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Based on the entropy$-$area relation from Nouicer's generalised uncertaintyprinciple (GUP), we derive the GUP modified Friedmann equations from the firstlaw of thermodynamics at apparent horizon. We find a minimum apparent horizondue to the minimal length notion of GUP. We show that the energy density ofuniverse has a maximum and finite value at the minimum apparent horizon. Bothminimum apparent horizon and maximum energy density imply the absence of theBig Bang singularity. Moreover, we investigate the GUP effects on thedeceleration parameter for flat case. Finally, we examine the validity ofgeneralised second law (GSL) of thermodynamics. We show that GSL always holdsin a region enclosed by apparent horizon for the GUP effects. We alsoinvestigate the GSL in $\Lambda CDM$ cosmology and find that the total entropychange of universe has a maximum value in the presence of GUP effects.

Investigation of generalised uncertainty principle effects on FRW cosmology