The hypoelliptic Laplacian, introduced by Bismut, is a family of second order differential hypoelliptic operators, which interpolates in a proper sense between the classical elliptic Laplacian and the derivation along the generator of the geodesic flow. In this talk, we will give a short introduction to the hypoelliptic Laplacian. We will describe its
relation with the Fried conjecture which claims that the analytic torsion,which is an alternating product of regularized determinants of the Hodge Laplacians, equals the zero value of the dynamical zeta function.

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