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Is gravity the weakest force?
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DOI：10.1088/1361-6382/abc524.png)
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It has recently been suggested that 'gravity is the weakest force' in any theory with a suitable UV completion within quantum gravity. One formulation of this statement is the scalar weak gravity conjecture (WGC), which states that gravity is weaker than the force originating from scalar fields. We study the scalar WGC in de Sitter (dS) space, and discuss its low-energy consequences in light of the experimental searches for fifth forces and violations of the equivalence principle. We point out that some versions of the scalar WGC forbid the existence of very light scalar particles, such as the quintessence and axion-like particles. The absence of the quintessence field means that these versions of the scalar WGC are in phenomenological tension with the recently-proposed dS swampland conjecture and its refinements. Some other versions of the scalar WGC escape these constraints, and could have interesting phenomenological consequences.
Keyword:
quantum gravity
swampland conjectures
scalar weak gravity conjecture
期刊
IF:
3.7
论文数:
1.3W
被引数:
3.0W
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