Status Updates From Los tres primeros minutos d...

Retomando este libro que lo deje aparcado a la mitad.

... And always, the test of any theoretical preconception is in where it leads. The standard model of the early universe has scored some successes, and it provides a coherent theoretical framework for future experimental programs. This does not mean that it is true, but it does mean that it deserves to be taken seriously."

"In following this account of the first three minutes, the reader may feel that he can detect a note of scientific overconfidence. He might be right. However, I do not believe that scientific progress is always best advanced by keeping an altogether open mind. It is often necessary to forget one's doubts and to follow the consequences of one's assumptions wherever they may lead –

"The occurrence in cosmology of a pure number as small as 10^-9 has led some theorists to suppose that it is really zero (equal amounts of matter and antimatter)" Then before T = 10^13 Kelvin (the threshold temperature for protons and neutrons) there was a segregation of the universe into different domains. ..."

Excellent, as always with Weinberg. He's also very honest with what is known and what is just speculative .

"This is not to say that we actually understand how galaxies are formed. The theory of the formation of galaxies is one of the great outstanding problems of astrophysics, a problem that today seems far from solution."

The earliest supernova detected in a galaxy NOT the Milky Way was in 1885 in the Andromeda Galaxy.

So far so good. Although he makes one small error. He says "electrons, positrons, neutrinos and photons were continually being created out of pure energy." He knows better. There's no such thing as pure energy. There are only particles (electrons, etc.) and *they* have energy.