scholarly journals Computing Dark Energy and Ordinary Energy of the Cosmos as a Double Eigenvalue Problem

2015 ◽  
Vol 06 (04) ◽  
pp. 384-395 ◽  
Author(s):  
Mohamed S. El Naschie
Keyword(s):  
Dark Energy ◽  
Eigenvalue Problem ◽  
Double Eigenvalue

scholarly journals New Cosmological Solutions of a Nonlocal Gravity Model

Symmetry ◽  
2021 ◽  
Vol 14 (1) ◽  
pp. 3
Author(s):  
Ivan Dimitrijevic ◽  
Branko Dragovich ◽  
Zoran Rakic ◽  
Jelena Stankovic
Keyword(s):  
Dark Energy ◽  
Eigenvalue Problem ◽  
Gravity Model ◽  
Radiation Effects ◽  
Equations Of Motion ◽  
Flat Space ◽  
Nonlocal Operator ◽  
Cosmological Solutions

A nonlocal gravity model (2) was introduced and considered recently, and two exact cosmological solutions in flat space were presented. The first solution is related to some radiation effects generated by nonlocal dynamics on dark energy background, while the second one is a nonsingular time symmetric bounce. In the present paper, we investigate other possible exact cosmological solutions and find some the new ones in nonflat space. Used nonlocal gravity dynamics can change the background topology. To solve the corresponding equations of motion, we first look for a solution of the eigenvalue problem □(R−4Λ)=q(R−4Λ). We also discuss possible extension of this model with a nonlocal operator, symmetric under □⟷□−1, and its connection with another interesting nonlocal gravity model.

Dark energy on firmer footing

Nature ◽  
2010 ◽  
Author(s):  
Eugenie Samuel Reich
Keyword(s):  
Dark Energy
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