The effects of a background potential in star cluster evolution - A delay in the relaxation time-scale and runaway collision processesB. Reinoso, D. R. G. Schleicher, M. Fellhauer, N. W. C. Leigh and R. S. KlessenA&A, 639 (2020) A92DOI: https://doi.org/10.1051/0004-6361/202037843