Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Massive Gravity from Higher Derivative Gravity with Boundary Conditions   With an appropriate choice of parameters, a higher derivative theory of
gravity can describe a normal massive sector and a ghost massless sector. We
show that, when defined on an asymptotically de Sitter spacetime with Dirichlet
boundary conditions, such a higher derivative gravity can provide a framework
for a unitary theory of massive gravity in four spacetime dimensions. The
resulting theory is free not only of higher derivative ghosts but also of the
Boulware-Deser mode.

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The categories of this paper are: econ
11
The categories of this paper are: hep-lat
32
The categories of this paper are: atom-ph
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The categories of this paper are: math-ph
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The categories of this paper are: adap-org
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The categories of this paper are: alg-geom
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The categories of this paper are: comp-gas
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The categories of this paper are: patt-sol
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The categories of this paper are: nlin
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The categories of this paper are: chao-dyn
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The categories of this paper are: astro-ph
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The categories of this paper are: cmp-lg
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The categories of this paper are: acc-phys
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The categories of this paper are: eess
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The categories of this paper are: hep-ex
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The categories of this paper are: mtrl-th