The cosmological constant vs adiabatic invariance Sh. Khlghatyan, A. A. Kocharyan, A. Stepanian and V. G. Gurzadyan Eur. Phys. J. Plus, 137 4 (2022) 458 Published online: 12 April 2022 DOI: 10.1140/epjp/s13360-022-02683-x