Daily Study Log (2019-02-13)

Research Mass-Radius Relation of Neutron Stars I have been reading the paper that my advisor recommended. I can understand the concept of the test after reading this. Maybe I can read it up and write a test code tomorrow. Study Astronomy & Astrophysics I have read the AAS Nova article. I have read the two…

Daily Study Log (2019-02-12)

 Research Mass-Radius Relation of Neutron Stars I have been reading the paper in order to check whether my code (TOV solver) follows the equation of state (EOS): Units in the EOS are used the geometrized( ) units, so I need to convert it into cgs units: I easily put this calculation in my TOV solver,…

Daily Study Log (2019-02-11)

Research Mass-Radius Relation of Neutron Stars I need to figure out why 1% of the difference occurs between the TOV solvers and RNS code. To do this, I’m studying another simple analytic solution in previous papers. Study Astronomy & Astrophysics I have read the AAS Nova article. English I have read the front page of…

Daily Study Log (2019-02-10)

Research Mass-Radius Relation of Neutron Stars I did a convergence study for three different codes (RNS v 2.0, my TOV solver, and my advisor’s TOV solver) to see they are converging to the same value. It is highly recommended that the results should be visualized for comparison. So I wrote a Python code for a…

Daily Study Log (2019-02-09)

Study English I have added 22 sentences, 1 TOEFL essay, and 1 GRE essay. I have studied 39 words, 28 sentences, 3 TOEFL essays, and 3 GRE essays using Anki. Math I have solved 6 GRE Quantitative problems. Physics I have solved 6 Physics GRE problems. I have updated 2 Physics GRE solutions in this…

Daily Study Log (2019-02-08)

Research Mass-Radius Relation of Neutron Stars I learned something important in dealing with numerical calculations. Whenever I do simulations, I should always do a convergence study to see how the grid resolution affects your results. I should try decreasing the radial grid cell size to see if the codes are converging to the same value. Study…

Daily Study Log (2019-02-07)

Research Mass-Radius Relation of Neutron Stars I have tested the RNS v2.0 code for the cases of two central mass densities, and , respectively. I have compared these results with my TOV solver’s results, and my advisor’s sample code results. They are similar but not the same. Study Astronomy & Astrophysics I have read the AAS…

Daily Study Log (2019-02-06)

Research Mass-Radius Relation of Neutron Stars I have tested the validity of the RNS v2.0 code for () polytropic case with the central mass density is . It turned out to be a good agreement with the Lane-Emden solution. Study English I have studied 29 words, 25 sentences, and 2 TOEFL essays using Anki. General…

Daily Study Log (2019-02-05)

Research Mass-Radius Relation of Neutron Stars I got the relation between the central energy density and central mass density. In the polytropic n = 1 () case, Using this relation, I put the central mass density into my TOV solver and compare with RNS result. The results are slightly different. Now I have to find…

Daily Study Log (2019-02-04)

Research Mass-Radius Relation of Neutron Stars I was having trouble with converting units from geometrical units to cgs units. But I found relations between them from the paper. But I need to separate central mass density from a central ‘energy’ density. I understood that they are definitely different, but I have to find a relation…