[HTML][HTML] Anisotropic compact stars in f (R) gravity

GGL Nashed, S Capozziello - The European Physical Journal C, 2021 - Springer
We derive a new interior solution for stellar compact objects in\(f\mathcal {(R)}\) gravity
assuming a differential relation to constrain the Ricci curvature scalar. To this aim, we …

Validation of energy conditions in wormhole geometry within viable f(R) gravity

GC Samanta, N Godani - The European Physical Journal C, 2019 - Springer
In this work, wormholes, tunnel like structures introduced by Morris and Thorne (Am J Phys
56: 395, 1988), are explored within the framework of f (R) gravity. Using the shape function b …

Nontrivial black hole solutions in gravitational theory

GGL Nashed, S Nojiri - Physical Review D, 2020 - APS
Recent observation shows that general relativity (GR) is not valid in the strong regime. f (R)
gravity, where R is the Ricci scalar, is regarded to be a good candidate able to cure the …

Static traversable wormholes in f (R, T)= R+ 2αlnT gravity

N Godani, GC Samanta - Chinese Journal of Physics, 2019 - Elsevier
Traversable wormholes, studied by Morris and Thorne [3] in general relativity, are
investigated in this research paper in f (R, T) gravity by introducing a new form of non-linear f …

Normalized additional velocity distribution: Testing the radial profile of dark matter halos and MOND

DC Rodrigues, A Hernandez-Arboleda… - Physics of the Dark …, 2023 - Elsevier
We propose a complementary and fast approach to study galaxy rotation curves directly from
the sample data, instead of individual fits. With this approach, some relevant tests can be …

Characterization of the K2-38 planetary system-unraveling one of the densest planets known to date

B Toledo-Padrón, C Lovis, AS Mascareño… - Astronomy & …, 2020 - aanda.org
Context. An accurate characterization of the known exoplanet population is key to
understanding the origin and evolution of planetary systems. Determining true planetary …

Evidence against cuspy dark matter haloes in large galaxies

DC Rodrigues, A del Popolo, V Marra… - Monthly Notices of …, 2017 - academic.oup.com
We develop and apply new techniques to uncover systematic effects in galaxy rotation
curves (RCs). Considering that an ideal dark matter (DM) profile should yield RCs that have …

Cosmological dynamics in R2 gravity with logarithmic trace term

E Elizalde, N Godani, GC Samanta - Physics of the Dark Universe, 2020 - Elsevier
A novel function for modified gravity is proposed, f (R, T)= R+ λ R 2+ 2 β ln (T), with constants
λ and β, scalar curvature R, and the trace of stress energy tensor T, satisfying T= ρ− 3 p> 0 …

Study on wormhole geometry with matter in modified gravity

N Godani, S Debata, SK Biswal… - The European Physical …, 2020 - Springer
In this work, static traversable wormholes are investigated in R^ 2 R 2 gravity with
logarithmic trace term T, where R denotes the Ricci scalar, and T=-ρ+ p_r+ 2p_t> 0 T=-ρ+ …

Velocity dispersion of dark-matter deficient ultradiffuse galaxies: A case for modified gravity

E Bhatia, S Chakrabarti, S Chakraborty - Physical Review D, 2023 - APS
The line of sight velocity dispersion of the ultradiffuse galaxies (UDGs) NGC1052-DF2 and
NGC1052-DF4 have been reasonably explained only with the baryonic matter, without …