ﻻ يوجد ملخص باللغة العربية
In this work, we study the phenomena of quantum entanglement by computing de Sitter entanglement entropy from von Neumann measure. For this purpose we consider a bipartite quantum field theoretic setup in presence of axion originating from ${bf Type~ II~B}$ string theory. We consider the initial vacuum to be CPT invariant non-adiabatic $alpha$ vacua state under ${bf SO(1,4)}$ ismometry, which is characterized by a real one-parameter family. To implement this technique we use a ${bf S^2}$ which divide the de Sitter into two exterior and interior sub-regions. First, we derive the wave function of axion in an open chart for $alpha$ vacua by applying Bogoliubov transformation on the solution for Bunch-Davies vacuum state. Further, we quantify the density matrix by tracing over the contribution from the exterior region. Using this result we derive entanglement entropy, R$acute{e}$nyi entropy and explain the long-range quantum effects in primordial cosmological correlations. We also provide a comparison between the results obtained from Bunch-Davies vacuum and the generalized $alpha$ vacua, which implies that the amount of quantum entanglement and the long-range effects are larger for non zero value of the parameter $alpha$. Most significantly, our derived results for $alpha$ vacua provides the necessary condition for generating non zero entanglement entropy in primordial cosmology.
In this work, we study the quantum entanglement and compute entanglement entropy in de Sitter space for a bipartite quantum field theory driven by axion originating from ${bf Type~ IIB}$ string compactification on a Calabi Yau three fold (${bf CY^3}$
In this work, we study the impact of quantum entanglement on the two-point correlation function and the associated primordial power spectrum of mean square vacuum fluctuation in a bipartite quantum field theoretic system. The field theory that we con
We consider the entanglement entropy of a free massive scalar field in the one parameter family of $alpha$-vacua in de Sitter space by using a method developed by Maldacena and Pimentel. An $alpha$-vacuum can be thought of as a state filled with part
We study the instability of de Sitter space-time (dS) under thermal radiation in different vacua. For this purpose we model the interaction between thermal radiation and unknown ultraviolet physics as a scattering process inside the horizon. Then we
We study the arguments given in [1] which suggest that the uplifting procedure in the KKLT construction is not valid. First we show that the modification of the SUSY breaking sector of the nilpotent superfield, as proposed in [1], is not consistent w