2020/01/31 by Davood Momeni
Physics and Astronomy · #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #De Sitter universe #False vacuum #Inflation (cosmology) #Inflationary epoch #Metric expansion of space #Noncommutative and Quantum Gravity Theories #Quantization (signal processing) #Quantum cosmology #Scalar field #Universe #Vacuum energy #gr-qc
paper · pdf · doi:10.1142/s0217751x21500020
published in International Journal of Modern Physics A 36(01), 2150002 (World Scientific) · version accepted in "Int. J. Mod. Phys. A (IJMPA)", major revision, references added+discussions
openalex created_date 2020/01/30 · arxiv created 2020/11/08 · openalex publication_date 2021/01/10 · arxiv updated 2021/01/11 · openalex updated_date 2026/08/05
In a primordial universe pre- (post-)inflationary era, there could be phases of early universe made of cold gas baryons, radiation and early post-inflationary cosmological constant. I showed that in the baryonic epoch, the quantum vacuum is unique. By using the standard quantization scheme for a massive minimally coupled scalar field with maximal conformal symmetry in the classical space–time, I demonstrated that the scalar modes had an effective mass [Formula: see text] (or [Formula: see text]). This argument was validated when the conformal time [Formula: see text] kept so close to the inflation ending time [Formula: see text]. The energy density of the baryonic matter diverged at the inflation border and vanishes at the late time future. Furthermore, I argued that at very early accelerating epoch when the radiation was the dominant part in the close competition with the early time cosmological constant, fine-tuned mass of the scalar field [Formula: see text] also provided a unique quantum vacuum. The reason is that the effective mass eventually is vanished. A remarkable observation was that all the other possible vacuum states “squeezed” eternally.