Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Fluid Clocks: Emergence of quantum theory from sub-quantum dynamics   It is argued that any operational measure of time is inseparably bound to the
presence of a periodic process in some medium. Since, as first formulated by
Einstein's (1905) equation for the energy, all "particles" (neutrons,
electrons, photons, etc.) are each characterized by a specific "frequency", the
inverse of this frequency is the smallest operational unit of time available in
principle. With a corresponding "coarse graining" of an otherwise practically
idealized, continuous time (i.e., with the latter then holding on time scales
much larger than the coarse grained one), one can show that the basic features
of quantum theory can be derived from a minimal set of assumptions. In
particular, it is shown here how the Schroedinger equation can be derived from
classical physics modified only by said assumption of a coarse grained time and
the presence of so-called "zero-point fluctuations". The latter relate to the
dynamics of a "fluid" vacuum, which is today known to be a far cry from just
being "empty space". Consequently, it is shown that time and matter, when
discussed from a physical point of view, must by necessity be considered in one
common framework.

27
The categories of this paper are: comp-gas
15
The categories of this paper are: nucl-ex
22
The categories of this paper are: chao-dyn
26
The categories of this paper are: bayes-an
28
The categories of this paper are: alg-geom
24
The categories of this paper are: dg-ga
8
The categories of this paper are: hep-ex
0
The categories of this paper are: hep-ph
35
The categories of this paper are: mtrl-th
3
The categories of this paper are: physics
14
The categories of this paper are: math-ph
16
The categories of this paper are: stat
37
The categories of this paper are: supr-con
32
The categories of this paper are: atom-ph
7
The categories of this paper are: hep-th
17
The categories of this paper are: q-fin