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キーワード:
High Energy Physics - Theory, hep-th
要旨:
The Ward identities involving the currents associated to the spontaneously
broken scale and special conformal transformations are derived and used to
determine, through linear order in the two soft-dilaton momenta, the
double-soft behavior of scattering amplitudes involving two soft dilatons and
any number of other particles. It turns out that the double-soft behavior is
equivalent to performing two single-soft limits one after the other. We confirm
the new double-soft theorem perturbatively at tree-level in a $D$-dimensional
conformal field theory model, as well as nonperturbatively by using the
"gravity dual'' of ${\cal{N}}=4$ super Yang-Mills on the Coulomb branch; i.e.
the Dirac-Born-Infeld action on AdS${}_5 \times S^5$.
