This article serves as an introduction to the linear aspects of recent submission by Krieger, Miao, and author, see arXiv:2009.08843. It also surveys some results obtained on decay waves various backgrounds or in presence a potential over past 15 years. Particular emphasis is placed role 0 energy. The techniques are based spectral scattering theory. Note that this not systematic review, would r...

The objective of this paper is to introduce a new class submanifolds which are called pointwise quasi hemi-slant in almost Hermitian manifolds extends hemi-slant, semi-slant and slant very natural way. Several basic results respect proved paper. Moreover, we obtain some conditions the distributions involved definition submanifolds. We also get for totally geodesic mixed Finally, illustrate exam...