Results 111 to 120 of about 2,997,696 (239)

Ultra-high-Q photonic crystal nanobeam cavity for etchless lithium niobate on insulator (LNOI) platform

open access: yesOpto-Electronic Advances
The expansive spectral coverage and superior optical properties of lithium niobate (LN) offer a comprehensive suite of tools for exploring novel functionalities. Achieving high-quality (Q) photonic resonator cavities is crucial for enhancing light-matter
Zhi Jiang   +10 more
doaj   +1 more source

Noether-Fano Inequalities and Canonical Thresholds on Fano Varieties

open access: yes, 2021
We prove a more general and precise version of the Noether-Fano inequalities for birational maps between Mori fiber spaces. This is applied to give descriptions of global canonical thresholds on Fano varieties of Picard number one.
openaire   +2 more sources

Variétés horosphériques de Fano

open access: yes, 2006
A horospherical variety is a normal algebraic variety where a reductive algebraic group acts with an open orbit which is a torus bundle over a flag variety. The dimension of the torus is called the rank of the horospherical variety.
Pasquier, Boris
core  

The spectrum of Feynman-integral geometries at two loops

open access: yesJournal of High Energy Physics
We provide a complete classification of the Feynman-integral geometries at two-loop order in four-dimensional Quantum Field Theory with standard quadratic propagators.
Piotr Bargieła   +6 more
doaj   +1 more source

Jumping of the nef cone for Fano varieties

open access: yes, 2011
We construct Q \textbf {Q} -factorial terminal Fano varieties, starting in dimension 4, whose nef cone jumps when the variety is deformed.
Burt Totaro
core   +1 more source

Fano Symmetric Varieties with Low Rank

open access: yesPublications of the Research Institute for Mathematical Sciences, 2012
The symmetric projective varieties of rank one are all smooth and Fano by a classical result of Akhiezer. We classify the locally factorial (respectively smooth) projective symmetric G -varieties of rank 2 that are Fano. When
openaire   +3 more sources

Fano configurations in translation planes of large dimension

open access: yes, 2007
It is shown that there are a large variety of André and generalized André planes of large dimension that admit Fano configurations.
Johnson, Norman L.
core   +1 more source

Toric Fano varieties and birational morphisms

open access: yes, 2001
In this paper we study smooth toric Fano varieties using primitive relations and toric Mori theory. We show that for any irreducible invariant divisor D in a toric Fano variety X, we have $0\leqρ_X-ρ_D\leq 3$, for the difference of the Picard numbers of X and D.
openaire   +3 more sources

Categorical Torelli theorems for Fano threefolds [PDF]

open access: yes
The derived category Db(X) of a variety contains a lot of information about X. If X and X′ are Fano, then an equivalence Db(X) ≃ Db(X′) implies that X and X′ are isomorphic.
Jacovskis, Augustinas
core   +1 more source

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