Scientists from the Giant Excessive Altitude Air Bathe Observatory (LHAASO) have introduced roughly 1.5 years of observational knowledge, calculating new limits on the lifetime of heavy darkish matter particles which have lots between 10^5 and 10^9 giga-electron volts.
The examine, entitled “Constraints on heavy decaying darkish matter from 570 days of LHAASO observations,” was not too long ago printed as a spotlight letter in Physics Evaluation Letter.
Till now, folks have by no means stopped revealing the mysteries of darkish matter and its fundamental properties. The gravitational mannequin of the Milky Method reveals that there’s a very excessive density of darkish matter within the galactic heart, and the gamma rays produced by the decay of this darkish matter will radiate from the galactic heart to the environment for lots of 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 darkish matter has confronted nice challenges, primarily due to 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 look at gamma rays decaying from heavy darkish matter. LHAASO can remove background occasions by almost six orders of magnitude above 100 TeV, which considerably reduces background interference and improves the flexibility to seize gamma rays.
Through the use of knowledge from the KM2A subarray of LHAASO, scientists measured the depth of ultra-high-energy gamma rays past the galactic aircraft and place a number of the strongest restrict up to now for the lifetime of heavy darkish matter. The restrict is sort of 10 occasions greater than earlier outcomes. This examine reveals that PeV mass darkish matter has a lifetime of at the least about billion trillion years (10^21 years).
LHAASO’s observations of gamma rays are extremely complementary to different experiments within the seek for darkish matter (corresponding to neutrino statement experiments). Because the LHAASO full array operates stably and regularly accumulates knowledge, this restrict might be additional elevated.
This examine was carried out by Profs. LI Zhe and CHEN Songzhan from the Institute of Excessive Power Physics of the Chinese language Academy of Sciences, Prof. Kenny C. Y. Ng from the Chinese language College of Hong Kong, and Dr. Marco Chianese from the College of Naples Federico II in Italy.
Analysis Report:Constraints on Heavy Decaying Dark Matter from 570 Days of LHAASO Observations
Associated Hyperlinks
Large High Altitude Air Shower Observatory
Stellar Chemistry, The Universe And All Within It
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Scientists find new hints that dark matter could be made up of dark photons
Trieste. Italy (SPX) Dec 13, 2022
Darkish matter could possibly be made up of ultralight darkish photons that heated up our universe: it is a new situation proposed in a examine not too long ago printed within the scientific journal “Bodily Evaluation Letters”. This speculation, the authors say, is in glorious settlement with observations made by the Cosmic Origin Spectrograph (COS) on board the Hubble Area Telescope, which takes measurements of the “cosmic net”, the complicated and tenuous community of filaments that fills the house between galaxies.
intergalacti … read more
