Results 31 to 40 of about 479,657 (292)

On the geometrical interpretation of scale-invariant models of inflation

Physics Letters B, 2016
We study the geometrical properties of scale-invariant two-field models of inflation. In particular, we show that when the field-derivative space in the Einstein frame is maximally symmetric during inflation, the inflationary predictions can be universal
Georgios K. Karananas, Javier Rubio
doaj   +1 more source

Comments on D-branes in Kazama-Suzuki models and Landau-Ginzburg theories [PDF]

, 2001
We study D-branes in Kazama-Suzuki models by means of the boundary state description. We can identify the boundary states of Kazama-Suzuki models with the solitons in N=2 Landau-Ginzburg theories.
A. Giveon, A. Giveon, A. Giveon, C. Vafa, D. Gepner, E. Witten, H. Ishikawa, J. Maldacena, K. Gaw`edzki, K. Hori, K. Sugiyama, K.A. Intriligator, Masatoshi Nozaki, N. Ishibashi, O. Aharony, P. Di Francesco, S. Cecotti, S. Fredenhagen, S. Mizoguchi, W. Lerche   +19 more
core   +3 more sources

Geometrical constraints on dark energy models

, 2007
This contribution intends to give a pedagogical introduction to the topic of dark energy (the mysterious agent supposed to drive the observed late time acceleration of the Universe) and to various observational tests which require only assumptions on the
Luis Manuel Montaño, Mauricio Carbajal, Omar Miranda, Oscar Rosas-Ortiz, Ruth Lazkoz, Sergio A. Tomas Velazquez   +5 more
core   +1 more source

Geometric models of Helium [PDF]

Modern Physics Letters A, 2017
A previous paper [M. F. Atiyah and N. S. Manton, arXiv:1609.02816 ] modeled atoms and their isotopes by complex algebraic surfaces with the projective plane modeling Hydrogen. In this paper, models of the stable isotopes Helium-4 and Helium-3 are constructed.
openaire   +2 more sources

Modeling Realistic Geometries in Human Intrathoracic Airways

Diagnostics
Geometrical models of the airways offer a comprehensive perspective on the complex interplay between lung structure and function. Originating from mathematical frameworks, these models have evolved to include detailed lung imagery, a crucial enhancement ...
Francesca Pennati, Lorenzo Aliboni, Andrea Aliverti   +2 more
doaj   +1 more source

Detecting dynamical patterns in pedestrian bottlenecks Koopman-based quantification of crowd dynamics [PDF]

EPJ Web of Conferences
What properties characterize a bottleneck through which pedestrians are walking? Using Koopman theory, we analyze simulated bottleneck scenarios for their underlying geometrical components.
Kern Sabrina, Eberhard Michael, Köster Gerta   +2 more
doaj   +1 more source

POPULATING A LIBRARY OF REUSABLE H-BOMS: ASSESSMENT OF A FEASIBLE IMAGE BASED MODELING WORKFLOW [PDF]

The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, 2017
The paper shows the intermediate results of a research activity aimed at populating a library of reusable Historical Building Object Models (H-BOMs) by testing a full digital workflow that takes advantages from using Structure from Motion (SfM) models ...
C. Santagati, M. Lo Turco, G. D’Agostino   +2 more
doaj   +1 more source

Extended Gauge Invariance in Geometrical Particle Models and the Geometry of W-Symmetry [PDF]

, 1995
We prove that particle models whose action is given by the integrated $n$-th curvature function over the world line possess $n+1$ gauge invariances. A geometrical characterization of these symmetries is obtained via Frenet equations by rephrasing the $n$-
Alonso, Ambjøm, Batlle, Batlle, De Boer, Eduardo Ramos, Figueroa-O'Farrill, Figueroa-O'Farrill, Gervais, Gervais, Gomis, Govindarajan, Gràcia, Hull, Jaume Roca, Pisarski, Plyushchay, Plyushchay, Polyakov, Radul, Radul, Ramos, Schoutens, Sotkov, Sotkov, Spivak, Su, Sudarshan, Zamolodchikov, Zoller   +29 more
core   +2 more sources

Emergent lattices with geometrical frustration in doped extended Hubbard models

, 2016
Spontaneous charge ordering occurring in correlated systems may be considered as a possible route to generate effective lattice structures with unconventional couplings.
Gros, Claudius, Kaneko, Ryui, Tocchio, Luca F., Valentí, Roser   +3 more
core   +1 more source

Cornea modelling

Eye and Vision, 2020
Background Biomechanics introduces numerous technologies to support clinical practice in ophthalmology, with the goal of improving surgical outcomes and to develop new advanced technologies with minimum impact on clinical training.
Anna Pandolfi
doaj   +1 more source