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Sabine Hossenfelder: Backreaction: Dark matter nightmare: What if we are just using the wrong equations?


#science #cosmology #gravity
  • Needless to say, taking an average on one side of the equation requires that you also take an average on the other side. But since the gravitational part is non-linear, this will not give you the same equations that we use for the solar system: The average of a function of a variable is not the same as the function of the average of the variable. We know it’s not. But whenever we use general relativity on large scales, we assume that this is the case.*
http://backreaction.blogspot.com/2019/10/dark-matter-nightmare-what-if-we-just.html
 

Sabine Hossenfelder: Backreaction: Dark matter nightmare: What if we are just using the wrong equations?


#science #cosmology #gravity
  • Needless to say, taking an average on one side of the equation requires that you also take an average on the other side. But since the gravitational part is non-linear, this will not give you the same equations that we use for the solar system: The average of a function of a variable is not the same as the function of the average of the variable. We know it’s not. But whenever we use general relativity on large scales, we assume that this is the case.*
http://backreaction.blogspot.com/2019/10/dark-matter-nightmare-what-if-we-just.html
 

It's Official: Astronomers Just Unveiled The First-Ever Direct Image of a Black Hole


Very COOL! But I'm underwhelmed. Artists' views are ever-so-much better. :)

https://giant.gfycat.com/ZestyRawIvorybilledwoodpecker.webm

#physics #black holes #astrophysics #astronomy #cosmology #Einstein #Hawking
 

It's Official: Astronomers Just Unveiled The First-Ever Direct Image of a Black Hole


Very COOL! But I'm underwhelmed. Artists' views are ever-so-much better. :)

https://giant.gfycat.com/ZestyRawIvorybilledwoodpecker.webm

#physics #black holes #astrophysics #astronomy #cosmology #Einstein #Hawking
 
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