Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Identical quantum particles as distinguishable objects   According to classical physics particles are basic building blocks of the
world. Classical particles are distinguishable objects, individuated by
physical characteristics. By contrast, in quantum mechanics the standard view
is that particles of the same kind ("identical particles") are in all
circumstances indistinguishable from each other. This indistinguishability
doctrine is motivated by the (anti)symmetrization postulates together with the
assumption (``factorism'') that each single particle is represented in exactly
one factor space in the tensor product Hilbert space of a many-particles
system.
  Although the factorist assumption is standard in the literature, it is
conceptually problematic. Particle indistinguishability is incompatible with
the everyday meaning of ``particle'', and also with how this term is used both
in classical physics and in the experimental practice of physics. The standard
view requires quantum particles of the same kind to remain indistinguishable
even in the classical limit, so that a transition to the classical picture of
the world seems impossible.
  Earlier we have proposed an alternative conception of quantum particles that
does not rely on factorism and that avoids these and other problems. We further
explain and develop this proposal here. In our view, particles in quantum
theory are not fundamental but \emph{emergent}. However, in those situations
where the particle concept is applicable, quantum particles---identical or
not---are distinguishable in the same way as classical particles.

28
The categories of this paper are: alg-geom
35
The categories of this paper are: mtrl-th
20
The categories of this paper are: acc-phys
23
The categories of this paper are: solv-int
7
The categories of this paper are: hep-th
19
The categories of this paper are: eess
12
The categories of this paper are: nucl-th
1
The categories of this paper are: cs
6
The categories of this paper are: astro-ph
31
The categories of this paper are: ao-sci
27
The categories of this paper are: comp-gas
17
The categories of this paper are: q-fin
33
The categories of this paper are: plasm-ph
4
The categories of this paper are: cond-mat
3
The categories of this paper are: physics
14
The categories of this paper are: math-ph