Քոթանջյան, Վարդազար Խորենի

Biology

This work examines quantum vacuum phenomena in non-inertial reference frames and curved spacetime, focusing on how acceleration and gravity modify the notion of vacuum in quantum field theory. In flat spacetime, the vacuum is defined relative to inertial observers as a state with no particle excitations; however, in non-inertial frames this definition becomes observer-dependent. The study analyzes effects such as particle creation perceived by uniformly accelerated observers (Unruh effect), where the vacuum appears as a thermal bath with a temperature proportional to acceleration, and extends the discussion to quantum fields in gravitational backgrounds, where spacetime curvature leads to analogous particle production mechanisms. Special attention is given to the role of event horizons, both kinematic (Rindler horizons in accelerated frames) and gravitational (black hole horizons), which fundamentally alter the structure of quantum modes and lead to observable effects such as Hawking radiation. The work also explores the mathematical formalism of Bogoliubov transformations, which relate field quantizations in different coordinate systems and provide a rigorous framework for describing vacuum ambiguity. In addition, backreaction issues, energy-momentum tensor renormalization, and the limitations of semiclassical approximations are discussed in relation to strong gravitational fields.