Intheoretical physics, the hypothetical particle called thegraviscalar orradion emerges as an excitation of general relativity'smetric tensor, i.e.gravitational field, but is indistinguishable from ascalar in four dimensions, as shown inKaluza–Klein theory. Thescalar field${\displaystyle \varphi }$ comes from a component of the metric tensor${\displaystyle g_{55}}$ where the figure 5 labels an additionalfifth dimension. The only variations in the scalar field represent variations in the size of the extra dimension. Also, in models with multiple extra dimensions, there exist several such particles. Moreover, in theories withextended supersymmetry, a graviscalar is usually asuperpartner of thegraviton that behaves as a particle withspin 0. This concept closely relates to the gaugedHiggs models.

• Graviphoton (aka gravivector)
• Dilaton
• Kaluza–Klein theory
• Randall–Sundrum models
• Goldberger–Wise mechanism
• List of hypothetical particles

• Roy Maartens, “Brane-World Gravity”, Living Rev. Relativ., 7, (2004), 7.[1],[2]

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