Quintessence Axion Revisited in Light of Swampland Conjectures
  We point out that the swampland conjectures, forbidding the presence of
global symmetries and (meta-)stable de Sitter vacua within quantum gravity,
pick up a dynamical axion for the electroweak SU(2) gauge theory as a natural
candidate for the quintessence field. The potential energy of the electroweak
axion provides an attractive candidate for the dark energy. We discuss
constraints from the weak gravity conjecture, from the conjecture of no global
symmetry, and from observations, which can be satisfied elegantly in a
supersymmetric extension of the standard model.
