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The nanofabrication technology has taught us that an $m$-dimensionalconfining potential imposed upon an $n$-dimensional electron gas paves the wayto a quasi-($n-m$)-dimensional electron gas, with $m \le n$ and $1\le n, m \le3$. This is the road to the (semiconducting) quasi-$n$ dimensional electron gassystems we have been happily traversing on now for almost three decades.Achieving quasi-one dimensional electron gas (Q-1DEG) [or quantum wire(s) formore practical purposes] led us to some mixed moments in this journey: whilethe reduced phase space for the scattering led us believe in the route to thefaster electron devices, the proximity to the 1D systems left us in the dilemmaof describing it as a Fermi liquid or as a Luttinger liquid. No one had eversuspected the potential of the former, but it took quite a while for some toconvince the others on the latter. A realistic Q-1DEG system at the lowtemperatures is best describable as a Fermi liquid rather than as a Luttingerliquid. In the language of condensed matter physics, a critical scrutiny ofQ-1DEG systems has provided us with a host of exotic (electronic, optical, andtransport) phenomena revealing their unparallel behavior characteristics unseenin their higher or lower dimensional counterparts. Here, we embark on thesystematic investigation of the inelastic electron scattering (IES) and ofinelastic light scattering (ILS) from the elementary electronic excitations inquantum wires in the absence of an applied magnetic field. To that end, webegin with the Kubo's correlation functions to derive the generalized nonlocal,dynamic dielectric function, the inverse dielectric function, and the Dysonequation for the dynamic screened potential in the framework of Bohm-Pines'full and famous random-phase approximation...

Inelastic electron and Raman scattering from the collective excitations in quantum wires: Zero magnetic field