17 papers
Effective Constrained Scalar--Gauss--Bonnet Inflation Motivated by Gravity
G. G. L. Nashed, Sudan Hansraj, Amare Abebe
We develop an effective framework for inflation in a constrained scalar--Gauss--Bonnet theory motivated by a restricted sector of gravity. Using unified parametr…
Rotating traversable wormholes and particle dynamics in gravity
G. G. L. Nashed, Waleed El Hanafy, Amare Abebe +2
Traversable wormholes are among the most interesting solutions of gravitational theories, but within General Relativity they generally require exotic matter violating the null ener…
Alleviating the Hubble Tension Using sCDM Model: A Coupled Dark Energy - Dark Matter Interaction
Yismaw Wassie Ambelu, Amare Abebe, Solomon Belay Tessema +1
The considerable difference between early and late universe measurements of the Hubble constant, called the Hubble tension, poses a potential challenge to the standard CDM cosm…
Light Deflection and Greybody Bound Around a BTZ-ModMax Black Hole in Plasma Medium
Ritesh Pandey, Shubham Kala, Amare Abebe +2
We study the deflection of light in a homogeneous plasma medium around a BTZ-ModMax black hole, focusing on the effects of the ModMax nonlinear electrodynamics parameter and the co…
Cosmological Tensions as Consistency Conditions for f(Q) Gravity
Amare Abebe
Cosmology has entered a precision era in which discrepancies between independent datasets, most notably the and tensions, have become robust and statistically significa…
Gravitational lensing around a Kerr-Sen black hole in plasma background
Saswati Roy, Shubham Kala, Sayanika Modak +2
We investigate the gravitational lensing of massless particles around a Kerr-Sen black hole immersed in a magnetized, cold, pressureless plasma medium. Both homogeneous and inhomog…