Kinetic and hydrodynamic regimes in multi-particle-collision dynamics of a one-dimensional fluid with thermal walls

no code implementations • 12 Jan 2021 • Stefano Lepri, Guido Ciraolo, Pierfrancesco Di Cintio, Jamie Gunn, Roberto Livi

We study the non-equilibrium steady-states of a one-dimensional ($1D1V$) fluid in a finite space region of length $L$.

Statistical Mechanics

Symplectic quantization I: dynamics of quantum fluctuations in a relativistic field theory

no code implementations • 6 Jan 2021 • Giacomo Gradenigo, Roberto Livi

We propose here a new symplectic quantization scheme, where quantum fluctuations of a scalar field theory stem from two main assumptions: relativistic invariance and equiprobability of the field configurations with identical value of the action.

Quantization General Relativity and Quantum Cosmology Statistical Mechanics High Energy Physics - Theory

Alfvénic versus non-Alfvénic turbulence in the inner heliosphere as observed by Parker Solar Probe

no code implementations • 4 Jan 2021 • Chen Shi, Marco Velli, Olga Panasenco, Anna Tenerani, Victor Réville, Stuart D. Bale, Justin Kasper, Kelly Korreck, J. W. Bonnell, Thierry Dudok de Wit, David M. Malaspina, Keith Goetz, Peter R. Harvey, Robert J. MacDowall, Marc Pulupa, Anthony W. Case, Davin Larson, J. L. Verniero, Roberto Livi, Michael Stevens, Phyllis Whittlesey, Milan Maksimovic, Michel Moncuquet

We make use of the Parker Solar Probe (PSP) data to explore the nature of solar wind turbulence focusing on the Alfv\'enic character and power spectra of the fluctuations and their dependence on distance and context (i. e. large scale solar wind properties), aiming to understand the role that different effects such as source properties, solar wind expansion, stream interaction might play in determining the turbulent state.

Solar and Stellar Astrophysics Space Physics