2019 Fiscal Year Research-status Report
Can Baryon-Dark Matter Streaming Motion Explain Supermassive Blackholes in the Early Universe?
| Project/Area Number |
19K23455
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| Research Institution | The University of Tokyo |
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Principal Investigator |
Park Hyunbae 東京大学, カブリ数物連携宇宙研究機構, 特任研究員 (40842985)
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| Project Period (FY) |
2019-08-30 – 2021-03-31
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| Keywords | Cosmology / Numerical simulation / Reionization / First stars / Blackholes |
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| Outline of Annual Research Achievements |
We have finished developing our initial condition (IC) generator for cosmological structure formation simulations. Our IC generator can add the effect of baryon-dark matter streaming velocity and local overdensity, which are the main parameters of our interest in the study. We have created a number of ICs for several levels of streaming velocity and overdensity and evolved them using hydrodynamics simulations to study structure formation.
Recently, we submitted a paper from our early results and the manuscript is currently under review. The paper is titled as "FIRST STRUCTURE FORMATION UNDER THE INFLUENCE OF GAS-DARK MATTER STREAMING VELOCITY AND DENSITY: IMPACT OF THE BARYONS-TRACE-DARK MATTER APPROXIMATION" and it contributes to the methodology of simulating structure formation in the presence of the streaming velocity. In this work, we mostly focused on the properies of gas cloud that will either form the first stars of first blackholes.
For the next step, we are now simulating the collapse of gas clould in to bound objects. Our direct goal is to determine what combinations of streaming velocity and local overdensity results in direct collapse blackholes instead of stars. Then, we shall predict how many gravitational wave sources we will see from future surveys based on our models of blackhole formation.
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| Current Status of Research Progress |
Current Status of Research Progress
1: Research has progressed more than it was originally planned.
Reason
Our orignal goal for the fiscal year 2019 was to prepare the initial conditions for our main simulations. But, we already finished producing the initial conditions and running some our planned simulations for the fiscal year 2020. Also, we obtained enough results to produce an extra paper on the methodology, which was not originally planned. If we finish our main simulations and the result paper, we would have achieved more than we initial anticipated.
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| Strategy for Future Research Activity |
We will continue running our blackhole formation and produce a paper. Also, we obtained insights for our future projects. If the streaming velocity helps producing blackholes, the X-ray emission from those blackholes can correlate with the streaming velocity. We are going to investigate this possibily after finishing our proposed work.
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