In this project we study chameleon theories in cosmic voids. We investigate the field profile of the chameleon field as well as the fifth force in voids by numerically solving the equations of motion for chameleon fields. The possibility of an analytical approximation for voids is also studied, the well known thin and thick-shell regimes are studied and both are deemed unsuitable for use in cosmic voids. We develop an alternative approximation which is tested against the numerically solved field profile. The agreement between the numerical solution and the analytical approximation is generally poor and the disagreement is likely due in part to the fact that the chameleon field doesn't reach it's equilibrium value inside the void.
| Identifer | oai:union.ndltd.org:UPSALLA1/oai:DiVA.org:uu-413675 |
| Date | January 2020 |
| Creators | Schildt, Erik |
| Publisher | Uppsala universitet, Teoretisk astrofysik |
| Source Sets | DiVA Archive at Upsalla University |
| Language | English |
| Detected Language | English |
| Type | Student thesis, info:eu-repo/semantics/bachelorThesis, text |
| Format | application/pdf |
| Rights | info:eu-repo/semantics/openAccess |
| Relation | FYSAST ; FYSPROJ1170 |
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