Results 21 to 30 of about 299,137 (271)

Quantum singularities

open access: yesPhysical Review D, 2023
Two spatial regions $B$ and $R$ are hyperentangled if the generalized entropy satisfies $S_{\text{gen}}^{B\cup R}
Raphael Bousso, Arvin Shahbazi-Moghaddam
openaire   +2 more sources

Numerical solution of Cauchy problems with multiple poles of integer order

open access: yesDiscrete and Continuous Models and Applied Computational Science, 2022
We consider Cauchy problem for ordinary differential equation with solution possessing a sequence of multiple poles. We propose the generalized reciprocal function method.
Aleksandr A. Belov, Nikolay N. Kalitkin
doaj   +1 more source

On singularities of real algebraic sets and applications to kinematics

open access: yesOpen Mathematics, 2020
We address the question of identifying non-smooth points in Vℝ(I){{\bf{V}}}_{{\mathbb{R}}}(I) the real part of an affine algebraic variety. Two simple algebraic criteria will be formulated and proven.
Diesse Marc
doaj   +1 more source

The Borg’s Theorem for Singular Sturm-Liouville Problem with Non-Separated Boundary Conditions [PDF]

open access: yesMathematics Interdisciplinary Research, 2023
‎In this paper‎, ‎we consider a Sturm-Liouville equation with non-separated boundary conditions on a finite interval‎. ‎We discuss some properties of solutions of the Sturm-Liouville equation‎, ‎where the potential function has a singularity in the ...
Maedeh Bagherzadeh, Abdolali Neamaty
doaj   +1 more source

Complete intersection singularities of splice type as universal abelian covers [PDF]

open access: yes, 2004
It has long been known that every quasi-homogeneous normal complex surface singularity with Q-homology sphere link has universal abelian cover a Brieskorn complete intersection singularity.
Eisenbud   +7 more
core   +5 more sources

Singular inflation [PDF]

open access: yesPhysical Review D, 2015
We prove that a homogeneous and isotropic universe containing a scalar field with a power-law potential, $V( )=A ^{n}$, with $00$ always develops a finite-time singularity at which the Hubble rate and its first derivative are finite, but its second derivative diverges.
Barrow, John D, Graham, Alexander AH
openaire   +3 more sources

Classical Collapse to Black Holes and Quantum Bounces: A Review

open access: yesUniverse, 2017
In the last four decades, different programs have been carried out aiming at understanding the final fate of gravitational collapse of massive bodies once some prescriptions for the behaviour of gravity in the strong field regime are provided.
Daniele Malafarina
doaj   +1 more source

Probing graphene’s nonlocality with singular metasurfaces

open access: yesNanophotonics, 2020
Singular graphene metasurfaces, conductivity gratings realized by periodically suppressing the local doping level of a graphene sheet, were recently proposed to efficiently harvest THz light and couple it to surface plasmons over broad absorption bands ...
Galiffi Emanuele   +4 more
doaj   +1 more source

Classical and Quantum Strings in plane waves, shock waves and spacetime singularities: synthesis and new results [PDF]

open access: yes, 2003
Key issues of classical and quantum strings in gravitational plane waves, shock waves and spacetime singularities are synthetically understood. This includes the string mass and mode number excitations, energy-momentum tensor, scattering amplitudes ...
Sanchez, Norma G.
core   +3 more sources

Some Examples of Calculation of Massless and Massive Feynman Integrals

open access: yesParticles, 2021
We show some examples of calculations of massless and massive Feynman integrals.
Anatoly V. Kotikov
doaj   +1 more source

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