Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Holographic Flat Band   We describe a novel implementation of non-relativistic fermions in AdS/CFT by
imposing Lorentz violating boundary conditions for a Dirac spinor in AdS4. The
dual boundary theory is scale invariant and exhibits a number of interesting
properties, including a dispersionless flat band of gapless excitations.

28
The categories of this paper are: alg-geom
5
The categories of this paper are: gr-qc
1
The categories of this paper are: cs
31
The categories of this paper are: ao-sci
10
The categories of this paper are: q-bio
0
The categories of this paper are: hep-ph
27
The categories of this paper are: comp-gas
37
The categories of this paper are: supr-con
22
The categories of this paper are: chao-dyn
2
The categories of this paper are: math
8
The categories of this paper are: hep-ex
15
The categories of this paper are: nucl-ex
6
The categories of this paper are: astro-ph
23
The categories of this paper are: solv-int
24
The categories of this paper are: dg-ga
11
The categories of this paper are: hep-lat