Description
In this work, we present a unified cosmological scenario within the framework of holographic
f(Q) gravity, addressing both early-time inflation and late-time cosmic acceleration. For the
inflationary epoch, we reconstruct the Hubble parameter using holographic dark energy (HDE)
and derive the key inflationary observables, namely the scalar spectral index and the tensor-to
scalar ratio. Our results demonstrate excellent consistency with the latest Planck satellite data,
validating the viability of the model during the early universe. For the late-time cosmology, we
incorporate a matter sector and employ the Chevallier-Polarski-Linder (CPL) parameterization
to characterize the dark energy equation of state. We perform a comprehensive Bayesian sta
tistical analysis using a joint dataset of 31 Cosmic Chronometer (CC) and 26 Baryon Acoustic
Oscillation (BAO) observations. Markov Chain Monte Carlo (MCMC) sampling is utilized
to constrain the free parameters, and we present the corresponding confidence contour plots.
The combined analysis reveals that the holographic f(Q) gravity model successfully accom
modates both inflationary and late-time accelerated expansion phases within a single theoretical
framework, offering a compelling alternative to standard ΛCDM cosmology
