2025/10/17 by Luciano, G. G., Paliathanasis, A., Sheykhi, A.
#Cosmology and Nongalactic Astrophysics (astro-ph.CO) #FOS: Physical sciences #General Relativity and Quantum Cosmology (gr-qc) #High Energy Physics - Theory (hep-th)
paper · doi:10.48550/arxiv.2510.16228
We explore the cosmological consequences of a modified cosmology inspired by string T-duality. We incorporate the zero-point length correction, l0, into the gravitational potential and derive the modified Friedmann equations via thermodynamic approach at the apparent horizon of a Friedmann-Robertson-Walker (FRW) universe. The resulting framework introduces a dimensionless coupling parameter β∼ l02H02 quantifying deviations from the standard ΛCDM model. Using Bayesian inference with Cobaya and MCMC sampling, we constrain the model parameter against late-time observations, including PantheonPlus and Union3 Type~Ia supernovae, cosmic chronometers, DESI~DR2 BAO measurements, and Amati-calibrated GRBs. The joint analysis yields an upper bound β\lesssim O(10-3) (68% C.L.), implying that departures from ΛCDM are extremely small within current precision. Model comparison through the Akaike Information Criterion shows that the ΛCDM and T-duality models provide statistically equivalent fits to the data, exhibiting only a marginal preference for ΛCDM. These results provide the first quantitative observational constraints on string T-duality inspired modified cosmology and underscore the potential of future high-precision surveys to test quantum-gravity induced corrections in a late-time universe.