Entanglement and correlations between local observables in de Sitter spacetime

• URL: http://arxiv.org/abs/2511.17382v1
• Date: Fri, 21 Nov 2025 16:45:47 GMT
• Title: Entanglement and correlations between local observables in de Sitter spacetime
• Authors: Patricia Ribes-Metidieri, Ivan Agullo, Béatrice Bonga,
• Abstract summary: We study entanglement between pairs of field modes compactly supported within de Sitter's cosmological patch.<n>We find that increasing curvature increases correlations between local modes but, somewhat counterintuitively, decreases their entanglement.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Studies of quantum field entanglement in de Sitter space based on the von Neumann entropy of local patches have concluded that curvature enhances entanglement between regions and their complements. Similar conclusions about entanglement enhancement have been reached in analyses of Fourier modes in the cosmological patch of de Sitter space. We challenge this interpretation by adopting a fully local approach: examining entanglement between pairs of field modes compactly supported within de Sitter's cosmological patch. Our approach is formulated in terms of the properties of a metric tensor and an associated complex structure induced by the Bunch-Davies vacuum on the classical phase space. We find that increasing curvature increases correlations between local modes but, somewhat counterintuitively, decreases their entanglement. Our methods allow us to characterize how entanglement is spatially distributed, revealing that a cosmological constant, even if tiny, qualitatively alters the vacuum's entanglement structure. We show that our results are compatible with previous entropy-based studies when properly interpreted. Our findings have implications for entanglement between observables generated during cosmic inflation.

Related papers

• Entanglement Structure of Nonlocal Field Theories [0.0]
  We show that nonlocality gives rise to quantum states of such complexity that conventional geometric models of spacetime fall short.<n>Our results demonstrate that nonlocality gives rise to quantum states of such complexity that conventional geometric models of spacetime fall short.
  arXiv  Detail & Related papers  (2025-11-13T17:12:15Z)
• Hidden quantum-classical correspondence in chaotic billiards revealed by mutual information [0.8192907805418583]
  Increasing chaos in quantum billiards enhances mutual information between conjugate phase space variables.<n> spatial delocalization may coincide with increased mutual information between position and momentum.<n>These correlations track classical invariant structures in phase space and persist beyond the semiclassical regime.
  arXiv  Detail & Related papers  (2025-05-13T03:37:29Z)
• Evolution of Gaussians in the Hellinger-Kantorovich-Boltzmann gradient flow [44.500314182711236]
  We derive explicit ordinary equations govern the evolution of mean, covariance, and mass under HK-Boltzmann flow.<n>We demonstrate exponential convergence to equilibrium through constructing a gradient structure associated with a Polyak-Lojasiewicz-type inequalities.<n>We extend our analysis to non-Gaussian targets exhibiting strong log-lambda-concavity.
  arXiv  Detail & Related papers  (2025-04-29T03:54:56Z)
• A quasi-particle picture for entanglement cones and horizons in analogue cosmology [45.88028371034407]
  We study the appearance of scalar and pseudo-scalar condensates for self-interacting Dirac fermions.<n>We show that the combined breakdown of time-reversal symmetry due to the expanding spacetime, and parity due to a pseudo-scalar condensate, manifests through the structure of the light-cone-like propagation of entanglement.
  arXiv  Detail & Related papers  (2025-03-24T22:20:16Z)
• The effect of curvature on local observables in quantum field theory [0.0]
  We compute the leading order corrections to the expected value of the squared field amplitude of a real quantum field due to curvature in a localized region of spacetime.<n>We then apply our results to particle detector models, quantifying the effect of spacetime curvature in localized field probes.
  arXiv  Detail & Related papers  (2024-12-16T19:07:32Z)
• Interacting Dirac fields in an expanding universe: dynamical condensates and particle production [41.94295877935867]
  This work focuses on a self-interacting field theory of Dirac fermions in an expanding Friedmann-Robertson-Walker universe.<n>We study how the non-trivialative condensates arise and, more importantly, how their real-time evolution has an impact on particle production.
  arXiv  Detail & Related papers  (2024-08-12T14:21:25Z)
• Entanglement Structures in Quantum Field Theories II: Distortions of Vacuum Correlations Through the Lens of Local Observers [0.0]
  Local regions of a quantum field can be limited by classical correlations. This protocol offers insight and practical guidance for clarifying the unavoidable distortion of quantum field correlations when viewed from the vantage of a pair of local observers.
  arXiv  Detail & Related papers  (2023-04-09T02:53:01Z)
• Fermion production at the boundary of an expanding universe: a cold-atom gravitational analogue [68.8204255655161]
  We study the phenomenon of cosmological particle production of Dirac fermions in a Friedman-Robertson-Walker spacetime. We present a scheme for the quantum simulation of this gravitational analogue by means of ultra-cold atoms in Raman optical lattices.
  arXiv  Detail & Related papers  (2022-12-02T18:28:23Z)
• Nonperturbative Casimir effects: Vacuum structure, Confinement, and Chiral Symmetry Breaking [91.3755431537592]
  We consider phase properties of confining gauge theories and strongly interacting fermion systems. In particular, the chiral and deconfinement phase transitions properties in the presence of Casimir plates.
  arXiv  Detail & Related papers  (2022-08-06T07:39:36Z)
• From locality to irregularity: Introducing local quenches in massive scalar field theory [68.8204255655161]
  We consider the dynamics of excited local states in massive scalar field theory in an arbitrary spacetime dimension. We identify different regimes of their evolution depending on the values of the field mass and the quench regularization parameter. We also investigate the local quenches in massive scalar field theory on a cylinder and show that they cause an erratic and chaotic-like evolution of observables.
  arXiv  Detail & Related papers  (2022-05-24T18:00:07Z)
• A Flat Space Analogue for the Quantum Origin of Structure [0.0]
  We show that the quantum vacuum is uniquely identified by in-in correlators with a total energy pole and no additional poles at physical momenta. We relate these flat-space in-in correlators to the probability amplitude for exciting multiple Unruh-de Witt detectors.
  arXiv  Detail & Related papers  (2022-03-18T16:36:39Z)

This list is automatically generated from the titles and abstracts of the papers in this site.

This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.