CACan Aktaş

Can Aktaş

Çanakkale Onsekiz Mart Üniversitesi
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Can Aktaş has a total of 31 co-authors. Here are the top co-authors by number of shared publications:

Latest Publications

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    Statefinder analysis of Kaniadakis holographic dark energy in f(R,T) theory with Bianchi I cosmology

    by Sinem Kalkan, Melike Esgin, Can Aktaş

    This study investigates the Kaniadakis holographic dark energy (KHDE) model under the [Formula: see text] theory of gravity within the framework of the Bianchi I model of the universe. The dynamic evolution of the universe is analyzed using redshift and statefinder parameters. The Hubble parameter is applied as an auxiliary equation in solving the field equations, and the anisotropic properties of the model are discussed in detail. The physical validity of the solution is examined in greater detail through energy conditions. The results reveal the evolutionary properties of KHDE under the [Formula: see text] theory and the dynamic-anisotropic behavior of the universe.

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    Analytical and observational analysis of Barrow entropy-based holographic dark energy in f(R,T) theory

    by Murat Taştan, Can Aktaş

    In this study, the Barrow Holographic Dark Energy (BHDE) model is investigated within the [Formula: see text] gravity scope using a Kaluza–Klein metric. The relevant field equations are derived and solved using the Hubble parameter and the BHDE density, thereby determining the fundamental cosmological quantities of the model. To ensure physical viability, the free parameters of the model are constrained using the optimized parameters obtained from a joint statistical analysis of BAO, [Formula: see text] and Pantheon datasets. The dynamical evolution of fundamental cosmological quantities, such as the deceleration parameter, equation of state (EoS), energy densities, and statefinder diagnostic, is analyzed. The obtained results indicate that the model exhibits a transition from a decelerating to an accelerating expansion phase, and the evolutionary behaviors of the parameters reflect the general dynamics of a dark energy-dominated universe.

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    Analytical Study of Bouncing Cosmology in f(Q,C) Gravity With Generalized Infrared Cutoffs

    by Moli Ghosh, C. Aktas, Surajit Chattopadhyay

    Cited by 2
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    Reconstructing f(T) gravity and exploring the torsion driven warm inflationary cosmology

    by Moli Ghosh, Can Aktaş, Surajit Chattopadhyay

    The current paper reports an investigation of a warm inflationary scenario in the context of f(T) gravity for a spatially flat FLRW universe. In our model, inflation is driven purely by the torsional sector of f(T) gravity, without introducing any additional scalar fields. We focus on the high dissipative regime ( $$R \gg 1$$ R ≫ 1 ), reconstruct the Hubble parameter as a function of the e-folding number N, and derive the slow-roll parameters $$\varepsilon _1(N)$$ ε 1 ( N ) and $$\varepsilon _2(N)$$ ε 2 ( N ) . The study has encapsulated the dynamics of inflation and its duration under strong dissipation. The dissipative coefficient $$\Gamma $$ Γ is modeled with a temperature-dependent power-law form, linking the inflationary dynamics to thermal corrections and the particle content of the early universe. The analysis has affirmed that the torsion-induced energy density $$\rho _T$$ ρ T successfully transitions to radiation energy density $$\rho _{rad}$$ ρ rad , facilitating a graceful exit from inflation. Finally, we have validated our model by comparing the scalar spectral index and tensor-to-scalar ratio with Planck 2018 results, demonstrating consistency within observational bounds. Additionally, it is verified that the thermal domination condition $$T_{*}/H > 1$$ T ∗ / H > 1 and the torsion dominance condition $$\rho _T/\rho _{rad} > 1$$ ρ T / ρ rad > 1 are satisfied.

    Cited by 4
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    Renyi Entropy Based Dark Energy Models in Bianchi I Cosmology

    by Mutlu Battaloğlu, Can Aktaş

    In this study, the Renyi holographic dark energy (RHDE) model is analyzed in the framework of the f(R, T) theory for the homogeneous anisotropic Bianchi metric. For this purpose, field equations are obtained in f(R, T) theory and Hubble parameter and energy density of Renyi holographic dark energy are utilized to obtain exact solutions of these equations. The obtained solutions were plotted using four different data sets and the models were analyzed in detail with the help of these plots.

    Cited by 1
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    A Dynamic Analysis of Cosmic Strings in the $f(R,T)$ Gravity Model

    by Nevruz Taş, Can Aktaş

    This study investigates the dynamics of cosmic strings within the framework of the $f(R,T)$ gravity model, a modified theory of gravity proposed by Harko et al. in 2011. The $f(R,T)$ theory extends Einstein’s general relativity by including functions of the Ricci scalar ($R$) and the trace of the energy-momentum tensor ($T$). Using the Friedman-Robertson-Walker (FRW) universe model, the study derives the field equations and explores the behavior of the key cosmological parameters, such as the scale factor, string energy density, cosmological term, deceleration parameter, and Hubble parameter. The analytical solutions show that the universe expands continuously with the increasing scale factor values. The study also demonstrates that energy density and the cosmological term decrease over time, while the Hubble parameter exhibits a similar declining trend. The results indicate that the model aligns well with the observed accelerated expansion of the current universe. These findings provide valuable insights into the role of cosmic strings and modified gravity theories in explaining large-scale cosmic evolution.

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    Behaviors of dark energy candidates in the Ruban universe

    by Melike Esgin, Can Aktaş

    In this study, we investigated quintessence and tachyon field dark energy (DE) models for the inhomogeneous and anisotropic Ruban universe in [ ] gravitation theory. We utilized the Hubble parameter in the field equations as [ ] for the solutions. Since DE candidates are classified according to the [ ] values of the EoS parameter [ ], we obtained the p and [ ] solutions for each DE candidate and analyzed the scalar field (SF) and scalar potential solution. We also talked about the model’s physical characteristics and parameters with the help of a various of graphics for redshift z and cosmic time t. Additionally, the statefinder parameters, which are essential tools for distinguishing various dark energy models, have been explored.

    Cited by 2
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    Behavior of Tsallis holographic dark energy for Marder universe

    by Can Aktaş

    In this study, Tsallis holographic dark energy (THDE) was discussed within the frame of [ ] gravitational theory and considering the homogeneous and anisotropic Marder universe. The Hubble horizon was taken into consideration as infrared cutoff of the system. To get the field equations, solutions were used for the THDE density and the anisotropy parameter. Furthermore, a variety of physical parameters such as deceleration parameter, anisotropy parameter and volume have been examined. They have been also been visually examined with the help of graphics. Different values of deceleration parameter consistent with different observational data were mentioned. In addition to this, cosmological parameters like jerk, lerk and snap parameters were analyzed. Statefinder diagnostics which are helpful tools for the separation of dark energy models have been examined. By the calculation and representation of the overall density parameter ([ ]) it can be concluded that the anisotropic nature of model vanishes showing a tendency to isotropy in accordance with present universe. Finally, the physical and geometrical nature of the model was studied, collating with relevant studies and observations.

    Cited by 1
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    Scalar Fields for Bianchi-I Model in $\boldsymbol{f(R,T)}$ Theory of Gravity

    by Yasemin Kabaoğlu, Can Aktaş

    In physics and cosmology, scalar fields are considered basic. In this study, we are interested to inspect the conduct of massless scalar field (SF) and massive scalar field (MSF) models in \(f(R,T)\) theory for Bianchi-I universe models. We discuss two cosmological models with respect to late cosmic acceleration, using constant scalar potential and exponential scalar potential models. Also, we study the behavior of a massive scalar field. Finally, we obtain our results in \(f(R,T)\) and general relativity (GR). In addition, we obtained an LRS Bianchi-I metric as a result of the solutions we made and selection of special constants.

    Cited by 2
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    Homogeneous and anisotropic universe models with bouncing deceleration parameter in $f(R,T)$ theory

    by Aysel Kızılcık, Can Aktaş

    In this study, we have investigated the cloud of string with perfect fluid (CSPF) matter distribution for the homogeneous and anisotropic (Bianchi I, III, and Kantowski-Sachs) universe models in the $f(R,T)$ theory. We have used the\, bouncing\, deceleration parameter, anisotropy parameter, and equation of state to obtain the exact solutions of field equations. The obtained physical and kinematic quantities were analyzed with the help of graphics. If the anisotropy parameter is zero, then our model becomes an isotropic model of the universe and the string tension vanishes in LRS Bianchi I metric. Finally, we discuss the need for further research.

    Cited by 2
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