出典:Wiktionary
出典:『Wiktionary』 (2008/11/28 18:10 UTC 版)
gravitational and scalar.
出典:Wikipedia
出典:『Wikipedia』 (2011/02/12 12:59 UTC 版)
In theoretical physics, a graviscalar (also known as a radion) is a hypothetical particle that emerges as an excitation of the metric tensor (i.e. gravitational field) but whose physical properties are virtually indistinguishable from a scalar in four dimensions, as shown in Kaluza-Klein theory. The new scalar field φ comes from a component of the metric tensor g55 where the figure 5 labels an additional, fifth dimension. It can be thought of as a measure of the size of the extra dimension, with variations in the scalar field representing variations in the size of the extra dimensions.