Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Routing Schemes and Distance Oracles in the Hybrid Model   The $\mathsf{HYBRID}$ model was introduced as a means for theoretical study
of distributed networks that use various communication modes. Conceptually, it
is a synchronous message passing model with a local communication mode, where
in each round each node can send large messages to all its neighbors in a local
network (a graph), and a global communication mode, where each node is allotted
limited (polylogarithmic) bandwidth per round which it can use to communicate
with any node in the network.
  Prior work has often focused on shortest paths problems in the local network,
as their global nature makes these an interesting case study how combining
communication modes in the $\mathsf{HYBRID}$ model can overcome the individual
lower bounds of either mode. In this work we consider a similar problem, namely
computation of distance oracles and routing schemes. In the former, all nodes
have to compute local tables, which allows them to look up the distance
(estimates) to any target node in the local network when provided with the
label of the target. In the latter, it suffices that nodes give the next node
on an (approximately) shortest path to the target.
  Our goal is to compute these local tables as fast as possible with labels as
small as possible. We show that this can be done exactly in $\widetilde
O(n^{1/3})$ communication rounds and labels of size $\Theta(n^{2/3})$ bits. For
constant stretch approximations we achieve labels of size $O(\log n)$ in the
same time. Further, as our main technical contribution, we provide
computational lower bounds for a variety of problem parameters. For instance,
we show that computing solutions with stretch below a certain constant takes
$\widetilde \Omega(n^{1/3})$ rounds even for labels of size $O(n^{2/3})$.

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The categories of this paper are: cmp-lg
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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: eess
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The categories of this paper are: cond-mat
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The categories of this paper are: q-fin
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The categories of this paper are: chao-dyn
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The categories of this paper are: dg-ga
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The categories of this paper are: econ
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The categories of this paper are: astro-ph
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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: comp-gas
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The categories of this paper are: q-bio
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The categories of this paper are: nucl-ex
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The categories of this paper are: chem-ph