2004/10/22 by Elisabetta Majerotto, Majerotto, Elisabetta, Domenico Sapone +4 · 3 citations
Physics and Astronomy · #Astrophysics (astro-ph) #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #FOS: Physical sciences #Gamma-ray bursts and supernovae #General Relativity and Quantum Cosmology (gr-qc) #High Energy Physics - Theory (hep-th) #astro-ph #gr-qc #hep-th
paper · pdf · doi:10.48550/arxiv.astro-ph/0410543
10 pages, 14 figures, to be submitted to JCAP; v2: minor changes, added a plot and reference updates
openalex publication_date 2004/10/22 · arxiv created 2005/03/02 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We estimate the constraints that the recent high-redshift sample of supernovae type Ia put on a phenomenological interaction between dark energy and dark matter. The interaction can be interpreted as arising from the time variation of the mass of dark matter particles. We find that the coupling correlates with the equation of state: roughly speaking, a negative coupling (in our sign convention) implies phantom energy (wϕ-1) are unlikely at 95%. We show also that the usual bounds on the energy density weaken considerably when the coupling is introduced: values as large as Ωm0=0.7 become acceptable for as concerns SNIa. We find that the rate of change of the mass m/m of the dark matter particles is constrained to be δ0 in a Hubble time, with -10