Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quantum Weak Measurements and Cosmology   The indeterminism of quantum mechanics generally permits the independent
specification of both an initial and a final condition on the state. Quantum
pre-and-post-selection of states opens up a new, experimentally testable,
sector of quantum mechanics, when combined with statistical averages of
identical weak measurements. In this paper I apply the theory of weak quantum
measurements combined with pre-and-post-selection to cosmology. Here,
pre-selection means specifying the wave function of the universe or, in a
popular semi-classical approximation, the initial quantum state of a subset of
quantum fields propagating in a classical back-ground spacetime. The novel
feature is post-selection: the additional specification of a condition on the
quantum state in the far future. I discuss "natural" final conditions, and show
how they may lead to potentially large and observable effects at the present
cosmological epoch. I also discuss how pre-and-post-selected quantum contrast
to the expectation value of the stress-energy-momentum tensor, resolving a
vigorous debate from the 1970's. The paper thus provides a framework for
computing large-scale cosmological effects arising from this new sector of
quantum mechanics. A simple experimental test is proposed.

26
The categories of this paper are: bayes-an
20
The categories of this paper are: acc-phys
8
The categories of this paper are: hep-ex
36
The categories of this paper are: cmp-lg
22
The categories of this paper are: chao-dyn
35
The categories of this paper are: mtrl-th
16
The categories of this paper are: stat
10
The categories of this paper are: q-bio
18
The categories of this paper are: econ
23
The categories of this paper are: solv-int
24
The categories of this paper are: dg-ga
4
The categories of this paper are: cond-mat
0
The categories of this paper are: hep-ph
6
The categories of this paper are: astro-ph
27
The categories of this paper are: comp-gas
5
The categories of this paper are: gr-qc