Description
A central lesson of the swampland program in quantum gravity is that ultraviolet and infrared regimes may be intertwined in subtle and nontrivial ways. This UV/IR mixing can have significant implications for low-energy gravitational effective field theories. Building on recent bounds that explicitly realize such mixing, I will derive new constraints on inflationary models, and also establish a relation between the number of extra spacetime dimensions and the tensor-to-scalar ratio. The implications of these bounds will be discussed.