Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Standard Model Compactifications from Intersecting Branes   We discuss the construction of four dimensional non-supersymmetric models
obtained from configurations of D6-branes intersecting at angles. We present
the first examples of string GUT models which break exactly to the Standard
Model (SM) at low energy. Even though the models are non supersymmetric (SUSY),
the demand that some open string sectors preserve N=1 SUSY creates gauge
singlet scalars that break the extra anomaly free U(1)'s generically present in
the models, predicting $s{\tilde \nu}_R$'s and necessarily creating Majorana
mass terms for right handed neutrinos.

23
The categories of this paper are: solv-int
4
The categories of this paper are: cond-mat
17
The categories of this paper are: q-fin
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The categories of this paper are: stat
12
The categories of this paper are: nucl-th
5
The categories of this paper are: gr-qc
34
The categories of this paper are: chem-ph
24
The categories of this paper are: dg-ga
33
The categories of this paper are: plasm-ph
31
The categories of this paper are: ao-sci
10
The categories of this paper are: q-bio
25
The categories of this paper are: patt-sol
37
The categories of this paper are: supr-con
6
The categories of this paper are: astro-ph
8
The categories of this paper are: hep-ex
11
The categories of this paper are: hep-lat