Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Scanning the Fluxless $G_2$ Landscape   We show that there exists an exponentially large discretuum of vacua in
$G_2$-compactifications of M-theory without flux. In M-theory-inspired
$G_2$-MSSM, quantities relevant for particle physics remain virtually
insensitive to large variations of the vacuum energy across the landscape. The
purely non-perturbative vacua form a special subset of a more general class of
vacua containing fractional Chern-Simons contributions. The cosmological
constant can be dynamically neutralized via a chain of transitions interpolated
by fractional gauge instantons describing spontaneous nucleation of M2-brane
domain walls. Each transition is generically accompanied by a gauge symmetry
breaking in some sector of the theory. In particular, the visible sector GUT
symmetry breaking can likewise be triggered by a spontaneous nucleation of an
M2-brane.

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The categories of this paper are: comp-gas
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The categories of this paper are: nucl-th
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The categories of this paper are: q-bio
5
The categories of this paper are: gr-qc
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The categories of this paper are: plasm-ph
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The categories of this paper are: supr-con
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The categories of this paper are: q-alg
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The categories of this paper are: atom-ph
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The categories of this paper are: hep-ex
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The categories of this paper are: mtrl-th
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The categories of this paper are: math
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The categories of this paper are: astro-ph
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The categories of this paper are: q-fin
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The categories of this paper are: cond-mat
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The categories of this paper are: stat
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The categories of this paper are: patt-sol