Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Differences between the trajectory representation and Copenhagen
  regarding the past and present in quantum theory   We examine certain pasts and presents in the classically forbidden region. We
show that for a given past the trajectory representation does not permit some
presents while the Copenhagen predicts a finite probability for these presents
to exist. This suggests another gedanken experiment to invalidate either
Copenhagen or the trajectory representation.

22
The categories of this paper are: chao-dyn
33
The categories of this paper are: plasm-ph
37
The categories of this paper are: supr-con
5
The categories of this paper are: gr-qc
17
The categories of this paper are: q-fin
32
The categories of this paper are: atom-ph
23
The categories of this paper are: solv-int
30
The categories of this paper are: q-alg
1
The categories of this paper are: cs
2
The categories of this paper are: math
35
The categories of this paper are: mtrl-th
19
The categories of this paper are: eess
18
The categories of this paper are: econ
9
The categories of this paper are: nlin
34
The categories of this paper are: chem-ph
24
The categories of this paper are: dg-ga