dark Matter in dwarf spheroidal galaxies

Paper number

IAC-18,A7,2,9,x47968

Author

Ms. Sabrina Alam, France, International Space University (ISU)

Year

2018

Abstract

The $\Lambda$CDM model is known as the standard model of Big Bang Cosmology, where $\Lambda$CDM is the cosmological constant and CDM is ‘cold dark matter’. 
Computer simulations have been made using the $\Lambda$CDM model showing the evolution of the universe, from a short time after the big bang to now, providing an almost accurate representation on large scales. However, there are some discrepancies for small galaxies which put the $\Lambda$CDM model into question. One problem is the ‘Missing Satellite Problem’, this predicts that there should be more dwarf galaxies than actually observed. The ‘Core-Cusp problem’ where computer simulations predict a ‘cusp’ of rising dark matter density within the centre of dwarf galaxies whereas observations show a flat one. 

The problems with $\Lambda$CDM on small scales might indicate a major revision, either by modifying the properties of dark matter (such as Warm dark matter or self-interacting dark matter) or more radically such as a modification of general relativity. 
Using Python, I took analytic formulae for dark matter profiles and calculated rotation curves for dwarf galaxies. By doing this we can start investigating explanations for the discrepancies within the $\Lambda$CDM model and gain a deeper understanding into dwarf galaxies.

Abstract document

IAC-18,A7,2,9,x47968.brief.pdf

Manuscript document

IAC-18,A7,2,9,x47968.pdf (🔒 authorized access only).

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