Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Theory of universal incoherent metallic transport   In an incoherent metal, transport is controlled by the collective diffusion
of energy and charge rather than by quasiparticle or momentum relaxation. We
explore the possibility of a universal bound $D \gtrsim \hbar v_F^2/(k_B T)$ on
the underlying diffusion constants in an incoherent metal. Such a bound is
loosely motivated by results from holographic duality, the uncertainty
principle and from measurements of diffusion in strongly interacting
non-metallic systems. Metals close to saturating this bound are shown to have a
linear in temperature resistivity with an underlying dissipative timescale
matching that recently deduced from experimental data on a wide range of
metals. This bound may be responsible for the ubiquitous appearance of high
temperature regimes in metals with $T$-linear resistivity, motivating direct
probes of diffusive processes and measurements of charge susceptibilities.

20
The categories of this paper are: acc-phys
17
The categories of this paper are: q-fin
29
The categories of this paper are: funct-an
21
The categories of this paper are: adap-org
18
The categories of this paper are: econ
16
The categories of this paper are: stat
0
The categories of this paper are: hep-ph
8
The categories of this paper are: hep-ex
35
The categories of this paper are: mtrl-th
32
The categories of this paper are: atom-ph
15
The categories of this paper are: nucl-ex
22
The categories of this paper are: chao-dyn
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The categories of this paper are: bayes-an
11
The categories of this paper are: hep-lat
33
The categories of this paper are: plasm-ph
23
The categories of this paper are: solv-int