2,947 research outputs found
One antimatter --- two possible thermodynamics
Conventional thermodynamics, which is formulated for our world populated by
radiation and matter, can be extended to describe physical properties of
antimatter in two mutually exclusive ways: CP-invariant or CPT-invariant. Here
we refer to invariance of physical laws under charge (C), parity (P) and time
reversal (T) transformations. While in quantum field theory CPT invariance is a
theorem confirmed by experiments, the symmetry principles applied to
macroscopic phenomena or to the whole of the Universe represent only
hypotheses. Since both versions of thermodynamics are different only in their
treatment of antimatter, but are the same in describing our world dominated by
matter, making a clear experimentally justified choice between CP invariance
and CPT invariance in context of thermodynamics is not possible at present.
This work investigates the comparative properties of the CP- and CPT-invariant
extensions of thermodynamics (focusing on the latter, which is less
conventional than the former) and examines conditions under which these
extensions can be experimentally tested.Comment: 20 pages, 4 figures. arXiv admin note: text overlap with
arXiv:1209.198
Method for absolute OH--concentration measurements in premixed flames by LIF and numerical simulations
Reaction-Diffusion Manifolds and Global Quasi-linearization: Two Complementary Methods for Mechanism Reduction
The paper outlines the current state in the model reduction of systems governing reacting flows by manifold methods. The main idea of such approaches is based on the fact that any reduced model defines a manifold of low dimension imbedded in the system composition/state space. In this respect the decomposition into relatively fast and slow motions due to multiple time scales present in the system is a crucial property of the reacting system. It allows the application of the geometrical framework of slow and fast invariant manifolds to model reduction. Recently developed approaches, namely, the so-called Reaction-Diffusion Manifolds (REDIMs) and Global-Quasi Linearization (GQL) are in the focus of this work. The methods extend and follow the well known ILDM method. The paper discusses both the theoretical basis of the approaches and detailed implementation schemes for studying, reducing and simulating the reacting flows systems. Simple yet containing all features of the reacting flows models of n-heptane/air and syngas/air systems are used to illustrate and verify the methods
On-demand Generation of Reduced Mechanisms based on Hierarchically Extended Intrinsic Low-Dimensional Manifolds in Generalized coordinates
- …