Abstract
Dark matter may interact with Standard Model (SM) particle through the exchange of a massive spin-2 graviton producing signals that can be detected. In this work we examine the γ-ray emission signals, including the line emission and the continuous spectrum component in such a massive graviton-mediated dark matter model. The constraints of LHC data, dark matter relic density as well as the dark matter indirect detection data have been applied to narrow down the parameter space. We focus on the vector dark matter model which could produce detectable γ-ray line signal. It is found that the γ-ray line data is effective on constraining the model parameters and the ongoing and upcoming space or ground-based γ-ray experiments can constrain the model further. As for the continuous γ-ray emission, the total effective annihilation cross section is ∼10−26 cm3s−1 except at the region where dark matter mass is around the graviton mass or half of it, which is consistent with current observational data and will be reliably probed by the upcoming CTA.
Highlights
Dark Matter (DM) consists of 26 percent of the total energy and 84 percent of the total mass of the current universe in ΛCDM cosmology [1]
In this work we studied the γ-ray signal in the massive graviton mediated dark matter model where the dark matter interact with Standard Model (SM) gauge bosons through the exchange of massive graviton
For our purpose we focused on vector dark matter for which the annihilation cross section of χχ → γγ is not suppressed, which is important for dark matter indirect detection since no other known physical processes can yield lines in GeV-TeV energy range and the successful detection will be taken as the discovery of dark matter particles
Summary
Dark Matter (DM) consists of 26 percent of the total energy and 84 percent of the total mass of the current universe in ΛCDM cosmology [1]. Several types of experiments are designed to detect the dark matter particles (i.e., the so-called direct, indirect and collider detection). The Large Hadron Collider (LHC) is searching the dark matter particles events with different final states produced in hadron collisions [7, 8, 9, 10]. If dark matter could collide with nuclei, the recoiled nucleus can be detected directly. Such experiments are usually done in underground laboratory to avoid the interference of cosmic rays, such as LUX [19], Xenon [20], CDEX [21] and PandaX-II [22]
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