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gr-qc2026
Non-Markovian Cosmology with Causal Memory Kernels
Aritra Sanyal, Prabir Rudra
We investigate a non-Markovian extension of Friedmann cosmology in which the present expansion rate retains information about the past cosmic evolution through a causal memory kern…
gr-qc2026
Evolving wormhole cosmology: modified Friedmann dynamics and observational constraints
Aritra Sanyal, Kazuharu Bamba, Prabir Rudra
We construct an evolving wormhole cosmological model from a Morris--Thorne metric with a separable, time-dependent shape function in a spatially flat Friedmann--Lemaitre--Robertson…
gr-qc2026
Interplay of Holographic and New Agegraphic Dark Energy in Cosmology: A hybrid dark energy model from a generalized length-time cut-off
Sayani Maity, Aritra Sanyal, Prabir Rudra
The spatial and temporal infrared cutoffs are the source of the Holographic dark energy (HDE) and New Agegraphic dark energy (NADE) models, respectively. Inspired by the spacetime…