9 papers
Causal Gravitational-Wave Production Does Not Generate Infrared Adiabatic Curvature
Ruth Durrer, Alessandro Melchiorri
Short tensor modes can generate a white noise contribution to the local scalar , but this does not induce an infrared-enhanced adiabatic curvature spectrum. For a c…
The Rotation Curve of the Milky Way: State of the Art, the Keplerian Decline Debate, and Implications for Dark Matter
Alessandro Melchiorri, Ruchika
For four decades, the roughly flat rotation curve (RC) of the Milky Way (MW) stood as local evidence for an extended dark matter (DM) halo. \textit{Gaia} DR3 has changed the pictur…
Present Day Cosmic Acceleration from SDSS and DESI BAO: A Call for Finer Tomography of the DESI Bright Galaxy Survey
Anna Chiara Ferri, Ruchika, Alessandro Melchiorri
The DESI collaboration's Data Release~2 (DR2) provides baryon acoustic oscillation (BAO) measurements from over 14 million galaxies and quasars, and a joint analysis of DESI BAO, C…
Investigating -Inflation: background evolution and constraints
Elisa Fazzari, Chiara De Leo, Giovanni Montani +3
In this work, we investigate the possibility of generating an inflationary mechanism within the framework of a metric- modified gravity theory, formulated in the Jordan frame…
The effective running Hubble constant in SNe Ia as a marker for the dark energy nature
E. Fazzari, M. G. Dainotti, G. Montani +1
We propose a new method that reveal the nature of dark energy (DE) evolution. Specifically, the method consists of studying the evolving trend regarding the effective running Hubbl…
Running Einstein Constant and a Possible Vacuum State of the Universe
Giovanni Montani, Giulia Maniccia, Elisa Fazzari +1
We propose a revised formulation of General Relativity for cosmological settings, in which the Einstein constant varies with the energy density of the Universe. We demonstrate that…