English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Following previous study, in the Littlest Higgs model (LHM), the heavy photonis supposed to be a possible dark matter candidate and its relic abundance ofthe heavy photon is estimated in terms of the Boltzman-Lee-Weinbergtime-evolution equation. The effects of the T-parity violation is alsoconsidered. Our calculations show that when Higgs mass $M_H$ taken to be 300GeV and don't consider T-parity violation, only two narrow ranges$133<M_{A_{H}}<135$ GeV and $167<M_{A_{H}}<169$ GeV are tolerable with thecurrent astrophysical observation and if $135<M_{A_{H}}<167$ GeV, there must atleast exist another species of heavy particle contributing to the cold darkmatter. As long as the T-parity can be violated, the heavy photon can decayinto regular standard model particles and would affect the dark matterabundance in the universe, we discuss the constraint on the T-parity violationparameter based on the present data. Direct detection prospects are alsodiscussed in some detail.

Restudy on Dark Matter Time-Evolution in the Littlest Higgs model with T-parity