Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A quantum solution to the arrow-of-time dilemma   The arrow of time dilemma: the laws of physics are invariant for time
inversion, whereas the familiar phenomena we see everyday are not (i.e. entropy
increases). I show that, within a quantum mechanical framework, all phenomena
which leave a trail of information behind (and hence can be studied by physics)
are those where entropy necessarily increases or remains constant. All
phenomena where the entropy decreases must not leave any information of their
having happened. This situation is completely indistinguishable from their not
having happened at all. In the light of this observation, the second law of
thermodynamics is reduced to a mere tautology: physics cannot study those
processes where entropy has decreased, even if they were commonplace.

28
The categories of this paper are: alg-geom
24
The categories of this paper are: dg-ga
16
The categories of this paper are: stat
12
The categories of this paper are: nucl-th
4
The categories of this paper are: cond-mat
3
The categories of this paper are: physics
5
The categories of this paper are: gr-qc
1
The categories of this paper are: cs
23
The categories of this paper are: solv-int
20
The categories of this paper are: acc-phys
0
The categories of this paper are: hep-ph
25
The categories of this paper are: patt-sol
31
The categories of this paper are: ao-sci
18
The categories of this paper are: econ
30
The categories of this paper are: q-alg
10
The categories of this paper are: q-bio