Sökning: "dark energy"

Visar resultat 21 - 25 av 160 avhandlingar innehållade orden dark energy.

1. 21. Search for Dark Matter and Extra Dimensions in Monojet Final States with the ATLAS Experiment

   Författare :Olof Lundberg; Christophe Clement; Chad Finley; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Dark Matter; LHC; ATLAS; Extra Dimension; Gravity; Calorimeter; High Energy Physics; högenergifysik;

   Sammanfattning : The CERN Large Hadron Collider (LHC) is the most powerful particle ac- celerator ever built, in terms of luminosity and center-of-mass energy of the collisions. This thesis presents a search for Dark Matter and Extra Dimen- sions in the proton-proton collisions as recorded by the ATLAS detector. LÄS MER

3. 22. Studies of dark matter in and around stars

   Författare :Sofia Sivertsson; Tommy Ohlsson; Joakim Edsjö; Gianfranco Bertone; KTH; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Dark matter; particle astrophysics;

   Sammanfattning : There is by now compelling evidence that most of the matter in the Universe is in the form of dark matter, a form of matter quite different from the matter we experience in every day life. The gravitational effects of this dark matter have been observed in many different ways but its true nature is still unknown. LÄS MER

4. 23. Out of the Dark and into the Light - Microscopic Analysis of Bright, Dark and Trapped Excitons

   Författare :Maja Feierabend; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; density matrix formalism; localized states; impurities; dark excitons; strain; transition metal dichalcogenides; Bloch equations;

   Sammanfattning : Atomically thin transition metal dichalcogenides (TMDs) have been in the focus of current research due to their efficient light-matter interaction, as well as the remarkably strong Coulomb interaction that leads to tightly bound excitons. Due to their unique band structure, TMDs show a variety of optically accessible bright and inaccessible dark excitons. LÄS MER

5. 24. Inference on Dark Matter in Effective Field Theories : From XENON1T towards XENONnT: Chiral effective field theory analysis of nuclear recoils, single electrons and uncommon background modelling

   Författare :Vasile Cristian Antochi; Jan Conrad; Björn Penning; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Dark Matter; Direct Detection; Effective Field Theory; Chiral Effective Field Theory; Physics; fysik;

   Sammanfattning : Cosmological and astronomical observations show that most of the matter in the Universe is dark. This dissertation provides an overview of the dark matter evidence, and focuses on the particle dark matter hypothesis, describing possible particle candidates, concentrating on the Weakly Interactive Massive Particles (WIMPs). LÄS MER

7. 25. Calibration of b-tagging efficiency and search for Dark Matter production in association with heavy flavour quarks with the ATLAS experiment

   Författare :Anna Shcherbakova; Sara Strandberg; Chad Finley; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; ATLAS; b-tagging; calibration; Dark Matter; simplified model; Physics; fysik; High Energy Physics;

   Sammanfattning : The Large Hadron Collider (LHC) is the most powerful and complex particle accelerator ever built. The ATLAS detector is a general-purpose particle detector at the LHC, designed to cover a wide range of physics measurements. LÄS MER