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Noise-driven evolution in stellar systems: Theory
Astrophysics · Submitted 18 Jul 2000
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim We show that this form has the features of the ``universal profile'' reported by Navarro, Frenk, & White independent of initial conditions in a companion paper.
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The abstract, sentence by sentence
We present a theory for describing the evolution of a galaxy caused by stochastic events such as weak mergers, transient spiral structure, orbiting blobs, etc. This noise excites large-scale patterns that drives the evolution of the galactic density profile. In dark-matter haloes, the repeated stochastic perturbations preferentially ring the lowest-order modes of the halo with only a very weak dependence on the details of their source. Shaped by these modes, the profile quickly takes on a nearly self-similar form. We show that this form has the features of the ``universal profile'' reported by Navarro, Frenk, & White independent of initial conditions in a companion paper. In this sense, this noise-driven process is a near-equilibrium form of violent relaxation.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | We present a theory for describing the evolution of a galaxy caused by stochastic events such as weak mergers, transient spiral structure, orbiting blobs, etc. | contribution 1.00 | 0.89 | 0.08 | asserted 0.98 |
| s1 | This noise excites large-scale patterns that drives the evolution of the galactic density profile. | result 0.47 | 0.50 | 0.23 | asserted 1.00 |
| s2 | In dark-matter haloes, the repeated stochastic perturbations preferentially ring the lowest-order modes of the halo with only a very weak dependence on the details of their source. | result 0.98 | 0.74 | 0.24 | asserted 1.00 |
| s3 | Shaped by these modes, the profile quickly takes on a nearly self-similar form. | result 0.98 | 0.68 | 0.17 | asserted 0.99 |
| s4 | We show that this form has the features of the ``universal profile'' reported by Navarro, Frenk, & White independent of initial conditions in a companion paper. | result 0.85 | 0.77 | 0.30 | asserted 1.00 |
| s5 | In this sense, this noise-driven process is a near-equilibrium form of violent relaxation. | interpretation 1.00 | 0.61 | 0.29 | asserted 0.94 |
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Original abstract
We present a theory for describing the evolution of a galaxy caused by stochastic events such as weak mergers, transient spiral structure, orbiting blobs, etc. This noise excites large-scale patterns that drives the evolution of the galactic density profile. In dark-matter haloes, the repeated stochastic perturbations preferentially ring the lowest-order modes of the halo with only a very weak dependence on the details of their source. Shaped by these modes, the profile quickly takes on a nearly self-similar form. We show that this form has the features of the ``universal profile'' reported by Navarro, Frenk, & White independent of initial conditions in a companion paper. In this sense, this noise-driven process is a near-equilibrium form of violent relaxation.
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