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Previous works show significant effects of dark matter on low mass main sequence stars. Assuming stars were born without dark matter, stars need to capture dark matter from the environment. Therefore, it is important to learn detailed mechanism of dark matter capture by stars. The calculation on how...
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| Format: | Theses |
| Language: | Indonesia |
| Online Access: | https://digilib.itb.ac.id/gdl/view/20555 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | Previous works show significant effects of dark matter on low mass main sequence stars. Assuming stars were born without dark matter, stars need to capture dark matter from the environment. Therefore, it is important to learn detailed mechanism of dark matter capture by stars. The calculation on how spherical bodies capture dark matter has been carried out since 1980s. This <br />
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thesis is aimed to study dark matter capture by stars, especially neutron stars. Why neutron stars? <br />
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Observations find many supernovae remnants near the Galactic centre, which which might have been formed by the explosion of high mass stars at the final stage of their evolution. These explosions could end up leaving neutron stars or blackholes. Until today, neutron star interior is better known than blackhole interior. N-body simulations suggest high ambient density of dark <br />
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matter near the Galactic centre. Based on those, we argue that many neutron stars reside region close to the Galactic centre and can accrete a considerable number of dark matter, which may then be able to give effect on neutron stars interior. We trace particles' orbits around the star and select which particles can be trapped inside the star. We take stellar density model into account and compare it to the calculation assuming uniform stellar density. Involving stellar density model in the calculation appears to increase the fraction of captured dark matter by stars. Preliminary study on how stellar rotation affect phase space of dark matter capture is also presented in this work. The area of phase space parameter J (angular momentum) seems pretty complicated in this case, so that further concern is necessary in rigorous calculation of dark matter capture by rotating stars. |
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