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Related Concept Videos

Detection of Black Holes01:10

Detection of Black Holes

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Although black holes were theoretically postulated in the 1920s, they remained outside the domain of observational astronomy until the 1970s.
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No object with a finite mass can travel faster than the speed of light in a vacuum. This fact has an interesting consequence in the domain of extremely high gravitational fields.
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Orders of Magnitude01:15

Orders of Magnitude

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The order of magnitude of a number is the power of 10 that most closely approximates it. Thus, the order of magnitude estimates the scale (or size) of its value. To find the order of magnitude of a number, take the base-10 logarithm of the number and round it to the nearest integer. Then the order of magnitude of the number is simply the resulting power of 10.
The order of magnitude is simply a way of rounding numbers consistently to the nearest power of 10. This makes doing rough mental math...
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Gravitational Potential Energy for Extended Objects01:07

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Consider a system comprising several point masses. The coordinates of the center of mass for this system can be expressed as the summation of the product of each mass and its position vector divided by the total mass:
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The Principle of Superposition and the Gravitational Field01:17

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The principle of superposition applies to gravitational forces of objects that are sufficiently far apart. It states that the net gravitational force on a point object is the vector sum of the gravitational forces on it due to various objects. The principle helps calculate the force by listing the individual forces and then vectorially summing them up. However, it should be noted that the principle of superposition is not always apparent. In the presence of a second force, the first force could...
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  1. Home
  3. Research Domains
  5. Physical Sciences
  7. Condensed Matter Physics
  9. Surface Properties Of Condensed Matter
  11. Universal Structure Of Dark Matter Haloes Over A Mass Range Of 20 Orders Of Magnitude.
  1. Home
  3. Research Domains
  5. Physical Sciences
  7. Condensed Matter Physics
  9. Surface Properties Of Condensed Matter
  11. Universal Structure Of Dark Matter Haloes Over A Mass Range Of 20 Orders Of Magnitude.

Related Experiment Video

Setting Limits on Supersymmetry Using Simplified Models
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Setting Limits on Supersymmetry Using Simplified Models

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Universal structure of dark matter haloes over a mass range of 20 orders of magnitude.

J Wang1,2, S Bose3, C S Frenk4

  • 1Key Laboratory for Computational Astrophysics, National Astronomical Observatories, Chinese Academy of Sciences, Beijing, China. jie.wang@nao.cas.cn.

Nature
|September 4, 2020

View abstract on PubMed

Summary
This summary is machine-generated.

Cosmological simulations reveal that dark matter haloes span a vast mass range. Their density profiles are universal, and their concentration depends on cosmology and dark matter properties.

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Area of Science:

  • Cosmology
  • Astrophysics
  • Particle Physics

Background:

  • Cosmological models predict a wide range of dark matter halo masses.
  • Previous models did not fully resolve substructures in low-mass halos.

Purpose of the Study:

  • To simulate dark matter halo formation across the full observed mass range.
  • To investigate the universality of halo density profiles and mass-concentration relations.

Main Methods:

  • A cosmological simulation with a dynamic range of 30 orders of magnitude in mass.
  • Resolution of hundreds of Earth-mass halos and rich galaxy clusters.

Main Results:

  • Halo density profiles are universal across all simulated masses.
  • A tight relationship exists between halo mass and concentration, dependent on cosmology and dark matter type.
  • Concentration is independent of environment for halos below typical galaxy mass.

    • Conclusions:

    • Dark matter halo properties are remarkably consistent across vastly different mass scales.
    • New estimates for dark matter annihilation luminosity are significantly lower than previously predicted.