D
Diddi
Guest
If space/time began at the Big Bang, then a “before” is not possible?
You started your statement with an “If”. That gives two possibilities, if time did start at the Big Bang then the universe is eternal - there is no time at which the universe does not exist. If time did not start at the Big Bang then we can develop theories about what happened before it. The OP refers to just one such effort.
if time did start at the big bang, that does not make the universe eternal, it means that time itself is not eternal, as in ‘always existing’ so the universe by the same token, could not be always existing and therefore not eternal. the idea of ‘eternal’ is not linked to a time continuum.
How do you define “always existing” in the absence of time? If there is no time when the universe did not exist then the universe is eternal since the universe exists for all time. At every possible time from the beginning of time onwards, the universe exists.
from the definition of ‘eternal’ i just gave. always existing. time is a dimension of this universe interior to this system as far as we know
time didnt start until the expansion did, thus it would seem time is interior to this system. its a good measuring stick in here but it would be senseless elsewhere.time would seem to be contingent on the universe, not the other way around
i like the word ‘infinite’, or the definition ‘always existing’
as the definition of eternal is ‘always existing’ you dont, thats why the universe cannot be eternal, it had a beginning, and it looks like it will end.
Please define “always” in the absence of time. In my definition “always” means “for every possible value of time” - the definition depends on time. So, “always existing” becomes “existing for every possible value of time”, which is true of a universe which starts at the same instant as time - at time zero. The universe exists at time zero and for all subsequent values of time. The universe is eternal.
What is non-infinite about time? The positive integers on their own form exactly the same infinity as the positive and negative integers combined. Elementary Cantor set theory tells us that.Hence my point about using time-dependent words like “eternal” outside time. You cannot use a word where its definition does not apply. To use your own analogy, the measuring sticks you are trying to use for before the Big Bang are not valid there.
Please specify a value of time at which the universe did not exist. If the universe exists for all of time then that universe is eternal in my book.
The Big Bang Theory was first hinted at by mathematician Alexander Friedman in 1922 and first proposed by a Catholic priest, Monsignor Georges Henri Joseph Édouard Lemaître in 1927. Both based their calculations on Einstein’s equations of the General Theory of Relativity and both were ridiculed by secular scientists, including Einstein, who believed in a static universe. Friedman and Lemaître were both quasi-outsiders to the main physics camp which, of course, led to “who are you to dare propose a theory” condescension. When Edwin Hubble (a member of the inside camp) published his velocity-distance relation now known as “Hubble’s Law” in 1929, Lemaître (who had already derived the law in his paper) was given a discrete honorary membership in the inside club and allowed to work with the big boys. Friedman died in 1925.
The argument on this thread seems to be mostly a question of semantics. You both choose the definitions of “infinite” and “time” and “eternal” and “always” that will support your conclusion and this gets us nowhere. There are three possibilities as far as Catholics need be concerned: it all started with the Big Bang and God did it; there was a prior condition that led to the Big Bang and God did it; the Big Bang is an error of perspective and something else happened, and God did it. I vote for the third possibility myself. Errors of perspective are the “red herrings” of empirical science and the temporally symmetrical red shift that has led to the Big Bang Theory has all the makings of one. See the following for another nail in what may be the Big Bang coffin: eprintweb.org/S/article/astro-ph/0809.3734
The complete article is available with a Google search as a download.
And, from a Thomist position, you are all guilty of the Cosmogonical Fallacy. See the following:
guweb2.gonzaga.edu/faculty/calhoun/socratic/Tkacz_AquinasvsID.html
An expanded version of this article is available in the November issue of This Rock magazine.