Extremal black holes in the Horava-Lifshitz gravity

We study the near-horizon geometry of extremal black holes in the z=3 HoA (TM) ava-Lifshitz gravity with a flow parameter lambda. For lambda > 1/2, near-horizon geometry of extremal black holes are AdS (2)xS (2) with different radii, depending on the (modified) HoA (TM) ava-Lifshitz gravity. For 1/3a parts per thousand currency sign lambda a parts per thousand currency sign1/2, the radius v (2) of S (2) is negative, which means that the near-horizon geometry is ill-defined and the corresponding Bekenstein-Hawking entropy is zero. We show explicitly that the entropy function approach does not work for obtaining the Bekenstein-Hawking entropy of extremal black holes.