projectideas
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| ==== Project Ideas ==== | ==== Project Ideas ==== | ||
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| + | == Neutrino Driven Wind == | ||
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| + | - By doing a literature search, determine three different types of neutrino spectra that are appropriate for neutrino driven wind conditions. Alter the reaction network to include neutrino interactions on free nucleons. Calculate an abundance pattern for a neutrino driven wind model with the three different types of spectra. Analyze the results and discuss what characteristics of the spectra lead to different outcomes. | ||
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| + | == Neutron Star Merger r-process == | ||
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| + | - Determine, using the literature, representative conditions for tidal ejection of material from neutron star mergers and for neutrino driven winds. Calculate, using the reaction network, abundance patterns for each and compare the results. Discuss why the patterns look different. | ||
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| + | == BBN: == | ||
| + | |||
| + | * Quantify the sensitivities of the light elements to variations in the key reaction rates. Propagate uncertainties in nuclear reation rates via Monte Carlo to evaluate the uncertainties in the BBN predictions. | ||
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| + | * Explore the consequences of new physics during BBN. This can include: adding neutrino species, modification of the gravitational constant, neutrino degeneracy and neutrino oscillations. | ||
| + | * For a more challenging calculation, consider the effect of dark matter decays that dissociate 4He. | ||
| + | * For each of these, what is the effect on the light elements? | ||
| + | * How can we use light element and cosmological (e.g., CMB) observations to constrain these scenarios? | ||
| + | |||
| == Exploding a polytropic star == | == Exploding a polytropic star == | ||
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| * How do trajectories differ when the factor is: half, equal, and twice the critical explosion value? | * How do trajectories differ when the factor is: half, equal, and twice the critical explosion value? | ||
| * Do all trajectories escape? | * Do all trajectories escape? | ||
| + | * How do things change with different polytropic indices? | ||
| * Assume an initial composition for all fluid elements. | * Assume an initial composition for all fluid elements. | ||
| * How does the composition in each trajectory evolve? | * How does the composition in each trajectory evolve? | ||
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| - | == BBN: == | ||
| - | |||
| - | * Quantify the sensitivities of the light elements to variations in the key reaction rates. Propagate uncertainties in nuclear reation rates via Monte Carlo to evaluate the uncertainties in the BBN predictions. | ||
| - | |||
| - | * Explore the consequences of new physics during BBN. This can include: adding neutrino species, modificiation of the gravitational constant, and neutrino degeneracy. For a more challenging calculation, consider the effect of dark matter decays that dissociate 4He. For each of these, what is the effect on the light elements? How can we use light element and cosmological (e.g., CMB) observations to constrain these scenarios? | ||
projectideas.txt ยท Last modified: 2014/06/06 13:39 by cyburt
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