Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Supernovae Ia in 2019 (review): a rising demand for spherical explosions   I review new studies of type Ia supernovae (SNe Ia) from 2019, and use these
to improve the comparison between the five binary SN Ia scenarios. New low
polarisation measurements solidify the claim that most SN Ia explosions are
globally spherically symmetric (clumps are possible). Explosions by dynamical
processes, like explosions that take place during a merger process of two white
dwarfs (WDs) in the double degenerate (DD) scenario, or during an accretion
process in the double detonation (DDet) scenario and in the single degenerate
(SD) scenario, lead to non-spherical explosions, in contradiction with
observations of normal SNe Ia. I argue that these (DD, DDet, SD) scenarios
account mainly for peculiar SNe Ia. The explosion of a Chandrasekhar mass (Mch)
WD (deflagration to detonation process) has a global spherical structure that
is compatible with observations. To reach spherical explosions, SN Ia scenarios
should allow for a time delay between the formation of an Mch-WD and its
explosion. As such, I split the DD scenario to a channel without merger to
explosion delay (MED) time (that forms mainly peculiar SNe Ia), and a channel
with a MED, the DD-MED channel (scenario). I speculate that the main
contributors to normal SNe Ia are the core degenerate (CD) scenario, the DD-MED
scenario, both have Mch spherical explosions, and the DD scenario that has
sub-Mch non-spherical explosions.

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The categories of this paper are: bayes-an
4
The categories of this paper are: cond-mat
13
The categories of this paper are: quant-ph
35
The categories of this paper are: mtrl-th
7
The categories of this paper are: hep-th
9
The categories of this paper are: nlin
20
The categories of this paper are: acc-phys
3
The categories of this paper are: physics
22
The categories of this paper are: chao-dyn
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The categories of this paper are: atom-ph
34
The categories of this paper are: chem-ph
8
The categories of this paper are: hep-ex
5
The categories of this paper are: gr-qc
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The categories of this paper are: alg-geom
37
The categories of this paper are: supr-con
11
The categories of this paper are: hep-lat