madner wrote:Stephen Hawking uses the term "imaginary time" in his book "A
Brief History of Time". First of all, this is NOT a reference to some
physical quantity different from "real" time, but another way of handling
"real" time mathematically. As Hawking says on page 135, "...we may regard
our use of imaginary time and Euclidean space-time as merely a mathematical
device (or trick) to calculate answers about real space-time." There is an
important quantity given by ds^2 = dx^2 + dy^2 + dz^2 - (c^2)*dt^2 where "^2"
means "squared"; c is the speed of light; dx, dy, and dz are klix changes in
the three spatial directions; and ds is the resultant change in a sort of 4-
dimensional "length". Suppose we define a new variable w by w=i*c*t where i
is the square root of -1 (i is an example of an "imaginary" number. Then we
get ds^2 = dx^2 + dy^2 + dz^2 + dw^2. Now, all four terms have the same form,
and w (like x,y, and z) has units of length. One may think of w as "imaginary
time", but the only thing that has changed is the mathematical form, not the
underlying physics.
Tolko o imaginarnom vremenu.
Koristio si bozansku cesticu, ali ne u kontekstu bozona nego
Now Stephen Hawking's theory dissolves any worries about how the universe could begin to exist uncaused. He supposes that there is a timeless space, a four-dimensional hypersphere, near the beginning of the universe. It is smaller than the nucleus of an atom. It is smaller than 10^-33 centimeters in radius. Since it was timeless, it no more needs a cause than the timeless god of theism. This timeless hypersphere is connected to our expanding universe. Our universe begins smaller than an atom and explodes in a Big Bang and here we are today in a universe that is still expanding. Is it nonetheless possible that God could have caused this universe? No. For the wave function of the universe implies there is a 95% probability that the universe came into existence uncaused. If God created the universe, he would contradict this scientific law in two ways. First, the scientific law says that the universe would come into existence because of its natural, mathematical properties, not because of any supernatural forces. Second, the scientific law says the probability is only 95% that the universe would come into existence. But if God created the universe, the probability would be 100% that it would come into existence because God is all-powerful. If God wills the universe to come into existence, his will is guaranteed to be 100% effective.
Dakle to je nesto sasvim drugo od onoga sto si sam tvrdio.
Ne, pogledaj bolje. Pa nema potrebe da me uvjeravaš, a cijelu sam knjigu pročitao

. Ja sam naveo samo da Hawking u kontekstu nastanka svemira, u kontekstu njegove teorije o oduvijek vremenu treba bozon radi reakcije i početka, jer bozon komunicira i omogućava interakciju između ostalih čestica. Ne bih se složio sa apologetama koje objašnjavaju Hawkingove stavove, hajmo ga pustiti da sam to uradi:
"Stvari još teže stoje sa
matematičkom predstavom o imaginarnom vremenu, u vezi sa kojom smo Džim Hartl i ja izložili zamisao o tome da Vaseljena nema ni početak ni kraj. Jedan filosof nauke žestoko me je napao zbog ovog uvođenja imaginarnog vremena. On je kazao: 'Kako jedan matematički trik kakvo je imaginarno vreme može da ima bilo kakve veze sa stvarnom Vaseljenom?' Mislim da je filosof pobrkao tehničke matematičke pojmove kao što su stvarni i imaginarni brojevi sa načinom na koji se 'stvarno' i 'imaginarno' koriste u svakodnevnom govoru. Ovo samo osnažuje moje stanovište: kako možemo znati šta je stvarno, nezavisno od teorije ili modela kojima ga tumačimo?"
Dakle, sam Hawking navodi da je imaginarno vrijeme posebna odrednica u odnosu na stvarno (u engleskom jeste real), tre da zahtijeva matematičku predodžbu. Po validnoj fizici i matematici, kako si ti naveo u jednom od prethodnih postova, vrijeme (stvarno vrijeme) nastaje Velikim praskom, prije toga ga nije bilo, tako da imaginarno vrijeme opisuje njegov Univerzum koji bitiše na nivou polovine vala oduvijek - pročitaj ono što je on rekao, što je otvoreno rekao i u intervjuima, i pusti apologete koji žele zadržati njegovu teoriju, ali sa malim izmjenama u "razumijevanju".