Gravitational Lensing Deflection angle

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SUMMARY

The discussion centers on the derivation of the deflection angle in gravitational lensing, represented by the formula α = 4GM/Rc². Participants express interest in understanding the implications of this formula and its relation to concepts such as photon dynamics and astrodynamics. A specific online resource, MathPages, is recommended for further exploration of this topic. The conversation also touches on discrepancies in astrodynamic calculations, particularly regarding stellar black holes and central pressure in the Sun.

PREREQUISITES
  • Understanding of gravitational lensing principles
  • Familiarity with the formula α = 4GM/Rc²
  • Basic knowledge of photon dynamics and rest mass
  • Awareness of astrodynamics and its calculations
NEXT STEPS
  • Research the derivation of the deflection angle in gravitational lensing
  • Explore the implications of photon dynamics in gravitational fields
  • Study discrepancies in astrodynamic calculations and their effects
  • Review resources on stellar black holes and their characteristics
USEFUL FOR

Astrophysicists, cosmologists, and students interested in gravitational lensing and its mathematical derivations.

Jrod99
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Does anyone know where I could find (online) a derivation of the deflection angle in gravitational lensing:

alpha = 4GM/Rc^2

Thank you
 
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Hi Jrod
Deflection angle by E=hf (Planck) and so: m=hf/c^2? Restmass of photons=0 but dynamical could be different? What could we ever learn more from Einstein than this? In my lecture about the nonexistance of stellar black holes I come to half of your value, but about factor two-faillures in astrodynamics a whole book could be written. (I myself have two recommended books about astrodynamics witch differ factor two in central pressure in the Sun!). Cosmical lensing is what you want to discuss about isn't it.
greatings Jm
 

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