Sökning: "cosmic radiation"

Visar resultat 6 - 10 av 26 uppsatser innehållade orden cosmic radiation.

1. 6. Background Studies of the High-Intensity Baryon Extraction and Measurement (HIBEAM) Experiment at the European Spallation Source

   Master-uppsats, Lunds universitet/Partikel- och kärnfysik; Lunds universitet/Fysiska institutionen

   Författare :Blahoslav Rataj; [2021]
   Nyckelord :Physics and Astronomy;

   Sammanfattning : The High-Intensity Baryon Extraction and Measurement experiment (HIBEAM) is proposed as one of the experimental stations at the European Spallation Source (ESS). This experiment will mainly focus on the neutron into sterile neutron oscillations which violate the baryon number (B) by one unit. LÄS MER

3. 7. Primordial Gravitational Waves and ultra-light Dark Matter in a complex singlet extended Standard Model

   Kandidat-uppsats, Lunds universitet/Partikel- och kärnfysik; Lunds universitet/Teoretisk partikelfysik - Geonomgår omorganisation

   Författare :Sara Wildenor; [2021]
   Nyckelord :theoretical physics; gravitational waves; dark matter; complex singlet extended standard model; LISA; BBO; DECIGO; Physics and Astronomy;

   Sammanfattning : In this thesis, the consequences of extending the internal symmetries of the standard model with a complex singlet scalar field, are investigated in terms of dark matter phenomenology and the possibility of primordial gravitational wave detection utilizing space based laser interferometry. The scalar potential of the model is constructed with a Z2 symmetry, which allows for the retainment of a linear and a quadratic coupling parameter, as well as a stable dark matter candidate, and an additional non-zero vacuum expectation value for the real component of the scalar field. LÄS MER

4. 8. Lyman Continuum Radiation from Intermediate-Mass Black Holes : An Estimation of the Contribution of LyC Radiation from IMBHs in z~3 Galaxies

   Kandidat-uppsats, Uppsala universitet/Observationell astrofysik

   Författare :Marika Ljungberg; [2020]
   Nyckelord :intermediate-mass black holes; cosmic reionization; high-redshift galaxies;

   Sammanfattning : This thesis concerns the cosmic reionization of the intergalactic medium in the high redshift universe and, in particular, is a first approach to examine what role intermediate mass black holes (IMBHs) play in this cosmic age. Unexpectedly high values of hydrogen ionizing radiation, compared to current models, have been reported from galaxies at redshift ~3 (used as stand-ins for galaxies at the age of reionization), and thus these models need revision, potentially by adding effects of IMBH content in the galaxies. LÄS MER

5. 9. Construction of a Geiger counter : For cosmic radiation in near space conditions

   Kandidat-uppsats, Uppsala universitet/Institutionen för teknikvetenskaper

   Författare :Carl Tysk; Elvira Brenner; Anton Olsson; [2018]
   Nyckelord :;

   Sammanfattning : .... LÄS MER

7. 10. Simple cosmological models and their descriptions of the universe

   Kandidat-uppsats, Linköpings universitet/Matematik och tillämpad matematik

   Författare :Emil Gustafsson; [2018]
   Nyckelord :Tensors; General relativity; Einstein s field equations; Cosmology; Friedmann s equation; FLRW-spacetimes; Tensorer; Allmän relativitetsteori; Einsteins fältekvationer; Kosmologi; Friedmanns ekvation; FLRW-rumtider;

   Sammanfattning : Cosmology is the study of the universe as a whole, and attempts to describe the behaviour of the universe mathematically. The simplest relativistic cosmological models are derived from Einstein's field equations with the assumptions of isotropy and homogeneity. LÄS MER