such couplings
61Faddeev–Popov ghost — In physics, Faddeev Popov ghosts (also called ghost fields) are additional fields which need to be introduced in the realization of gauge theories as consistent quantum field theories. There is also a more general meaning of the word ghost in… …
62truck — truck1 truckable, adj. /truk/, n. 1. any of various forms of vehicle for carrying goods and materials, usually consisting of a single self propelled unit but also often composed of a trailer vehicle hauled by a tractor unit. 2. any of various… …
63Coaches of the Great Western Railway — A Travelling Post Office coach The passenger coaches of the Great Western Railway (GWR) were many and varied, ranging from four and six wheeled vehicles for the original broad gauge line of 1838, through to bogie coaches up to 70 feet (21 m) …
64Hierarchy problem — In theoretical physics, a hierarchy problem occurs when the fundamental parameters (couplings or masses) of some Lagrangian are vastly different (usually larger) than the parameters measured by experiment. This can happen because measured… …
65Double switching — A single switched relay can close inadvertently in response to a single false feed current. A double switched relay cannot close inadvertently with the application of the same current. At least two separate faults would be required to allow this… …
66Stueckelberg action — In field theory, the Stueckelberg action (named after Ernst Stueckelberg) describes a massive spin 1 field as a R (the real numbers are the Lie algebra of U(1)) Yang Mills theory coupled to a real scalar field φ which takes on values in a real 1D …
67Victorian Railways Z vans — Infobox Train background = name = Z van imagesize = 300px caption = Van 611 ZD, in storage at the Seymour Railway Heritage Centre interior interiorcaption = Manufacturer = Victorian Railways Factory = Newport Workshops, others Family = Built =… …
68PEPPSI — Not to be confused with Pepsi. General structure of PEPPSI catalysts. R stands for a small organic fragment. PEPPSI is an abbreviation for pyridine enhanced precatalyst preparation stabilization and initiation. It refers to a group of chemical… …
69Trackless train — Not to be confused with road train. A trackless train in Tenerife A trackless train (or land train, parking lot tram, Dotto train, Tschu Tschu train or Thomas) is a road going articulated vehicle used for the transport of passengers, comprising a …
70Isospin — In physics, and specifically, particle physics, isospin ( isotopic spin , isobaric spin ) is a quantum number related to the strong interaction. This term was derived from isotopic spin , but the term isotopic spin is confusing as two isotopes of …
