Register to reply 
Eternal Inflation Time Will End 
Share this thread: 
#1
Oct110, 03:00 PM

P: 920

This paper came out last week and looks very interesting but of course relies on MTheory: http://arxiv.org/abs/1009.4698



#2
Oct110, 08:47 PM

P: 2,499

The argument the authors use is that if time is infinite, all events that are not prohibited are possible. From this observation the authors seem to conclude that if all possible events must occur and must occur an infinite number of times, then the method of assigning probabilities is "undermined." If I understand this argument correctly, it is simply wrong.
The point is easily made with the natural numbers. They are an infinite set. The set of all even numbers is also infinite; so is the set of every 10th number, every 100th number and every [tex]100^{100}[/tex] th number. Moreover each of these sets has the same cardinality. Nevertheless it is quite possible to assign the probability of a random number. We can say, for example, that numbers divisible by 100 are only one tenth as likely as those divisible by 10 when sampling from an arbitrarily large or even "infinite" set. 


#3
Oct210, 04:55 AM

P: 256

I took a glance at paper, and although it is interesting, that was my first doubt also. How come that probabillity sort of works in our world? Maybe I don't understand something. 


#4
Oct210, 05:05 AM

P: 2,499

Eternal Inflation Time Will End
EDIT: I edited the first paragraph of my original post since some of the things I said were not explicitly expressed in the paper. 


#5
Oct210, 08:06 AM

P: 499




#6
Oct210, 12:10 PM

P: 2,499




Register to reply 
Related Discussions  
Help needed with the effect of no time / time freeze on bullet movement  Introductory Physics Homework  13  
The terms length contraction and time dilation  Special & General Relativity  11  
Real time Vs. Rendered (referring to graphics)  General Discussion  3  
Chaotic Eternal Inflation vs. False Vacuum Eternal Inflation  Cosmology  1  
Alan Guth and Stephen Hawking on Eternal Inflation  Astronomy & Astrophysics  0 