I tend towards believing that there almost certainly is infinity existing, due to both the universe being flat and inflation having fairly good observational evidence.
I used to think along these lines, but I no longer think it makes sense to extrapolate this way. When I say a surface (e.g. of a table) is flat, I do not mean it is perfectly flat in a geometrical sense, just that its curvature is sufficiently small for me to call it flat in everyday language.
Similarly, when physicists claim the universe is flat, they just mean there is a very low likelihood that (the absolute value of) its curvature is higher than a very small value. However, that upper bound for the curvature is still infinitely larger than 0. In this sense we have zero evidence about the universe being exactly flat. The density parameter (see here) being Omega = 1 + VS = 1 + 10^-10^10^10^10^10^10^10^10^10 satisfies our data exactly as well as Omega = 1.
Hi Sharmake,
I used to think along these lines, but I no longer think it makes sense to extrapolate this way. When I say a surface (e.g. of a table) is flat, I do not mean it is perfectly flat in a geometrical sense, just that its curvature is sufficiently small for me to call it flat in everyday language.
Similarly, when physicists claim the universe is flat, they just mean there is a very low likelihood that (the absolute value of) its curvature is higher than a very small value. However, that upper bound for the curvature is still infinitely larger than 0. In this sense we have zero evidence about the universe being exactly flat. The density parameter (see here) being Omega = 1 + VS = 1 + 10^-10^10^10^10^10^10^10^10^10 satisfies our data exactly as well as Omega = 1.