Effects of Matter Lagrangian in f(Q,T) Gravity: The Accelerating Cosmological Model Rahul Bhagat, I. V. Fomin, B. Mishra Annalen Der Physik, 2026 We investigate the logarithmic form of gravity with two different choices of matter Lagrangian such as: and . The parameters of the model have been constrained using Cosmic Chronometers (CC) in combination with DES‐SN5YR, Type Ia supernova and DESI DR2 (BAO) datasets. We have observed that the deceleration parameter shows a smooth transition from deceleration to acceleration phase and the effective equation of state parameter () approaches at late times. The diagnostic exhibits a decreasing profile, confirming quintessence‐like behavior, and the state finder analysis demonstrates trajectories that remain near the fixed point but deviate into the quintessence region. The evolution of the density parameters satisfies the flatness condition, and the predicted age of the Universe lies within Gyr, consistent with CMB and stellar estimates. The findings indicate that the logarithmic model successfully reproduces the late‐time accelerated expansion for both the choices of the matter Lagrangian.
Logarithmic and Strong Coupling Models in Weyl-Type f(Q,T) Gravity Rahul Bhagat, S. K. Tripathy, B. Mishra Annalen Der Physik, 2026 In this study, the cosmological implications of Weyl‐type gravity are explored, a modified gravitational theory formulated from Weyl geometry. The nonmetricity scalar is coupled to the trace of the energy‐momentum tensor. Two models are analyzed based on the logarithmic and strong coupling form of the function . The corresponding field equations are then solved numerically after reformulating the system in terms of redshift. The joint datasets CC+Union3.0+DESI DR2 and CC++DESI DR2 are employed to perform a Markov Chain Monte Carlo (MCMC) analysis for constraining the model parameters. Using the constrained parameters, the geometrical and dynamical aspects of the models are analyzed. The results successfully describe a transition from decelerated to accelerated expansion for both models. Both models exhibit quintessence‐like behavior and approach the scenario at the present epoch (). The Logarithmic model closely follows , approaching at late times, while the strong coupling model shows similar deceleration for but transitions to phantom‐like behavior (), suggesting a super‐accelerated future expansion. The calculated age of the universe from each model aligns with constraints from Planck and stellar age data. The violation of the strong energy condition and the satisfaction of null energy condition and dominant energy condition are shown.
Phase space analysis in gravity with scalar field YK Devi, R Bhagat, B Mishra arXiv preprint arXiv:2603.29337 , 2026 2026
Phase space analysis in gravity with scalar field Y Kalpana Devi, R Bhagat, B Mishra arXiv e-prints, arXiv: 2603.29337 , 2026 2026
Effects of Matter Lagrangian in f(Q,T) Gravity: The Accelerating Cosmological Model R Bhagat, IV Fomin, B Mishra Annalen der Physik 538 (3), e00001 , 2026 2026 Citations: 3
Logarithmic and Strong Coupling Models in Weyl‐Type f (Q, T) f(Q,T) Gravity R Bhagat, SK Tripathy, B Mishra Annalen der Physik 538 (1), e00429 , 2026 2026 Citations: 4
Accelerating behavior from dynamical system analysis parameters R Bhagat, B Mishra Journal of High Energy Astrophysics, 100483 , 2025 2025 Citations: 4
Exploring the Viability of Gravity: Constraining Parameters with Cosmological Observations R Bhagat, SV Lohakare, B Mishra Physics of the Dark Universe 49, 102048 , 2025 2025 Citations: 12
Tracing cosmic evolution through Weyl-Type f (Q, T) gravity model: Theoretical analysis and observational validation R Bhagat, F Tello-Ortiz, B Mishra Physics of the Dark Universe 48, 101913 , 2025 2025 Citations: 13
Observational constrained Weyl type f (Q, T) gravity cosmological model and the dynamical system analysis R Bhagat, B Mishra Astroparticle Physics 163, 103011 , 2024 2024 Citations: 14
Constrained cosmological model in f (Q, T) gravity with non-linear non-metricity R Bhagat, SA Narawade, B Mishra, SK Tripathy Physics of the Dark Universe 42, 101358 , 2023 2023 Citations: 15
Weyl type f (Q, T) gravity observational constrained cosmological models R Bhagat, SA Narawade, B Mishra Physics of the Dark Universe 41, 101250 , 2023 2023 Citations: 20
MOST CITED SCHOLAR PUBLICATIONS
Weyl type f (Q, T) gravity observational constrained cosmological models R Bhagat, SA Narawade, B Mishra Physics of the Dark Universe 41, 101250 , 2023 2023 Citations: 20
Constrained cosmological model in f (Q, T) gravity with non-linear non-metricity R Bhagat, SA Narawade, B Mishra, SK Tripathy Physics of the Dark Universe 42, 101358 , 2023 2023 Citations: 15
Observational constrained Weyl type f (Q, T) gravity cosmological model and the dynamical system analysis R Bhagat, B Mishra Astroparticle Physics 163, 103011 , 2024 2024 Citations: 14
Tracing cosmic evolution through Weyl-Type f (Q, T) gravity model: Theoretical analysis and observational validation R Bhagat, F Tello-Ortiz, B Mishra Physics of the Dark Universe 48, 101913 , 2025 2025 Citations: 13
Exploring the Viability of Gravity: Constraining Parameters with Cosmological Observations R Bhagat, SV Lohakare, B Mishra Physics of the Dark Universe 49, 102048 , 2025 2025 Citations: 12
Logarithmic and Strong Coupling Models in Weyl‐Type f (Q, T) f(Q,T) Gravity R Bhagat, SK Tripathy, B Mishra Annalen der Physik 538 (1), e00429 , 2026 2026 Citations: 4
Accelerating behavior from dynamical system analysis parameters R Bhagat, B Mishra Journal of High Energy Astrophysics, 100483 , 2025 2025 Citations: 4
Effects of Matter Lagrangian in f(Q,T) Gravity: The Accelerating Cosmological Model R Bhagat, IV Fomin, B Mishra Annalen der Physik 538 (3), e00001 , 2026 2026 Citations: 3
Phase space analysis in gravity with scalar field YK Devi, R Bhagat, B Mishra arXiv preprint arXiv:2603.29337 , 2026 2026
Phase space analysis in gravity with scalar field Y Kalpana Devi, R Bhagat, B Mishra arXiv e-prints, arXiv: 2603.29337 , 2026 2026
