Efficiency of magnetic Penrose process in higher dimensional Myers-Perry black hole spacetimes

In this paper, we consider a well-established magnetic Penrose process (MPP) and bring out its impact on the efficiency of energy extraction from higher D>4 dimensional black holes. We further consider the efficiency of energy extraction from black holes with (n-1) and n rotations. We show that when black hole has (n-1) rotations it has only one horizon and hence the energy efficiency is infinitely large even without MPP. If black hole has n rotations in D>4, the energy efficiency becomes not infinitely large in contrast to the one with (n-1) rotations. However, it turns out that the efficiency of energy extraction from black holes with n rotations is enormously enhanced by MPP. Hence, the arbitrarily large energy efficiency can be compensated by MPP. We further show that the efficiency of energy extraction can exceed over 150% and 200% for D=5, 6 and >200% for D=7, 8 dimensions, respectively. It is also interestingly found that for about the extremal value of rotation parameters the energy efficiency remains above 100 % in D=7, 8 as compared with that in D=5,6 dimensions. MPP can eventually make higher D>4 dimensional black holes more efficient even with n rotations.