2018/12/06 by Roberto Pierini, Shahpoor Moradi, Stefano Mancini · 1 citation
Physics and Astronomy · #Anisotropy #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #Entanglement witness #Entropy (arrow of time) #Massless particle #Quantum entanglement #Quantum many-body systems #Scalar field #Spacetime #Squashed entanglement #gr-qc #quant-ph
paper · pdf · doi:10.1140/epjd/e2019-90463-y
published as Eur. Phys. J. D (2019) 73: 33
arxiv created 2018/12/06 · openalex created_date 2018/12/22 · openalex publication_date 2019/02/01 · arxiv updated 2019/03/13 · openalex updated_date 2026/08/05
We study the effect of space anisotropy in the entanglement generated by expanding universe on spin 0 and 1/2 fields. For massive scalar field we find revivals of entanglement entropy vs momentum after decreasing from the maximum at k = 0. In massive Dirac field the effect is a slight distortion of the non-monotonic profile giving rise to the maximum of entanglement entropy at k > 0. More interestingly, massless field of both type can only get entangled through anisotropy, with a maximum of entanglement entropy occurring at k > 0.