Strong CMB constraint on P-wave annihilating dark matter
نویسندگان
چکیده
منابع مشابه
Strong CMB Constraint On P -Wave Annihilating Dark Matter
We consider a dark sector consisting of dark matter that is a Dirac fermion and a scalar mediator. This model has been extensively studied in the past. If the scalar couples to the dark matter in a parity conserving manner then dark matter annihilation to two mediators is dominated by the P -wave channel and hence is suppressed at very low momentum. The indirect detection constraint from the an...
متن کاملThe Structure of Dark Matter Halos in an Annihilating Dark Matter Model
The inability of standard non-interacting cold dark matter (CDM) to account for the small scale structure of individual galaxies has led to the suggestion that the dark matter may undergo elastic and/or inelastic scattering. We simulate the evolution of an isolated dark matter halo which undergoes both scattering and annihilation. Annihilations produce a core that grows with time due to adiabat...
متن کاملAnnihilating Dark Matter and the Galactic Positron Excess
The possibility that the Galactic dark matter is composed of neutralinos that are just above half the Z mass is examined, in the context of the Galactic positron excess. In particular, we check if the anomalous bump in the cosmic ray positron to electron ratio at 10 GeV can be explained with the “decay” of virtual Z bosons produced when the neutralinos annihilate. We find that the low energy be...
متن کاملA closer look at CMB constraints on WIMP dark matter
We use Cosmic Microwave Background data from the WMAP, SPT, BICEP, and QUaD experiments to obtain constraints on the dark matter particle mass mχ, and show that the combined data requires mχ > 7.6 GeV at the 95% confidence level for the χχ→ bb̄ channel assuming s−wave annihilation and a thermal cross section 〈σav〉 = 3× 10−26 cm3/s. We examine whether the bound on mχ is sensitive to σ8 measuremen...
متن کاملCmb Constraints on a Baryonic Dark Matter-dominated Universe
In recent years, upper limits on the cosmic microwave background (CMB) anisotropies combined with predictions made by theories of galaxy formation, have been extremely powerful in ruling out purely baryonic dark matter (BDM) universes. However, it has recently been argued that the absence of a prominent second peak in the anisotropy spectrum measured by the BOOMERanG-98 and MAXIMA-1 experiments...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Physics Letters B
سال: 2017
ISSN: 0370-2693
DOI: 10.1016/j.physletb.2017.08.010