supervirial

From super- +‎ virial.

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supervirial (not comparable)

1. (physics) Expanding at an accelerating rate.
   • 2008, Johan Hendrik Knapen, T. J. Mahoney, Alexandre Vazdekis, Pathways Through an Eclectic Universe, page 6:

     For example, the 0.5-2 Myr old Orion Nebula Cluster ( ONC ), which is known to be supervirial with a virial mass about twice the observed mass ( Hillenbrand & Hartmann 1998 ), has already expelled its residual gas and is expanding rapidly.

   • 2010, Mark Gieles, “Star Cluster Disruption”, in Richard de Grijs, Jacques R. D. Lépine, editors, Star Clusters (IAU S266): Basic Galactic Building Blocks, page 75:

     For many of the young (~10Myr) star clusters M_dyn >> M_phot Goodwin & Bastian (2006) suggest that this is a signature of gas expulsion and the 'infant mortality' scenario discussed in Section 2.1, i.e., they conclude that these clusters are supervirial.

   • 2016, Richard J. Parker, Nicholas J. Wright, “Dynamical evolution of star forming regions - II. Basic kinematics”, in arXiv‎:

     If measured early enough (${\displaystyle <}$2 Myr in our simulations, or ${\displaystyle \sim }$20 crossing times), the velocity dispersion can be used to determine whether a region was highly supervirial at birth without the risk of degeneracy.

   • 2019, Roberto A. Capuzzo Dolcetta, Classical Newtonian Gravity:, page 57:

     It is subvirial when Q < 1, which corresponds to a negative acceleration of the polar inertia moment, Ï < 0 (initial contraction) and supervirial when Q >1, which corresponds to a positive acceleration of the polar inertia moment, Ï > 0 (initial expansion).