scholarly journals Large scale quantum entanglement in de Sitter spacetime

2018 ◽  
Vol 98 (2) ◽  
Author(s):  
Akira Matsumura ◽  
Yasusada Nambu
Keyword(s):  
Quantum Entanglement ◽  
Large Scale ◽  
De Sitter Spacetime ◽  
De Sitter ◽  
Sitter Spacetime

scholarly journals ON BELTRAMI MODEL OF de SITTER SPACETIME

2004 ◽  
Vol 19 (22) ◽  
pp. 1701-1709 ◽  
Author(s):  
HAN-YING GUO ◽  
CHAO-GUANG HUANG ◽  
ZHAN XU ◽  
BIN ZHOU
Keyword(s):  
Large Scale ◽  
De Sitter Spacetime ◽  
De Sitter ◽  
Spatial Curvature ◽  
Relativity Principle ◽  
Sitter Spacetime ◽  
Test Particles ◽  
Light Signals ◽  
Definition Of ◽  
Shed Light

Based on some important properties of dS space, we present a Beltrami model ℬΛ that may shed light on the observable puzzle of dS space and the paradox between the special relativity principle and cosmological principle. In ℬΛ, there are inertial-type coordinates and inertial-type observers. Thus, the classical observables can be defined for test particles and light signals. In addition, by choosing the definition of simultaneity the Beltrami metric is transformed to the Robertson–Walker-like metric. It is of positive spatial curvature of order Λ. This has already been shown by the CMB power spectrum from WMAP and should be further confirmed by its data in large scale.

scholarly journals Inflation in de Sitter spacetime and CMB large scale anomaly

2015 ◽  
Vol 39 (9) ◽  
pp. 095101 ◽  
Author(s):  
Dong Zhao ◽  
Ming-Hua Li ◽  
Ping Wang ◽  
Zhe Chang
Keyword(s):  
Large Scale ◽  
De Sitter Spacetime ◽  
De Sitter ◽  
Sitter Spacetime

scholarly journals Unimodular vs nilpotent superfield approach to pure dS supergravity

2021 ◽  
Vol 2021 (1) ◽  
Author(s):  
Sukruti Bansal ◽  
Silvia Nagy ◽  
Antonio Padilla ◽  
Ivonne Zavala
Keyword(s):  
String Theory ◽  
General Framework ◽  
Recent Progress ◽  
High Energy ◽  
De Sitter Spacetime ◽  
De Sitter ◽  
New Approach ◽  
Sitter Spacetime ◽  
Novel Approach ◽  
De Sitter Vacua

Abstract Recent progress in understanding de Sitter spacetime in supergravity and string theory has led to the development of a four dimensional supergravity with spontaneously broken supersymmetry allowing for de Sitter vacua, also called de Sitter supergravity. One approach makes use of constrained (nilpotent) superfields, while an alternative one couples supergravity to a locally supersymmetric generalization of the Volkov-Akulov goldstino action. These two approaches have been shown to give rise to the same 4D action. A novel approach to de Sitter vacua in supergravity involves the generalisation of unimodular gravity to supergravity using a super-Stückelberg mechanism. In this paper, we make a connection between this new approach and the previous two which are in the context of nilpotent superfields and the goldstino brane. We show that upon appropriate field redefinitions, the 4D actions match up to the cubic order in the fields. This points at the possible existence of a more general framework to obtain de Sitter spacetimes from high-energy theories.

scholarly journals Wavefunctions in dS/CFT revisited: principal series and double-trace deformations

2021 ◽  
Vol 2021 (4) ◽  
Author(s):  
Hiroshi Isono ◽  
Hoiki Madison Liu ◽  
Toshifumi Noumi
Keyword(s):  
Principal Series ◽  
Light Fields ◽  
Quadratic Term ◽  
De Sitter Spacetime ◽  
Cosmological Horizon ◽  
De Sitter ◽  
Complementary Series ◽  
Point Function ◽  
Sitter Spacetime ◽  
Simple Scaling

Abstract We study wavefunctions of heavy scalars on de Sitter spacetime and their implications to dS/CFT correspondence. In contrast to light fields in the complementary series, heavy fields in the principal series oscillate outside the cosmological horizon. As a consequence, the quadratic term in the wavefunction does not follow a simple scaling and so it is hard to identify it with a conformal two-point function. In this paper, we demonstrate that it should be interpreted as a two-point function on a cyclic RG flow which is obtained by double-trace deformations of the dual CFT. This is analogous to the situation in nonrelativistic AdS/CFT with a bulk scalar whose mass squared is below the Breitenlohner-Freedman (BF) bound. We also provide a new dS/CFT dictionary relating de Sitter two-point functions and conformal two-point functions in the would-be dual CFT.

scholarly journals Interacting quantum fields in various charts of anti–de Sitter spacetime

2021 ◽  
Vol 103 (4) ◽  
Author(s):  
E. T. Akhmedov ◽  
A. A. Artemev ◽  
I. V. Kochergin
Keyword(s):  
De Sitter Spacetime ◽  
Quantum Fields ◽  
De Sitter ◽  
Sitter Spacetime
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