Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Why there is something so close to nothing: towards a fundamental theory
  of the cosmological constant   The cosmological constant problem is turned around to argue for a new
foundational physics postulate underlying a consistent quantum theory of
gravity and matter, such as string theory. This postulate is a quantum
equivalence principle which demands a consistent gauging of the geometric
structure of canonical quantum theory. We argue that string theory can be
formulated to accommodate such a principle, and that in such a theory the
observed cosmological constant is a fluctuation about a zero value. This
fluctuation arises from an uncertainty relation involving the cosmological
constant and the effective volume of spacetime. The measured, small vacuum
energy is dynamically tied to the large size of the universe, thus violating
naive decoupling between small and large scales. The numerical value is related
to the scale of cosmological supersymmetry breaking, supersymmetry being needed
for a non-perturbative stability of local Minkowski spacetime regions in the
classical regime.

25
The categories of this paper are: patt-sol
21
The categories of this paper are: adap-org
36
The categories of this paper are: cmp-lg
26
The categories of this paper are: bayes-an
29
The categories of this paper are: funct-an
9
The categories of this paper are: nlin
11
The categories of this paper are: hep-lat
27
The categories of this paper are: comp-gas
18
The categories of this paper are: econ
30
The categories of this paper are: q-alg
17
The categories of this paper are: q-fin
37
The categories of this paper are: supr-con
20
The categories of this paper are: acc-phys
4
The categories of this paper are: cond-mat
0
The categories of this paper are: hep-ph
31
The categories of this paper are: ao-sci