Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Drop deformation by laser-pulse impact   A free-falling absorbing liquid drop hit by a nanosecond laser-pulse
experiences a strong recoil-pressure kick. As a consequence, the drop propels
forward and deforms into a thin sheet which eventually fragments. We study how
the drop deformation depends on the pulse shape and drop properties. We first
derive the velocity field inside the drop on the timescale of the pressure
pulse, when the drop is still spherical. This yields the kinetic-energy
partition inside the drop, which precisely measures the deformation rate with
respect to the propulsion rate, before surface tension comes into play. On the
timescale where surface tension is important the drop has evolved into a thin
sheet. Its expansion dynamics is described with a slender-slope model, which
uses the impulsive energy-partition as an initial condition. Completed with
boundary integral simulations, this two-stage model explains the entire drop
dynamics and its dependance on the pulse shape: for a given propulsion, a
tightly focused pulse results in a thin curved sheet which maximizes the
lateral expansion, while a uniform illumination yields a smaller expansion but
a flat symmetric sheet, in good agreement with experimental observations.

37
The categories of this paper are: supr-con
31
The categories of this paper are: ao-sci
34
The categories of this paper are: chem-ph
22
The categories of this paper are: chao-dyn
9
The categories of this paper are: nlin
28
The categories of this paper are: alg-geom
14
The categories of this paper are: math-ph
33
The categories of this paper are: plasm-ph
18
The categories of this paper are: econ
12
The categories of this paper are: nucl-th
24
The categories of this paper are: dg-ga
4
The categories of this paper are: cond-mat
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The categories of this paper are: eess
21
The categories of this paper are: adap-org
5
The categories of this paper are: gr-qc
26
The categories of this paper are: bayes-an