Abstract
We uncover an infinite number of vacua in two-dimensional quantum field theory, the Klein-Gordon field for simplicity, by conceiving a new mode that is classified by a real positive parameter κ. We show each mode has a distinct vacuum, say κ-vacuum. This new mode is a generalization of the Unruh-Minkowski mode. Moreover, the Minkowski and Rindler vacua are special cases of the κ-vacuum for κ = 1 and κ → ∞, respectively.