Scientists from the Giant Excessive Altitude Air Bathe Observatory (LHAASO) have offered roughly 1.5 years of observational knowledge, calculating new limits on the lifetime of heavy dark matter particles which have plenty between 105 and 109 giga-electron volts.
The examine, titled “Constraints on heavy decaying dark matter from 570 days of LHAASO observations,” was not too long ago printed in Physics Evaluation Letters.
The gravitational mannequin of the Milky Way exhibits that there’s a very excessive density of dark matter within the galactic middle, and the gamma rays produced by the decay of this dark matter will radiate from the galactic center to the environment for a whole lot of light-years and even 1000’s of light-years. Nonetheless, for a very long time, the statement of ultra-high-energy gamma rays produced by heavy dark matter has been difficult by the presence of different background radiation.
Because of its unprecedentedly excessive detection sensitivity to ultra-high-energy gamma rays (>100 TeV), LHAASO has the very distinctive potential to watch gamma rays decaying from heavy dark matter. LHAASO can eradicate background occasions by practically six orders of magnitude above 100 TeV, which considerably reduces background interference and improves the power to seize gamma rays.
By utilizing knowledge from the KM2A subarray of LHAASO, scientists measured the depth of ultra-high-energy gamma rays past the galactic plane and place a number of the strongest restrict thus far for the lifetime of heavy dark matter. The restrict is almost 10 instances larger than earlier outcomes. This examine exhibits that PeV mass dark matter has a lifetime of not less than about billion trillion years (1021 years).
LHAASO’s observations of gamma rays are extremely complementary to different experiments within the seek for dark matter (resembling neutrino statement experiments). Because the LHAASO full array operates stably and progressively accumulates knowledge, this restrict will probably be additional elevated.
Extra data:
Zhen Cao et al, Constraints on Heavy Decaying Darkish Matter from 570 Days of LHAASO Observations, Bodily Evaluation Letters (2022). DOI: 10.1103/PhysRevLett.129.261103
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Chinese Academy of Sciences
Quotation:
First outcomes from LHAASO place tighter constraints on dark matter’s lifetime (2022, December 29)
retrieved 29 December 2022
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