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Dark energy, Ricci-nonflat spaces, and the Swampland

Luis A. Anchordoqui, Ignatios Antoniadis, Dieter Lust, Jorge F. Soriano

Abstract

It was recently pointed out that the existence of dark energy imposes highly restrictive constraints on effective field theories that satisfy the Swampland conjectures. We provide a critical confrontation of these constraints with the cosmological framework emerging from the Salam-Sezgin model and its string realization by Cvetic, Gibbons, and Pope. We also discuss the implication of the constraints for string model building.

Dark energy, Ricci-nonflat spaces, and the Swampland

Abstract

It was recently pointed out that the existence of dark energy imposes highly restrictive constraints on effective field theories that satisfy the Swampland conjectures. We provide a critical confrontation of these constraints with the cosmological framework emerging from the Salam-Sezgin model and its string realization by Cvetic, Gibbons, and Pope. We also discuss the implication of the constraints for string model building.

Paper Structure

This paper contains 4 equations, 1 figure.

Figures (1)

  • Figure 1: Left. The 95%CL upper limit on $w_Y(z) = w_0 + w_a z/(1+z)$ based on SNe Ia, CMB and BAO data. Following Agrawal:2018own, the limit is determined from Fig. 5 in DiValentino:2020evt by finding the values of ($w_0,w_a$) all along the 95%CL contour, plotting all $w_Y(z)$, and finding the upper hull. Right. A comparison between the 95% CL upper limit derived in the left panel and various predictions for the Salam-Sezgin-Cvetič-Gibbons-Pope model.