Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Chameleonic equivalence postulate and wave function collapse   A chameleonic solution to the cosmological constant problem and the
non-equivalence of different conformal frames at the quantum level have been
recently suggested [Phys. Rev. D82 (2010) 044006]. In this article we further
discuss the theoretical grounds of that model and we are led to a chameleonic
equivalence postulate (CEP). Whenever a theory satisfies our CEP (and some
other additional conditions), a density-dependence of the mass of matter fields
is naturally present. Let us summarize the main results of this paper. 1) The
CEP can be considered the microscopic counterpart of the Einstein's Equivalence
Principle and, hence, a chameleonic description of quantum gravity is obtained:
in our model, (quantum) gravitation is equivalent to a conformal anomaly. 2) To
illustrate one of the possible applications of the CEP, we point out a
connection between chameleon fields and quantum-mechanical wave function
collapse. The collapse is induced by the chameleonic nature of the theory. We
discuss the collapse for a Stern-Gerlach experiment and for a diffraction
experiment with electrons. More research efforts are necessary to verify
whether these ideas are compatible with phenomenological constraints.

23
The categories of this paper are: solv-int
24
The categories of this paper are: dg-ga
33
The categories of this paper are: plasm-ph
0
The categories of this paper are: hep-ph
18
The categories of this paper are: econ
10
The categories of this paper are: q-bio
22
The categories of this paper are: chao-dyn
7
The categories of this paper are: hep-th
16
The categories of this paper are: stat
6
The categories of this paper are: astro-ph
20
The categories of this paper are: acc-phys
32
The categories of this paper are: atom-ph
19
The categories of this paper are: eess
35
The categories of this paper are: mtrl-th
17
The categories of this paper are: q-fin
34
The categories of this paper are: chem-ph