Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The evolution of white dwarfs with a varying gravitational constant   Within the theoretical framework of some modern unification theories the
constants of nature are functions of cosmological time. White dwarfs offer the
possibility of testing a possible variation of G and, thus, to place
constraints to these theories. We present full white dwarf evolutionary
calculations in the case that G decreases with time. White dwarf evolution is
computed in a self-consistent way, including the most up-to-date physical
inputs, non-gray model atmospheres and a detailed core chemical composition
that results from the calculation of the full evolution of progenitor stars. We
find that the mechanical structure and the energy balance of white dwarfs are
strongly modified by the presence of a varying G. In particular, for certain
values of the rate of change of G, the evolution of cool white dwarfs is
markedly affected. The impact of a varying G is more notorious in the case of
more massive white dwarfs. In view of the recent results reporting that a very
accurate white dwarf cooling age can be derived for the old and metal-rich open
cluster NGC 6791, our study suggests that this cluster could be a potential
target to constrain or detect a ypothetical secular variation of G.

17
The categories of this paper are: q-fin
30
The categories of this paper are: q-alg
1
The categories of this paper are: cs
19
The categories of this paper are: eess
16
The categories of this paper are: stat
14
The categories of this paper are: math-ph
3
The categories of this paper are: physics
10
The categories of this paper are: q-bio
12
The categories of this paper are: nucl-th
26
The categories of this paper are: bayes-an
8
The categories of this paper are: hep-ex
11
The categories of this paper are: hep-lat
37
The categories of this paper are: supr-con
20
The categories of this paper are: acc-phys
32
The categories of this paper are: atom-ph
18
The categories of this paper are: econ