9 J ul 2 00 1 Measurement of persistence in 1 - D diffusion
نویسندگان
چکیده
Using a novel NMR scheme we observed persistence in 1-D gas diffusion. Analytical approximations and numerical simulations have indicated that for an initially random array of spins undergoing diffusion, the probability p(t) that the average spin magnetization in a given region has not changed sign (i.e., “persists”) up to time t follows a power law t−θ, where θ depends on the dimensionality of the system. Using laser-polarized Xe gas, we prepared an initial “quasirandom” 1D array of spin magnetization and then monitored the ensemble’s evolution due to diffusion using real-time NMR imaging. Our measurements are consistent with analytical and numerical predictions of θ ≈ 0.12.
منابع مشابه
ar X iv : h ep - p h / 04 07 07 9 v 1 7 J ul 2 00 4 Multi - leg calculations with the GRACE / 1 - LOOP system
متن کامل
Wireless Broadcast with Network Coding: Energy Efficiency, Optimality and Coding Gain in Lossless Wireless Networks
We consider broadcasting in multi-hop wireless networks, in which one source transmits information to all the nodes in the networks. We focus on energy efficiency, or minimizing the total number of transmissions. Our main result is the proof that, from the energy-efficiency perspective, network coding may essentially operate in an optimal way in the core of the network for uniform wireless netw...
متن کاملar X iv : 0 80 7 . 00 58 v 1 [ m at h . D G ] 1 J ul 2 00 8 EQUIVARIANT DIFFERENTIAL CHARACTERS AND SYMPLECTIC REDUCTION
We describe equivariant differential characters (classifying equi-variant circle bundles with connections), their prequantization, and reduction.
متن کامل/ 99 07 00 8 v 1 2 J ul 1 99 9 1 / 4 - BPS states on noncommutative tori
We give an explicit expression for classical 1/4-BPS fields in supersymmetric Yang-Mills theory on noncommutative tori. We use it to study quantum 1/4-BPS states. In particular we calculate the degeneracy of 1/4-BPS energy levels.
متن کاملar X iv : 0 71 0 . 24 70 v 2 [ he p - la t ] 1 J ul 2 00 9 Lattice Approach to Light Scalars
I report on lattice QCD calculations that study the properties of the a0 and f0 mesons.
متن کامل