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Dynamics of black holes in dense ste...

Chatterjee, Pinaki.

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Dynamics of black holes in dense stellar systems.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Dynamics of black holes in dense stellar systems./
作者:	Chatterjee, Pinaki.
面頁冊數:	99 p.
附註:	Source: Dissertation Abstracts International, Volume: 65-01, Section: B, page: 0254.
Contained By:	Dissertation Abstracts International65-01B.
標題:	Physics, Astronomy and Astrophysics. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3117974
ISBN:	0496653989

Dynamics of black holes in dense stellar systems.
Chatterjee, Pinaki.

Dynamics of black holes in dense stellar systems. - 99 p.

Source: Dissertation Abstracts International, Volume: 65-01, Section: B, page: 0254.

Thesis (Ph.D.)--Harvard University, 2004.

We develop physical models to describe the dynamics of N black holes inside dense stellar systems. For N = 1, we show that the force on a single massive black hole consists of two independent parts: the slowly varying influence of the aggregate stellar system, and a rapidly fluctuating stochastic force arising from discrete encounters with individual stars. Detailed properties of the resulting Brownian wandering of the black hole are calculated, and it is shown that in equilibrium, the position and velocity of the black hole are distributed as independent Gaussians. The results are applied to derive a lower limit on the mass of the black hole Sgr A* at the center of our Galaxy. We also consider whether in the stationary state the black hole achieves a state of equipartition of kinetic energy with the surrounding stars, and show that in certain cases, deviation from equipartition can be large.

ISBN: 0496653989Subjects--Topical Terms:

1019521
Physics, Astronomy and Astrophysics.

Dynamics of black holes in dense stellar systems.
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500 $a Source: Dissertation Abstracts International, Volume: 65-01, Section: B, page: 0254.
500 $a Advisers: Lars Hernquist; Abraham Loeb.
502 $a Thesis (Ph.D.)--Harvard University, 2004.
520 $a We develop physical models to describe the dynamics of N black holes inside dense stellar systems. For N = 1, we show that the force on a single massive black hole consists of two independent parts: the slowly varying influence of the aggregate stellar system, and a rapidly fluctuating stochastic force arising from discrete encounters with individual stars. Detailed properties of the resulting Brownian wandering of the black hole are calculated, and it is shown that in equilibrium, the position and velocity of the black hole are distributed as independent Gaussians. The results are applied to derive a lower limit on the mass of the black hole Sgr A* at the center of our Galaxy. We also consider whether in the stationary state the black hole achieves a state of equipartition of kinetic energy with the surrounding stars, and show that in certain cases, deviation from equipartition can be large.
520 $a For N = 2, we study the case of massive binary black holes in spherically symmetric bulges of galaxies, and investigate whether the Brownian motion of a binary's center of mass can allow its continued interaction with stellar orbits, and to keep hardening to the point of coalescence by the emission of gravitational radiation. We find that a considerable fraction of binaries in galaxies can by this means coalesce within a Hubble time. The predictions of the above models are confirmed by N-body simulations.
520 $a We examine the interactions of N &Gt; 2 stellar-mass black holes in globular clusters with a population of primordial stellar binaries. We find that close encounters between them result in the rapid exchange of the stellar members of the binaries with black holes. Repeated encounters between the black hole binaries and single black holes then result in the ejection of almost all the black holes from the cluster in a fraction of the age of the Universe. This may explain why no accreting black holes in X-ray binaries have been seen in globular clusters.
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