Results 61 to 70 of about 15,120 (245)

The return of the four- and five-dimensional preons

, 2007
We prove the existence of 3/4-BPS preons in four- and five-dimensional gauged supergravities by explicitly constructing them as smooth quotients of the AdS_4 and AdS_5 maximally supersymmetric backgrounds, respectively.
Bandos I A, Cacciatori S L, Figueroa-O'Farrill J M, Figueroa-O'Farrill J M, Figueroa-O'Farrill J M, Figueroa-O'Farrill J M, Figueroa-O'Farrill J M, Figueroa-O'Farrill J M Leitner F Simón J, Gran U Gutowski J Papadopoulos G Roest D, Gran U Gutowski J Papadopoulos G Roest D, Grover J, Grover J Gutowski J Sabra W, Harvey F, Jan Gutowski, José Figueroa-O'Farrill, Kath I, Lawson H, Simón J, Wafic Sabra   +18 more
core   +1 more source

The d’Alembert solution in hyperboloidal foliations

General Relativity and Gravitation
AbstractWe explicitly construct the analogue of the d’Alembert solution to the 1+1 wave equation in an hyperboloidal setting. This hyperboloidal d’Alembert solution is used, in turn, to gain intuition into the behaviour of solutions to the wave equation in a hyperboloidal foliation and to explain an apparently anomalous permanent displacement of the ...
Valiente Kroon, Juan A., Gomes Da Silva, Lidia J.   +1 more
openaire   +3 more sources

Efficient Robust Spontaneous Parametric Down‐Conversion via Detuning Modulated Composite Segments Designs

Laser &Photonics Reviews, Volume 20, Issue 5, 6 March 2026.
Detuning modulated composite segmentation (DMCS) enables robust spontaneous parametric down‐conversion with sevenfold improved temperature stability compared to conventional designs, opening new possibilities for stable quantum photon sources. ABSTRACT Spontaneous parametric down conversion (SPDC) holds a pivotal role in quantum physics, facilitating ...
Muhammad Erew, Yuval Reches, Ofir Yesharim, Moshe Goldstein, Ady Arie, Haim Suchowski   +5 more
wiley   +1 more source

Provable properties of asymptotic safety in f(R) approximation

Journal of High Energy Physics, 2022
We study an f(R) approximation to asymptotic safety, using a family of non-adaptive cutoffs, kept general to test for universality. Matching solutions on the four-dimensional sphere and hyperboloid, we prove properties of any such global fixed point ...
Alex Mitchell, Tim R. Morris, Dalius Stulga   +2 more
doaj   +1 more source

Fourier and Gegenbauer expansions for a fundamental solution of the Laplacian in the hyperboloid model of hyperbolic geometry

, 2012
Due to the isotropy $d$-dimensional hyperbolic space, there exist a spherically symmetric fundamental solution for its corresponding Laplace-Beltrami operator.
Abramowitz M, Andrews G E, Beltrami E, Bers L, Byrd P F, Cohl H S, Cohl H S, Cohl H S, E G Kalnins, Erdélyi A, Erdélyi A, Fano U, Folland G B, Fox L, Gilbarg D, Gradshteyn I S, Grigor’yan A A, Grigor’yan A A, Grigor’yan A A, H S Cohl, Helgason S, Izmest’ev A A, Kalnins E G, Lee J M, Livio M, Losev A G, Magnus W, Morse P M, Olevskii˘ M N, Olver F W J, Olver F W J, Schoen R, Thurston W P, Trudeau R J, Vilenkin N Ja   +34 more
core   +2 more sources

Tunable Core–Shell Metal Alloy Pillar Design in Vertically Aligned Nanostructures Toward Multifunctionality

Small Science, Volume 6, Issue 3, March 2026.
Core–shell alloy‐based BaTiO3/Au–Cu–Co–Ni vertically aligned nanocomposites exhibit tunable nanopillar morphologies governed by interfacial energetics. A temperature–time–transformation diagram predicts nanopillar evolution, while structure–property relationships link morphology with controllable optical anisotropy, hyperbolic dispersion, magnetic ...
Abhijeet Choudhury, Benson Kunhung Tsai, Ping Lu, D. Hermawan, Lizabeth Quigley, Jialong Huang, Zedong Hu, Jeremy Gan, Natalia Garcia Godinez, James P. Barnard, Bharat Giri, A. Sanjuan, César Martínez‐Sánchez, Xiaoshan Xu, R. Edwin García, Haiyan Wang   +15 more
wiley   +1 more source

Dynamical Ambiguities in Singular Gravitational Field

, 1997
We consider particle dynamics in singular gravitational field. In 2d spacetime the system splits into two independent gravitational systems without singularity.
George Jorjadze, Jackiw R, Jorjadze G, Kirillov A A, Reed M, Seiberg N, Wlodzimierz Piechocki, Zhelobenko D P   +7 more
core   +1 more source

On Asymptotic Flatness and Lorentz Charges

, 2011
In this paper we establish two results concerning four-dimensional asymptotically flat spacetimes at spatial infinity. First, we show that the six conserved Lorentz charges are encoded in two unique, distinct, but mutually dual symmetric divergence free ...
Compère, Geoffrey, Dehouck, François, Virmani, Amitabh   +2 more
core   +1 more source

Terahertz Volume Plasmon‐Polariton Modulation in All‐Dielectric Hyperbolic Metamaterials

Advanced Optical Materials, Volume 14, Issue 7, 16 February 2026.
THz volume plasmon‐polariton (VPP) propagation through plasmon‐based hyperbolic metamaterials, made of alternating layers of doped and undoped III‐V semiconductors. Abstract The development of plasmonics and related applications in the terahertz range faces limitations due to the intrinsic high electron density of the standard metals.
Stefano Campanaro, Luca Bursi, Stefano Curtarolo, Arrigo Calzolari   +3 more
wiley   +1 more source

Rigidity of anti‐de Sitter (2+1)‐spacetimes with convex boundary near the Fuchsian locus

Journal of the London Mathematical Society, Volume 113, Issue 2, February 2026.
Abstract We prove that globally hyperbolic compact anti‐de Sitter (2+1)‐spacetimes with a strictly convex spacelike boundary that is either smooth or polyhedral and whose holonomy is close to Fuchsian are determined by the induced metric on the boundary.
Roman Prosanov, Jean‐Marc Schlenker
wiley   +1 more source