On a Generalization of the Modified Gravity Model

2014 ◽  
pp. 439-446
Author(s):  
Diana Santalova
Keyword(s):  
Gravity Model ◽  
Modified Gravity

Multi Depot Vehicle Routing Using Ant Colony Optimization - Trip Assignment of Freight Flow Using Modified Gravity Model

2021 ◽  
Author(s):  
Husnain Saeed ◽  
Shahid Ikramullah ◽  
Mushtaq Khan ◽  
Fahd Amjad ◽  
Liaqat Ali ◽  
...  
Keyword(s):  
Ant Colony Optimization ◽  
Vehicle Routing ◽  
Gravity Model ◽  
Modified Gravity ◽  
Ant Colony ◽  
Freight Flow

scholarly journals Cosmological scaling solutions with tachyon: Modified gravity model

2008 ◽  
Vol 668 (3) ◽  
pp. 182-186 ◽  
Author(s):  
A.A. Sen ◽  
N. Chandrachani Devi
Keyword(s):  
Gravity Model ◽  
Modified Gravity

scholarly journals A new source for a brane cosmological constant from a modified gravity model in the bulk

2009 ◽  
Vol 807 (1-2) ◽  
pp. 56-72 ◽  
Author(s):  
Orfeu Bertolami ◽  
Carla Carvalho ◽  
João N. Laia
Keyword(s):  
Cosmological Constant ◽  
Gravity Model ◽  
Modified Gravity

scholarly journals Gravitational collapse of compact stars in f(R) = ξR4 gravity

2021 ◽  
Author(s):  
Jay Solanki
Keyword(s):  
Gravity Model ◽  
Gravitational Collapse ◽  
Analytical Solutions ◽  
Modified Gravity ◽  
Compact Stars ◽  
Physical Parameters ◽  
Field Equations ◽  
Paper Model ◽  
Acceptable Model ◽  
Physical Quantities

In this paper, model of gravitational collapse of anisotropic compact stars in a new theory of [Formula: see text] gravity has been developed. The author considers the modified gravity model of [Formula: see text] to investigate a physically acceptable model of gravitational collapse of anisotropic compact stars. First, the author presents a brief review of the development of field equations of gravitational collapse in [Formula: see text] gravity for a particular interior metric for compact stars. Then analytical solutions for various physical quantities of collapsing anisotropic compact stars in [Formula: see text] gravity have been developed. By analyzing plots of various physical parameters and conditions, it is shown that the model is physically acceptable for describing the gravitational collapse of anisotropic compact stars in [Formula: see text] gravity.

scholarly journals Baryonic Tully–Fisher Test of Grumiller’s Modified Gravity Model

2021 ◽  
Vol 27 (2) ◽  
pp. 157-162
Author(s):  
Samrat Ghosh ◽  
Arunava Bhadra ◽  
Amitabha Mukhopadhyay ◽  
Kabita Sarkar
Keyword(s):  
Gravity Model ◽  
Modified Gravity ◽  
Fisher Test

scholarly journals HALO MODELS IN MODIFIED GRAVITY THEORIES WITH SELF-ACCELERATED EXPANSION

2011 ◽  
Vol 20 (12) ◽  
pp. 2383-2397 ◽  
Author(s):  
TATSUYA NARIKAWA ◽  
RAMPEI KIMURA ◽  
TATSUNOSUKE YANO ◽  
KAZUHIRO YAMAMOTO
Keyword(s):  
Gravity Model ◽  
Modified Gravity ◽  
Outer Region ◽  
Gravity Models ◽  
Accelerated Expansion ◽  
Newtonian Gravity ◽  
Sphere Model ◽  
Modified Gravity Theories ◽  
The Common ◽  
The Difference

We investigate the structure of halos in the sDGP (self-accelerating branch of the Dvali–Gavadadze–Porrati braneworld gravity) model and the Galileon modified gravity model on the basis of the static and spherically symmetric solutions of the collisionless Boltzmann equation, which reduce to the singular isothermal sphere model and the King model in the limit of Newtonian gravity. The common feature of these halos is that the density of a halo in the outer region is larger (smaller) in the sDGP (Galileon) model, respectively, in comparison with Newtonian gravity. This comes from the suppression (enhancement) of the effective gravity at large distance in the sDGP (Galileon) model, respectively. However, the difference between these modified gravity models and Newtonian gravity only appears outside the halo due to the Vainshtein mechanism, which makes it difficult to distinguish between them. We also discuss the case in which the halo density profile is fixed independently of the gravity model for comparison between our results and previous work.

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