Results 41 to 50 of about 38,678 (149)

A Unifying Approach to Self‐Organizing Systems Interacting via Conservation Laws

Advanced Intelligent Discovery, EarlyView.
The article develops a unified way to model and analyze self‐organizing systems whose interactions are constrained by conservation laws. It represents physical/biological/engineered networks as graphs and builds projection operators (from incidence/cycle structure) that enforce those constraints and decompose network variables into constrained versus ...
F. Barrows, G. Zhang, S. Anand, Z. Chen, J. Lin, A. Desai, S. Martiniani, F. Caravelli   +7 more
wiley   +1 more source

Eisenstein Series in String Theory [PDF]

, 1999
We discuss the relevance of Eisenstein series for representing certain G(Z)-invariant string theory amplitudes which receive corrections from BPS states only.
Antoniadis I, Bachas C, Berkovits N, Berkovits N, Berkovits N, Boris Pioline, Elitzur S, Giveon A, Green M B, Green M B, Green M B, Gregori A, Harish-Chandra, Harvey J A, Hull C M, Kehagias A, Kiritsis E, Kiritsis E, Kiritsis E, Kiritsis E, Kiritsis E, Niels A Obers, Obers N A, Obers N A, Obers N A, Obers N A, Ooguri H, Paban S, Paban S, Pioline B, Townsend P K, Witten E   +31 more
core   +4 more sources

Harnessing Digital Microstructure for Simulation‐Guided Optimization of Permanent Magnets

Advanced Intelligent Discovery, EarlyView.
An experimental‐to‐computational workflow is presented that transforms experimental 3D focused ion beam‐scanning electron microscopy data into a simulation‐ready digital microstructure for multiphase functional materials. Using heavy‐rare‐earth‐free Nd–Fe–B magnets as a model system, the approach quantifies grain connectivity across complex secondary ...
Nikita Kulesh, Anton Bolyachkin, Hajime Nakamura, Tadakatsu Ohkubo, Hossein Sepehri‐Amin   +4 more
wiley   +1 more source

Overtwisted energy-minimizing curl eigenfields

, 2015
We consider energy-minimizing divergence-free eigenfields of the curl operator in dimension three from the perspective of contact topology. We give a negative answer to a question of Etnyre and the first author by constructing curl eigenfields which ...
Arnold V, Bennequin D, Bergery L, Blair D, Chern S S Hamilton R S, Chicone C, Etnyre J, Giroux E, Jost J, Komendarczyk R, Nicolaescu L, Rafal Komendarczyk, Robert Ghrist, Uhlenbeck K, Yoshida Z   +14 more
core   +1 more source

“It Is Much Safer to Be Sparse than Connected”: Safe Control of Robotic Swarm Density Dynamics with PDE Optimization with State Constraints

Advanced Intelligent Systems, EarlyView.
This paper proposes a novel control framework to ensure safety of a robotic swarm. A feedback optimization controller is capable of driving the swarm toward a target density while keeping risk‐zone exposure below a safety threshold. Theory and experiments show how safety is more effectively achieved for sparsely connected swarms.
Longchen Niu, Gennaro Notomista
wiley   +1 more source

A field theory approach to cosmological density perturbations [PDF]

, 2003
Adiabatic perturbations propagate in the expanding universe like scalar massless fields in some effective Robertson-Walker space ...
Andrzej Woszczyna, Bardeen, Bilic, Birrell, Brandenberger, Bruni, Chibisov, Field, Golda, Grishchuk, Lifshitz, Lukash, Lyth, Mukhanov, Olson, Sachs, Stone, Unruh, Unruh, Visser, Woszczyna, Zdzisław A. Golda   +21 more
core   +3 more sources

Supersymmetric IIB Solutions with Schr\"{o}dinger Symmetry

, 2009
We find a class of non-relativistic supersymmetric solutions of IIB supergravity with non-trivial B-field that have dynamical exponent n=2 and are invariant under the Schrodinger group. For a general Sasaki-Einstein internal manifold with U(1)^3 isometry,
, A. Adams, A. Bergman, A. Ceresole, A. Donos, Arnab Kundu, C.P. Herzog, C.P. Herzog, D. Marolf, E.G. Gimon, E.O. Colgain, J. Beckers, J. Maldacena, J.P. Gauntlett, J.P. Gauntlett, J.P. Gauntlett, K. Becker, K. Dasgupta, Krzysztof Pilch, L. Castellani, L. Mazzucato, M. Alishahiha, M. Rangamani, M. Sakaguchi, M. Taylor, N. Bobev, Nikolay Bobev, P. van Nieuwenhuizen, S. Schäfer-Nameki, S.A. Hartnoll, S.A. Hartnoll, S.S. Pal, V.E. Hubeny   +32 more
core   +2 more sources

Multifractional spacetimes, asymptotic safety and Ho\v{r}ava-Lifshitz gravity [PDF]

, 2013
We compare the recently formulated multifractional spacetimes with field theories of quantum gravity based on the renormalization group (RG), such as asymptotic safety and Ho\v{r}ava--Lifshitz gravity.
Calcagni, Gianluca
core   +3 more sources

Gauge invariance and mass gap in (2+1)-dimensional Yang-Mills theory [PDF]

, 1996
In terms of a gauge-invariant matrix parametrization of the fields, we give an analysis of how the mass gap could arise in non-Abelian gauge theories in two spatial dimensions.Comment: 10 pages, Plain TeX, talk presented at the Workshop on Low ...
Karabali, Dimitra, Nair, V. P.
core   +2 more sources

Selective Sequestration of Toxic NOx Gases by P‐Doped Graphene: A Density Functional Theory Study

Advanced Physics Research, EarlyView.
P‐doped graphene (P‐grap) is explored as an NOx sensor through DFT simulations. The analysis of its geometry, binding energies, electronic properties, and atom‐in‐molecule characteristics demonstrates that P‐grap is a selective sensor for NOx among a mixture of various gases.
Anwar Ali, Adnan Ali Khan, Iqtidar Ahmad, Yu‐Jia Zeng   +3 more
wiley   +1 more source