Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A discrete energy space induced fermion parity breaking fixed point of
  the Kondo model   In this work we combine the well established Kondo problem with the more
speculative field of a discrete space time. We show that a discrete energy
space induces a flow towards a new fixed point by breaking the conservation of
charge and spin and lifting the fermion parity. This parity lifting fixed point
appears on a scale set by the discretization of energy space. In contrast to
the Planck scale the associated energy scale is at very low energy scales,
possibly given by the inverse size of the universe.

10
The categories of this paper are: q-bio
11
The categories of this paper are: hep-lat
27
The categories of this paper are: comp-gas
8
The categories of this paper are: hep-ex
22
The categories of this paper are: chao-dyn
35
The categories of this paper are: mtrl-th
29
The categories of this paper are: funct-an
25
The categories of this paper are: patt-sol
31
The categories of this paper are: ao-sci
18
The categories of this paper are: econ
37
The categories of this paper are: supr-con
17
The categories of this paper are: q-fin
24
The categories of this paper are: dg-ga
21
The categories of this paper are: adap-org
36
The categories of this paper are: cmp-lg
33
The categories of this paper are: plasm-ph