Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Placing the Sun in Galactic Chemical Evolution: Mainstream SiC Particles   We examine the consequences and implications of the possibility that the
best-fit $m$=4/3 line of the silicon isotopic ratios measured in mainstream SiC
grains is identical or parallel to to the mean ISM evolution line of the
silicon isotopes. Even though the mean ISM evolution proceeds along a line of
unity slope when deviations are expressed in terms of the native representation
(the mean ISM), the evolution line can become a slope 4/3 line in the solar
representation, provided that the solar composition is displaced from the mean
ISM evolution. During the course of this analysis, we introduce new methods for
relating the solar composition to that of the mean ISM at the time of solar
birth. These new developments offer a unique view on the meaning of the
mainstream SiC particles, and affords a new way of quantitatively answering the
question whether the sun has a special composition relative to the mean ISM at
solar birth. If the correlation slope of the silicon isotopes in the mean ISM
could be decisively established, then its value would quantify the difference
between the solar and mean ISM silicon abundances. Our formalism details the
transformations between the two representations, and applies not only to
$^{29}$Si and $^{30}$Si, but to any two purely secondary isotopes of any
element (O, Ne, Mg, and perhaps S). Both the advantages and disadvantages of
this technique are critically reviewed.

31
The categories of this paper are: ao-sci
4
The categories of this paper are: cond-mat
22
The categories of this paper are: chao-dyn
7
The categories of this paper are: hep-th
26
The categories of this paper are: bayes-an
2
The categories of this paper are: math
36
The categories of this paper are: cmp-lg
13
The categories of this paper are: quant-ph
1
The categories of this paper are: cs
9
The categories of this paper are: nlin
27
The categories of this paper are: comp-gas
5
The categories of this paper are: gr-qc
16
The categories of this paper are: stat
21
The categories of this paper are: adap-org
28
The categories of this paper are: alg-geom
24
The categories of this paper are: dg-ga