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We introduce a dark energy-modified minimum length uncertainty relation(DE-MLUR) or dark energy uncertainty principle (DE-UP) for short. The newrelation is structurally similar to the MLUR introduced by K{\' a}rolyh{\' a}zy(1968), and reproduced by Ng and van Dam (1994) using alternative arguments,but with a number of important differences. These include a dependence on thede Sitter horizon, which may be expressed in terms of the cosmological constantas $l_{\rm dS} \sim 1/\sqrt{\Lambda}$. Applying the DE-UP to both charged andneutral particles, we obtain estimates of two limiting mass scales, expressedin terms of the fundamental constants $\left\{G,c,\hbar,\Lambda, e\right\}$.Evaluated numerically, the charged particle limit corresponds to the order ofmagnitude value of the electron mass ($m_e$), while the neutral particle limitis consistent with current experimental bounds on the mass of the electronneutrino ($m_{\nu_e}$). Possible cosmological consequences of the DE-UP areconsidered and we note that these lead naturally to a holographic relationbetween the bulk and the boundary of the Universe. Low and high energy regimesin which dark energy effects may dominate canonical quantum behaviour areidentified and the possibility of testing the model using near-futureexperiments is briefly discussed.

Minimum length uncertainty relations in the presence of dark energy