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gr-qc2026
Stationary solutions in the small- expansion of GR
Enes Bal, ErtuÄrul Ekiz, Emre Onur Kahya +1
We study the small- expansion of general relativity in ADM variables up to next-to-next-to-leading order (NNLO). We show that, in the stationary sector, this formulation renders…
astro-ph.CO2026
Do equation of state parametrizations of dark energy faithfully capture the dynamics of the late universe?
Ãzgür Akarsu, Maria Caruana, Konstantinos F. Dialektopoulos +3
We investigate how strongly late-time inferences about DE dynamics depend on the functional prior used to represent the expansion history. Using identical late-time combinations of…
astro-ph.CO2026
Hints of sign-changing scalar field energy density and a transient acceleration phase at from model-agnostic reconstructions
Ãzgür Akarsu, Maria Caruana, Konstantinos F. Dialektopoulos +3
We present a data-driven reconstruction of the late-time expansion history and its implications for dark-energy dynamics. Modeling the reduced Hubble rate with a node-based Gaussia…