Essays about: "Toivo Tuma Niemi"

Found 2 essays containing the words Toivo Tuma Niemi.

1. 1. When Braneworlds Collide

   University essay from Uppsala universitet/Teoretisk fysik

   Author : Toivo Tuma Niemi; [2021]
   Keywords : physics; cosmology; parallel universe; dark energy; inflation; braneworlds; D brane;

   Abstract : This project is an investigation of a cosmological model consisting of a five dimensional AdS-vacuum with a flux. By discharges in the flux, four dimensional bubbles can nucleate in the vacuum and collide with each other while expanding. Our observable universe is considered to be localized on the membrane of such a bubble. READ MORE

3. 2. Planet Engulfment: Do Stars Eat Their Own Children?

   University essay from Uppsala universitet/Teoretisk astrofysik

   Author : Toivo Tuma Niemi; [2019]
   Keywords : Planet Engulfment; Solar Twin; Planet; Star; Planetslukning; Soltvilling; Planet; Stjärna;

   Abstract : Some stars with similar properties to our sun (solar twins) have differ- ent chemical composition than the rest of the solar twins. One explanation might be planet engulfment. Therefore we did a large number of simu- lations where a disturbing star passed a sun and a planet at a distance closer than 100 AU to see how often the planet was engulfed. READ MORE