Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: New fermionic soft theorems   Soft limits of massless S-matrix are known to reflect symmetries of the
theory. In particular for theories with Goldstone bosons, the double-soft limit
of scalars reveals the coset structure of the vacuum manifold. In this letter,
we propose that such universal double-soft behavior is not only true for
scalars, but also for spin-1/2 particles in four dimensions and fermions in
three dimensions. We first consider Akulov-Volkov theory, and demonstrate the
double soft-limit of goldstinos yields the supersymmetry algebra. More
surprisingly we also find amplitudes in 3<N<=8 supergravity theories in four
dimensions as well as N=16 supergravity in three dimensions behave universally
in the double-soft-fermion limit, analogue to the scalar ones. The validity of
the new soft theorems at loop level is also studied. The results for
supergravity are beyond what is implied by SUSY Ward identities, and may impose
non-trivial constraints on the possible counter terms for supergravity
theories.

19
The categories of this paper are: eess
11
The categories of this paper are: hep-lat
23
The categories of this paper are: solv-int
31
The categories of this paper are: ao-sci
12
The categories of this paper are: nucl-th
32
The categories of this paper are: atom-ph
14
The categories of this paper are: math-ph
30
The categories of this paper are: q-alg
9
The categories of this paper are: nlin
21
The categories of this paper are: adap-org
8
The categories of this paper are: hep-ex
2
The categories of this paper are: math
24
The categories of this paper are: dg-ga
5
The categories of this paper are: gr-qc
15
The categories of this paper are: nucl-ex
35
The categories of this paper are: mtrl-th