Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Soft photon theorems from CFT Ward identites in the flat limit of
  AdS/CFT   S-matrix elements in flat space can be obtained from a large AdS-radius limit
of certain CFT correlators. We present a method for constructing CFT operators
which create incoming and outgoing scattering states in flat space. This is
done by taking the flat limit of bulk operator reconstruction techniques. Using
this method, we obtain explicit expressions for incoming and outgoing U(1)
gauge fields. Weinberg soft photon theorems then follow from Ward identites of
conserved CFT currents. In four bulk dimensions, gauge fields on AdS can be
quantized with standard and alternative boundary conditions. Changing the
quantization scheme corresponds to the S-transformation of SL(2,Z)
electric-magnetic duality in the bulk. This allows us to derive both, the
electric and magnetic soft photon theorems in flat space from CFT physics.

10
The categories of this paper are: q-bio
24
The categories of this paper are: dg-ga
22
The categories of this paper are: chao-dyn
9
The categories of this paper are: nlin
8
The categories of this paper are: hep-ex
28
The categories of this paper are: alg-geom
17
The categories of this paper are: q-fin
13
The categories of this paper are: quant-ph
1
The categories of this paper are: cs
15
The categories of this paper are: nucl-ex
32
The categories of this paper are: atom-ph
0
The categories of this paper are: hep-ph
4
The categories of this paper are: cond-mat
6
The categories of this paper are: astro-ph
20
The categories of this paper are: acc-phys
33
The categories of this paper are: plasm-ph