Showing items with similar title or keywords.

• Cosmic perturbation theory and inflation 

  Hämäläinen, Antti (2015)

  Tässä pro gradu -tutkielmassa olen käynyt läpi yhden skalaarikentän synnyttämän kosmisen inflaation teoriaa. Tätä varten olen opiskellut kosmista häiriöteoriaa joka tutkii Friedmann-Robertson-Walker -avaruusajan ympärille ...

• Axion cosmology 

  Leskinen, Juuso (2016)

  Tässä pro gradu -tutkielmassa tarkastellaan hiukkasfysiikan standardimallin U(1)_PQ-laajennukseen kuuluvan uuden skalaarikentän, aksionin, roolia kosmologiassa. Aluksi esittelemme valittuja paloja kosmologian standardimallista, ...

• Can QCD axion stars explain Subaru HSC microlensing? 

  Schiappacasse, Enrico D.; Yanagida, Tsutomu T. (American Physical Society (APS), 2021)

  A non-negligible fraction of the QCD axion dark matter may form gravitationally bound Bose Einstein condensates, which are commonly known as axion stars or axion clumps. Such astrophysical objects have been recently proposed ...

• Electroweak baryogenesis at high bubble wall velocities 

  Cline, James M.; Kainulainen, Kimmo (American Physical Society, 2020)

  It is widely believed that electroweak baryogenesis should be suppressed in strong phase transitions with fast-moving bubble walls, but this effect has never been quantitatively studied. We rederive fluid equations describing ...

• Systematic moment expansion for electroweak baryogenesis 

  Kainulainen, Kimmo; Venkatesan, Niyati (IOP Publishing, 2024)

  We present a systematic moment expansion for solving the semiclassical Boltzmann equations for electroweak baryogenesis. The expansion is developed in powers of adiabatic coordinate velocity, and it is used for computing ...