tag:blogger.com,1999:blog-34480619.post8227313014417784678..comments2024-03-11T13:47:03.621-05:00Comments on Physics and Physicists: A Universe From NothingZapperZhttp://www.blogger.com/profile/15861398273820851809noreply@blogger.comBlogger3125tag:blogger.com,1999:blog-34480619.post-21539992021644800662015-06-04T23:58:07.028-05:002015-06-04T23:58:07.028-05:00When scientists say that the universe can simply c...When scientists say that the universe can simply come out of nothing without any divine intervention, they think of the universe in terms of its energy content only. In the book ‘The Grand Design’, page 281, scientist Stephen Hawking has written that bodies like stars or black holes cannot just appear out of nothing, but a whole universe can. What Hawking meant to say here was this: As the total energy of a whole universe is zero, so it can come out of nothing. But stars or black holes will fail to do so, because their total energy is not zero. But universe means not only its energy universe means its space-time as well. Do these scientists think that the total space-time of the universe is zero, and therefore, the entire space-time of the universe can also appear out of nothing? uchitrakarhttps://www.blogger.com/profile/09317803821391979129noreply@blogger.comtag:blogger.com,1999:blog-34480619.post-39332776756280743302012-01-10T12:44:53.417-06:002012-01-10T12:44:53.417-06:00Looking forward to it, thanks for the heads up. is...Looking forward to it, thanks for the heads up. is it out in Europe yet, do you know? CormacProfessor Rhttps://www.blogger.com/profile/08227006868149583276noreply@blogger.comtag:blogger.com,1999:blog-34480619.post-85030302153705659012012-01-09T14:38:08.033-06:002012-01-09T14:38:08.033-06:00I haven't yet read Krauss' book, but I'...I haven't yet read Krauss' book, but I've seen a presentation by him, and I have a slightly different take that is compatible with textbook cosmology. I think we need to recognize the counter-intuitive fact that time is finite. Although we intuitively believe that time must be infinite, and thus there must be some time before the big bang, this is not what the evidence says. Consider these two claims:<br /><br />* The universe is 13.7 billion years old.<br />* The universe has always existed.<br /><br />Both of these claims are true. It might seem that the second claim contradicts the first, but it doesn't if you recognize that time is finite. Since the universe has existed for all time, the universe has always existed. Therefore trying to explain how the universe has "come from nothing," which seems to imply a time before the big gang, is already to misunderstand the nature of time.<br /><br />(If I have misunderstood Krauss' position, please correct me.)Ryan Dickherberhttps://www.blogger.com/profile/02290543447535851304noreply@blogger.com