Abstract In this paper, we give new characterizations for warped-twisted
product manifolds. We study gradient Riemann, gradient Ricci, gradient Yamabe solitons and quasi-Einstein case on warped-twisted product manifolds and
we investigate the effect of a gradient soliton and quasi-Einstein case on such manifolds to their factor manifolds. We also get some results when the factor
manifolds of the warped-twisted product manifolds are compact, the twisting and the warping functions are harmonic.
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