Results 21 to 30 of about 4,951 (263)
Singularity in classical and quantum Kepler problem with weak anisotropy [PDF]
Physics Letters A, 2002 Anisotropic Kepler problem is investigated by perturbation method in both classical and quantum mechanics. In classical mechanics, due to the singularity of the potential, global diffusion in phase space occurs at an arbitrarily small perturbation parameter.
Bai, Zaiqiao, Zheng, Weimou
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Boundary value problems with displacement for one mixed hyperbolic equation of the second order
Қарағанды университетінің хабаршысы. Математика сериясы, 2023 The paper studies two nonlocal problems with a displacement for the conjugation of two equations of second-order hyperbolic type, with a wave equation in one part of the domain and a degenerate hyperbolic equation of the first kind in the other part. As
Zh.A. Balkizov
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Quantum dress for a naked singularity
Physics Letters B, 2016 We investigate semiclassical backreaction on a conical naked singularity space–time with a negative cosmological constant in (2+1)-dimensions. In particular, we calculate the renormalized quantum stress–energy tensor for a conformally coupled scalar ...
Marc Casals +3 more
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Periodic solution for prescribed mean curvature Rayleigh equation with a singularity
Advances in Difference Equations, 2020 In this paper, we consider the existence of a periodic solution for a prescribed mean curvature Rayleigh equation with singularity (weak and strong singularities of attractive type or weak and strong singularities of repulsive type).
Yun Xin, Guixin Hu
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Charged BTZ black holes cannot be destroyed via the new version of the gedanken experiment
European Physical Journal C: Particles and Fields, 2021 The singularity at the center of charged Bañados–Teitelboim–Zanelli (BTZ) black holes is called a conical singularity. Unlike the canonical singularity in typical black holes, a conical singularity does not destroy the causality of spacetime.
Xin-Yang Wang, Jie Jiang
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Journal of Function Spaces, 2021 We study the existence of positive solutions for second-order nonlinear repulsive singular difference systems with periodic boundary conditions. Our nonlinearity may be singular in its dependent variable.
Shengjun Li, Fang Zhang
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Boundary Value Problems, 2020 The main purpose of this paper is to investigate the existence of a positive periodic solution for a prescribed mean curvature generalized Liénard equation with a singularity (weak and strong singularities of attractive type, or weak and strong ...
Yun Xin, Zhibo Cheng
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Plane waves with weak singularities [PDF]
Journal of High Energy Physics, 2003 We study a class of time dependent solutions of the vacuum Einstein equations which are plane waves with weak null singularities. This singularity is weak in the sense that though the tidal forces diverge at the singularity, the rate of divergence is such that the distortion suffered by a freely falling observer remains finite. Among such weak singular
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Pediatric Blood &Cancer, EarlyView.ABSTRACT Background Pediatric cancer remains a leading cause of morbidity and mortality worldwide, particularly in low‐and middle‐income countries. Cancer treatment may impair nutritional status, alter body composition, and exacerbate cancer‐related fatigue (CRF).
Luís Carlos Lopes‐Junior +11 more
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Electronic Journal of Qualitative Theory of Differential EquationsWe prove the existence of at least one positive periodic solution for a second-order damped nonlinear differential equation with an indefinite singularity by assuming the corresponding linear equation have a positive Green's function.
Xueliang Zhou, Qinghong Zhang
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