Scalar field "mini-MACHOs": A new explanation for galactic dark matter

Xavier Hernández, Tonatiuh Matos, Roberto A. Sussman, Yosef Verbin

Research output: Contribution to journalArticlepeer-review


We examine the possibility that galactic halos are collisionless ensembles of scalar field "massive compact halo objects" (MACHOs). Using mass constraints from MACHO microlensing and from theoretical arguments on halos made up of massive black holes, as well as demanding also that scalar MACHO ensembles of all scales do not exhibit gravothermal instability (as required by consistency with observations of LSB galaxies), we obtain the range: m≲ 10-7M ⊙or 30M ⊙≲m ≲100M ⊙. The rather narrow mass range of large MACHOs seems to indicate that the ensembles we are suggesting should be probably made up of scalar MACHOs in the low mass range ("mini-MACHOs"). The proposed model allows one to consider a nonbaryonic and nonthermal fundamental nature of dark matter, while at the same time keeping the same phenomenology of the CDM paradigm.

Original languageEnglish
Article number043537
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Issue number4
StatePublished - Aug 2004


Dive into the research topics of 'Scalar field "mini-MACHOs": A new explanation for galactic dark matter'. Together they form a unique fingerprint.

Cite this