scholarly journals Aspects of Ultraviolet Non-local Gravity

2021 ◽  
Author(s):  
◽  
Shubham Maheshwari
Keyword(s):  
Local Gravity ◽  
Non Local

scholarly journals Ghosts in classes of non-local gravity

2015 ◽  
Vol 743 ◽  
pp. 189-197 ◽  
Author(s):  
Antonio De Felice ◽  
Misao Sasaki
Keyword(s):  
Local Gravity ◽  
Non Local

scholarly journals Black supernovae and black holes in non-local gravity

2016 ◽  
Vol 2016 (4) ◽  
pp. 1-21 ◽  
Author(s):  
Cosimo Bambi ◽  
Daniele Malafarina ◽  
Leonardo Modesto
Keyword(s):  
Black Holes ◽  
Local Gravity ◽  
Non Local

Non-local Gravity

2021 ◽  
pp. 109-127
Author(s):  
Gianluca Calcagni
Keyword(s):  
Local Gravity ◽  
Non Local

scholarly journals Energy conditions in non-local gravity

2019 ◽  
Vol 16 (10) ◽  
pp. 1950149 ◽  
Author(s):  
M. Ilyas
Keyword(s):  
Power Law ◽  
Arbitrary Function ◽  
Energy Conditions ◽  
De Sitter ◽  
Sitter Solution ◽  
Local Gravity ◽  
Non Local

We investigate the different energy conditions in non-local gravity, which is obtained by adding an arbitrary function of d’Alembertian operator, [Formula: see text], to the Hilbert–Einstein action. We analyze the validity of four different energy conditions and illustrate the different constraints over parameters of the power-law solution as well as de Sitter solution.

scholarly journals Non-local curvature and Gauss–Bonnet cosmologies by Noether symmetries

2020 ◽  
Vol 135 (12) ◽  
Author(s):  
Francesco Bajardi ◽  
Salvatore Capozziello ◽  
Daniele Vernieri
Keyword(s):  
Noether Symmetries ◽  
Field Equations ◽  
Local Curvature ◽  
Symmetry Approach ◽  
Local Gravity ◽  
Cosmological Solutions ◽  
Related Point ◽  
Functional Forms ◽  
Non Local ◽  
Scalar Invariants

AbstractNon-local gravity cosmologies are considered under the standard of Noether symmetry approach. In particular, we focus on non-local theories whose gravitational actions depend on curvature and Gauss–Bonnet scalar invariants. Specific functional forms of the related point-like Lagrangians are selected by Noether symmetries, and we solve the corresponding field equations finding out exact cosmological solutions.

scholarly journals Considerations on gravitational waves in higher-order local and non-local gravity

2020 ◽  
Vol 810 ◽  
pp. 135821 ◽  
Author(s):  
S. Capozziello ◽  
M. Capriolo ◽  
S. Nojiri
Keyword(s):  
Gravitational Waves ◽  
Higher Order ◽  
Local Gravity ◽  
Non Local

scholarly journals SCREENING OF COSMOLOGICAL CONSTANT IN NON-LOCAL COSMOLOGY

2012 ◽  
Vol 21 (01) ◽  
pp. 1250006 ◽  
Author(s):  
YING-LI ZHANG ◽  
MISAO SASAKI
Keyword(s):  
Cosmological Constant ◽  
Dimensionless Parameter ◽  
Weak Condition ◽  
Fine Tuning ◽  
Expanding Universe ◽  
Cosmological Constant Problem ◽  
Local Gravity ◽  
Cosmological Solutions ◽  
Non Local ◽  
Matter Fields

We consider a model of non-local gravity with a large bare cosmological constant, Λ, and study its cosmological solutions. The model is characterized by a function f(ψ) = f0eαψ, where ψ = □-1R and α is a real dimensionless parameter. In the absence of matter, we find an expanding universe solution a ∝ tn with n < 1, that is, a universe with decelerated expansion without any fine-tuning of the parameter. Thus the effect of the cosmological constant is effectively shielded in this solution. It has been known that solutions in non-local gravity often suffer from the existence of ghost modes. In the present case, we find the solution is ghost-free if α > αcr ≈ 0.17. This is quite a weak condition. We argue that the solution is stable against the inclusion of matter fields. Thus our solution opens up new possibilities for solution to the cosmological constant problem.

scholarly journals Non-perturbative spectrum of non-local gravity

2019 ◽  
Vol 795 ◽  
pp. 391-397 ◽  
Author(s):  
Gianluca Calcagni ◽  
Leonardo Modesto ◽  
Giuseppe Nardelli
Keyword(s):  
Local Gravity ◽  
Non Local
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