We revisit the effective low-energy dynamics of the volume modulus in warped
flux compactifications with anti-D3-branes in order to analyze the prospects
for meta-stable de Sitter vacua and brane inflation along the lines of
KKLT/KKLMMT. At the level of the 10d supergravity solution, anti-branes in flux
backgrounds with opposite charge are known to source singular terms in the
energy densities of the bulk fluxes, which led to a debate on the consistency
of such constructions in string theory. A straightforward yet non-trivial check
of the singular solution is to verify that its dimensional reduction in the
large-volume limit reproduces the 4d low-energy dynamics expected from known
results where the anti-branes are treated as a probe. Taking into account the
anti-brane backreaction in the effective scalar potential, we find that both
the volume scaling and the coefficient of the anti-brane uplift term are in
exact agreement with the probe potential if the singular fluxes satisfy a
certain near-brane boundary condition. This condition can be tested explicitly
and may thus help to decide whether flux singularities should be interpreted as
pathological or benign features of flux compactifications with anti-branes.
Throughout the paper, we also comment on a number of subtleties related to the
proper definition of warped effective field theory with anti-branes.Comment: 10 pages. v2: comments adde
