常見(jiàn)例句"For us, time exists and flows," says Rovelli. 事實(shí)上,宇宙是沒(méi)有任何外部的。Yes, says Rovelli, but there is a physical explanation for it. 可以設(shè)想一個(gè)盒子里的氣體,我們不可能跟蹤各個(gè)分子在每時(shí)每刻的位置和動(dòng)量,但是我們具有這個(gè)環(huán)境里微觀(guān)狀態(tài)的總體知識(shí)。Rovelli's approach seems tantalisingly close to surmounting that obstacle. 羅威利的做法似乎是只差一點(diǎn)就克服這一障礙了。Time can be compared with a property such as temperature, which needs atoms to exist, Rovelli explains. 羅維理解釋說(shuō),溫度的概念有賴(lài)于原子的存在,而時(shí)間和溫度這種性質(zhì)有相似之處。"One of the traditional difficulties of quantum gravity was how to make sense of a theory in which the time variable had disappeared," Rovelli says. 事實(shí)上,他們甚至不能完全肯定時(shí)間 到底是否是真的存在。Smolin and Rovelli used standard techniques to quantize the equations of general relativity and in doing so discovered Penrose's networks buried in the math. 這個(gè)名詞是由英國(guó)數(shù)學(xué)家彭若斯(RogerPenrose)于1960年代首先提出,他將其看成抽象圖形。 返回 Rovelli