Can Dark Matter Decay in Dark Energy?
| dc.creator | Pereira, S. H. | |
| dc.creator | Jesus, J. F. | |
| dc.date | 2008-11-01 | |
| dc.date | 2009-02-26 | |
| dc.date.accessioned | 2026-07-07T12:46:32Z | |
| dc.date.available | 2026-07-07T12:46:32Z | |
| dc.description | We analyze the interaction between Dark Energy and Dark Matter from a thermodynamical perspective. By assuming they have different temperatures, we study the possibility of occurring a decay from Dark Matter into Dark Energy, characterized by a negative parameter $Q$. We find that, if at least one of the fluids has non vanishing chemical potential, for instance $μ_x<0$ and $μ_{dm}=0$ or $μ_x=0$ and $μ_{dm}>0$, the decay is possible, where $μ_x$ and $μ_{dm}$ are the chemical potentials of Dark Energy and Dark Matter, respectively. Using recent cosmological data, we find that, for a fairly simple interaction, the Dark Matter decay is favored with a probability of $\sim 93%$ over the Dark Energy decay. This result comes from a likelihood analysis where only background evolution has been considered. | |
| dc.description | Matches the published version. Section V changed. Formalism and main conclusion unchanged | |
| dc.identifier | https://arxiv.org/abs/0811.0099 | |
| dc.identifier | http://arxiv.org/abs/0811.0099 | |
| dc.identifier | Phys. Rev. D 79, 043517 (2009) | |
| dc.identifier | doi:10.1103/PhysRevD.79.043517 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/221417 | |
| dc.subject | Astrophysics | |
| dc.title | Can Dark Matter Decay in Dark Energy? | |
| dc.type | text |