalised Bergman Spaces on the Poincar�� Disk
, 2010 A family of probability distributions attached to a class of generalized weighted Bergman spaces on the Poincar disk are introduced by constructing a kind of generalized coherent states. Their main statistical parameters are obtained explicitly. As application, photon number statistics related to coherent states under consideration are discussed.
Askour, Nour Eddine, Mouayn, Zouhair
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Generalized Second Bargmann Transforms Associated with the Hyperbolic Landau Levels on the Poincaré Disk [PDF]
Annales Henri Poincaré, 2011 We deal with a family of generalized coherent states associated to the hyperbolic Landau levels of the Schr dinger operator with uniform magnetic field on the Poincar disk. Their associated coherent state transforms constitute a class of generalized second Bargmann transforms.
El Wassouli, Fouzia +3 more
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Nonlinear Analysis: Real World Applications, 2023 We consider the Neumann--Poincar operator on a planar domain enclosed by two touching circular boundaries. This domain, which is a crescent-shaped domain or touching disks, has a cusp at the touching point of two circles. We analyze the operator via the Fourier transform on the boundary circles of the domain.
Younghoon Jung, Mikyoung Lim
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On the Euler characteristic of S$S$‐arithmetic groups
Journal of the London Mathematical Society, Volume 113, Issue 3, March 2026.Abstract We show that the sign of the Euler characteristic of an S$S$‐arithmetic subgroup of a simple algebraic group depends on the S$S$‐congruence completion only, except possibly in type 6D4${}^6 D_4$. Consequently, the sign is a profinite invariant for such S$S$‐arithmetic groups with the congruence subgroup property. This generalizes previous work
Holger Kammeyer, Giada Serafini
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