Analiza inertnega dubletnega modela in preostale gostote temne snovi

Pezer, Mario (avtor), Nemevšek, Miha (mentor)

Temna snov je ena od večjih ugank moderne fizike. Astronomski podatki nakazujejo na obstoj nečesar, kar gravitacijsko vpliva na objekte in svetlobo v vesolju. Kljub obstoječim alternativnih teorijam, ki ta vpliv razlagajo drugače - npr. modificirana gravitacija, stojijo teorije z dejansko snovjo kot tiste, ki so najmanj ovržene in najbolj obetavne, hkrati pa najštevilčnejše. V magistrski nalogi se preučuje ena mogoča realizacija temne snovi, in sicer v obliki šibko interagirajočega masivnega delca, kopiji Higgsa. Taka izbira je naravna, saj se zgledujemo po že znanem in dokazanem delcu. Imenuje se inertni dubletni model (IDM), po glavni lastnosti temne snovi, da je nereaktivna. Cilj je prikazati alternativen način za izračun termalno povprečenega preseka in posredno tudi zamrznitvene vrednosti preostale gostote temne snovi v vesolju, po tem ko se vesolje dovolj ohladi in razširi, da le-ta ne reagira in anihilira več. Preuči se večje prispevke k termalno povprečenem preseku in nakaže, na kakšen način so izračunljivi v tej metodi.

• Jezik: Slovenski jezik
• Ključne besede: temna snov, inertni dubletni model, preostala gostota, termalno povprečen sipalni presek
• Vrsta gradiva: Magistrsko delo/naloga
• Tipologija: 2.09 - Magistrsko delo
• Organizacija: FMF - Fakulteta za matematiko in fiziko
• Leto izida: 2024
• PID: 20.500.12556/RUL-161886
• COBISS.SI-ID: 207888387
• Datum objave v RUL: 15.09.2024

PEZER, Mario, 2024, Analiza inertnega dubletnega modela in preostale gostote temne snovi [na spletu]. Magistrsko delo. [Dostopano 7 april 2025]. Pridobljeno s: https://repozitorij.uni-lj.si/IzpisGradiva.php?lang=slv&id=161886

Sekundarni jezik

• Jezik: Angleški jezik
• Naslov: Analysis of the inert doublet model and relic density of dark matter

Izvleček

Dark matter is one of the bigger mysteries of modern physics. Astronomical data shows that objects and light in space experience additional gravitational effects from something unseen. Though there exist alternative theories for this effect, such as modified gravity, those that propose actual new matter are the least refuted, most popular and most promising. In this masters work, I study one such realization of dark matter, in the form of a weakly interacting massive particle, a copy of the Higgs. This is a natural choice, as we are taking example after a known and proven particle. The realization is called the inert doublet model (IDM), after its primary characteristic - its low reactivity. The goal is to provide an alternative method of calculating the thermally averaged cross-section and consequently also the freezeout relic density of dark matter after the universe cools and expands, such that the dark matter does not react further. The main contributions to the cross-section are analyzed and it is shown how we can apply them.

• Ključne besede: dark matter, inert doublet model, relic density, thermally averaged cross section