dynamical friction and mond
Download
Skip this Video
Download Presentation
Dynamical friction and MOND

Loading in 2 Seconds...

play fullscreen
1 / 8

Dynamical friction and MOND - PowerPoint PPT Presentation


  • 82 Views
  • Uploaded on

Dynamical friction and MOND. Fernando J. Selman. The roads to dynamical friction. Binary collision approximation Chandrasekhar 1942, 1943 Chandrasekhar fluctuating force arguments Uhlenbeck and Ornstein 1930 (non stellar) Chandrasekhar and von Neumann 1943 Ahmad and Cohen (1974)

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'Dynamical friction and MOND' - dolan


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
dynamical friction and mond

Dynamical friction and MOND

Fernando J. Selman

DM vs Alternative Gravities, Edinburgh

the roads to dynamical friction
The roads to dynamical friction
  • Binary collision approximation
    • Chandrasekhar 1942, 1943
  • Chandrasekhar fluctuating force arguments
    • Uhlenbeck and Ornstein 1930 (non stellar)
    • Chandrasekhar and von Neumann 1943
    • Ahmad and Cohen (1974)
    • Kandrup (1980)
    • Bekenstein and Maoz (1992)
    • del Popolo (1996)
    • Colpi and Pallavicini (1998)
    • Nelson and Tremaine (1999)
  • Polarization cloud method
    • Marochnik (1968)
    • Kalnajs (1972)
    • Lynden-Bell and Kalnajs (1972)
    • Tremaine and Weinberg (1984)
    • Bekenstein and Zamir (1990)

DM vs Alternative Gravities, Edinburgh

the approximations
The approximations
  • Binary collisions
  • Local approximation: infinite and homogeneous system
  • Markov approximation: binary collisions of negligible duration
  • Diffusion approximation: diffusion described by a Fokker-Planck equation
  • Neglect of self-gravity of response
  • Resonances

DM vs Alternative Gravities, Edinburgh

chandrasekhar binary collisions formula
Chandrasekhar Binary Collisions Formula

DM vs Alternative Gravities, Edinburgh

statistics of the fluctuating field
Statistics of the fluctuating field

DM vs Alternative Gravities, Edinburgh

polarization cloud method
Polarization cloud method

DM vs Alternative Gravities, Edinburgh

the frictional drag formulas
The frictional drag formulas

DM vs Alternative Gravities, Edinburgh

caveat m 10 5msun v 100km s 20pc x 30pc
Caveat: M=10^5Msun, V = 100km/s, 20pc x 30pc

DM vs Alternative Gravities, Edinburgh

ad