Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Realism and causality I: Pilot wave and retrocausal models as possible
  facilitators   Of all basic principles of classical physics, realism should arguably be the
last to be given up when seeking a better interpretation of quantum mechanics.
We examine the de Broglie-Bohm pilot wave theory as a well developed example of
a realistic theory. We present three challenges to a naive reading of
pilot-wave theory, each based on a system of several entangled particles. With
the help of a coarse graining of pilot wave theory into a discrete system, we
show how these challenges can be answered. However this comes with a cost. In
the description of individual systems, particles appear to scatter off empty
branches of the wave function as if they were particles, and conversely travel
through particles as if they were waves. More generally, the "particles" of
pilot wave theory are led by the guidance equation to move in ways no classical
particle would, involving apparent violations of the principles of inertia and
momentum conservation.We next argue that the aforementioned cost can be avoided
within a retrocausal model. In the proposed version of the pilot wave theory,
the particle is guided by a combination of advanced and retarded waves. The
resulting account for quantum physics seems to have greater heuristic power, it
demands less damage to intuition, and moreover provides some general hints
regarding spacetime and causality. This is the first of two papers. In the
second [1] we show that, in the context of an explicit model, retrocausality,
with respect to an effective, emergent spacetime metric, can coexist with a
strict irreversibility of causal processes.

10
The categories of this paper are: q-bio
22
The categories of this paper are: chao-dyn
8
The categories of this paper are: hep-ex
32
The categories of this paper are: atom-ph
1
The categories of this paper are: cs
14
The categories of this paper are: math-ph
3
The categories of this paper are: physics
35
The categories of this paper are: mtrl-th
17
The categories of this paper are: q-fin
30
The categories of this paper are: q-alg
12
The categories of this paper are: nucl-th
6
The categories of this paper are: astro-ph
25
The categories of this paper are: patt-sol
16
The categories of this paper are: stat
34
The categories of this paper are: chem-ph
23
The categories of this paper are: solv-int