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Future singularities and Teleparallelism in Loop Quantum Cosmology
Kazuharu Bamba, Jaume de Haro, Sergei D. Odintsov
We demonstrate how holonomy corrections in loop quantum cosmology (LQC) prevent the Big Rip singularity by introducing a quadratic modification in terms of the energy density i…
Cosmic history of viable exponential gravity: Equation of state oscillations and growth index from inflation to dark energy era
Kazuharu Bamba, Antonio Lopez-Revelles, R. Myrzakulov +2
A generic feature of viable gravity is investigated: It is demonstrated that during the matter dominated era the large frequency oscillations of the effective dark energy ma…
Dark energy cosmology: the equivalent description via different theoretical models and cosmography tests
Kazuharu Bamba, Salvatore Capozziello, Shin'ichi Nojiri +1
We review different dark energy cosmologies. In particular, we present the CDM cosmology, Little Rip and Pseudo-Rip universes, the phantom and quintessence cosmologies with Type…
Periodic Cosmological Evolutions of Equation of State for Dark Energy
Kazuharu Bamba, Ujjal Debnath, Kuralay Yesmakhanova +3
We demonstrate two periodic or quasi-periodic generalizations of the Chaplygin gas (CG) type models to explain the origins of dark energy as well as dark matter by using the Weiers…
Reconstruction of the equation of state for the cyclic universes in homogeneous and isotropic cosmology
Kazuharu Bamba, Kuralay Yesmakhanova, Koblandy Yerzhanov +1
We study the cosmological evolutions of the equation of state (EoS) for the universe in the homogeneous and isotropic Friedmann-Lemaître-Robertson-Walker (FLRW) space-time. In part…
Thermodynamics of a Schwarzschild Black Hole in Phantom Cosmology with Entropy Corrections
Mubasher Jamil, D. Momeni, Kazuharu Bamba +1
Motivated by some earlier works \cite{pavon,sadjadi} dealing with the study of generalized second law (GSL) of thermodynamics for a system comprising of a Schwarzschild black accre…
Equation of State for Dark Energy in Modified Gravity Theories
Kazuharu Bamba
We explore the equation of state (EoS) for dark energy in modified gravitational theories to explain the current accelerated expansion of the universe. We explici…
Reconstruction of gravity: Rip cosmology, finite-time future singularities and thermodynamics
Kazuharu Bamba, Ratbay Myrzakulov, Shin'ichi Nojiri +1
We demonstrate that there appear finite-time future singularities in gravity with being the torsion scalar. We reconstruct a model of gravity with realizing the f…