IWARA2026 - 12th International Workshop on Astronomy and Relativistic Astrophysics

The pseudo-complex FLRW model and the time evolution of the Hubble parameter

Not scheduled

20m

Auditorio José Adem, Mexico

Talk

Speakers

Prof. Cesar Augusto Zen Vasconcellos (ICRANet)Prof. Fridolin Weber (University of California at San Diego) Leila Maghlaoui (Mentouri Univeristy) Peter Hess

Description

The pseudo-complex version of the Friedmann–Lemaître–Robertson–
Walker model (pcFLRW) is presented within the framework of pseudo-complex
General Relativity (pcGR). In this approach, dark energy arises as a geometric
consequence of the pseudo-complex structure, leading to a time-dependent
Hubble parameter H(z), which at the present time yields a value H0 and, crucially,
a non-zero time derivative ˙H0. The relation between the time derivative
of the Hubble parameter and a single geometric parameter β in the effective
dark-energy equation of state is derived and constrained using recent DESI
BAO data. Fitting β yields a best-fit value β = 1.0426+-0.0144 and a present-day Hubble acceleration dH0/dt ≃ (0.94 +- 0.32) × 10−17 (km/s2)/Mpc.
In pcGR, however, the non-vanishing ˙H0 is a direct geometric prediction,