Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2009-12-17
JHEP 1004:058,2010
Physics
High Energy Physics
High Energy Physics - Phenomenology
19 pages. Version accepted for publication in JHEP.
Scientific paper
10.1007/JHEP04(2010)058
We examine under what circumstances the INTEGRAL/SPI 511 keV signal can originate from decays of MeV-scale composite states produced by: (A) thermonuclear (type Ia) or (B) core collapse supernovae (SNe). The requisite dynamical properties that would account for the observed data are quite distinct, for cases (A) and (B). We determine these requirements in simple hidden valley models, where the escape fraction problem is naturally addressed, due to the long lifetime of the new composite states. A novel feature of scenario (A) is that the dynamics of type Ia SNe, standard candles for cosmological measurements, might be affected by our mechanism. In case (A), the mass of the state mediating between the hidden sector and the SM $\ee$ could be a few hundred GeV and within the reach of a 500 GeV $\ee$ linear collider. We also note that kinetic mixing of the photon with a light vector state may provide an interesting alternate mediation mechanism in this case. Scenarios based on case (B) are challenged by the need for a mechanism to transport some of the produced positrons toward the Galactic bulge, due to the inferred distribution of core collapse sources. The mass of the mediator in case (B) is typically hundreds of TeV, leading to long-lived particles that could, under certain circumstances, include a viable dark matter candidate. The appearance of long-lived particles in typical models leads to cosmological constraints and we address how a consistent cosmic history may be achieved.
Davoudiasl Hooman
Perez Gilad
No associations
LandOfFree
The INTEGRAL/SPI 511 keV Signal from Hidden Valleys in Type Ia and Core Collapse Supernova Explosions does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The INTEGRAL/SPI 511 keV Signal from Hidden Valleys in Type Ia and Core Collapse Supernova Explosions, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The INTEGRAL/SPI 511 keV Signal from Hidden Valleys in Type Ia and Core Collapse Supernova Explosions will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-348563