Rodrigo Investigation of generalised uncertainty principle effects on FRW cosmology Özgür Ökcü Hide abstract | Show figures | Show BibTeX | Show discussion | View PDF | 2401.09477v1 Based on the entropy− area relation from Nouicer's generalised uncertainty principle (GUP), we derive the GUP modified Friedmann equations from the first law of thermodynamics at apparent horizon. We find a minimum apparent horizon due to the minimal length notion of GUP. We show that the energy density of universe has a maximum and finite value at the minimum apparent horizon. Both minimum apparent horizon and maximum energy density imply the absence of the Big Bang singularity. Moreover, we investigate the GUP effects on the deceleration parameter for flat case. Finally, we examine the validity of generalised second law (GSL) of thermodynamics. We show that GSL always holds in a region enclosed by apparent horizon for the GUP effects. We also investigate the GSL in ΛCDM cosmology and find that the total entropy change of universe has a maximum value in the presence of GUP effects. Authors' comments: 17 pages, 2 figures