Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Lower bound on the electroweak wall velocity from hydrodynamic
  instability   The subsonic expansion of bubbles in a strongly first-order electroweak phase
transition is a convenient scenario for electroweak baryogenesis. For most
extensions of the Standard Model, stationary subsonic solutions (i.e.,
deflagrations) exist for the propagation of phase transition fronts. However,
deflagrations are known to be hydrodynamically unstable for wall velocities
below a certain critical value. We calculate this critical velocity for several
extensions of the Standard Model and compare with an estimation of the wall
velocity. In general, we find a region in parameter space which gives stable
deflagrations as well as favorable conditions for electroweak baryogenesis.

7
The categories of this paper are: hep-th
17
The categories of this paper are: q-fin
37
The categories of this paper are: supr-con
26
The categories of this paper are: bayes-an
9
The categories of this paper are: nlin
23
The categories of this paper are: solv-int
16
The categories of this paper are: stat
34
The categories of this paper are: chem-ph
27
The categories of this paper are: comp-gas
33
The categories of this paper are: plasm-ph
12
The categories of this paper are: nucl-th
18
The categories of this paper are: econ
20
The categories of this paper are: acc-phys
19
The categories of this paper are: eess
36
The categories of this paper are: cmp-lg
13
The categories of this paper are: quant-ph