Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The early dynamical evolution of cool, clumpy star clusters   Observations and theory both suggest that star clusters form sub-virial
(cool) with highly sub-structured distributions. We perform a large ensemble of
N-body simulations of moderate-sized (N=1000) cool, fractal clusters to
investigate their early dynamical evolution. We find that cool, clumpy clusters
dynamically mass segregate on a short timescale, that Trapezium-like massive
higher-order multiples are commonly formed, and that massive stars are often
ejected from clusters with velocities > 10 km/s (c.f. the average escape
velocity of 2.5 km/s). The properties of clusters also change rapidly on very
short timescales. Young clusters may also undergo core collapse events, in
which a dense core containing massive stars is hardened due to energy losses to
a halo of lower-mass stars. Such events can blow young clusters apart with no
need for gas expulsion. The warmer and less substructured a cluster is
initially, the less extreme its evolution.

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The categories of this paper are: supr-con
8
The categories of this paper are: hep-ex
9
The categories of this paper are: nlin
10
The categories of this paper are: q-bio
24
The categories of this paper are: dg-ga
16
The categories of this paper are: stat
5
The categories of this paper are: gr-qc
33
The categories of this paper are: plasm-ph
28
The categories of this paper are: alg-geom
21
The categories of this paper are: adap-org
22
The categories of this paper are: chao-dyn
27
The categories of this paper are: comp-gas
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The categories of this paper are: mtrl-th
19
The categories of this paper are: eess
25
The categories of this paper are: patt-sol
13
The categories of this paper are: quant-ph