Artículos con la etiqueta ‘cosmos’

Has Science Established that the Cosmos is Physically Comprehensible?

Por • 8 oct, 2012 • Category: Leyes

Abstract: Most scientists would hold that science has not established that the cosmos is physically comprehensible – i.e. such that there is some as-yet undiscovered true physical theory of everything that is unified. This is an empirically untestable thesis and thus lies beyond the scope of science. However, this argument presupposes a conception of science which holds that in science theories are accepted solely on the basis of evidence. But this conception of science is untenable. Any fundamental physical theory, in order to be accepted as a part of theoretical scientific knowledge, must be (1) sufficiently empirically successful, and (2) sufficiently unified. Given any accepted theory of physics, endlessly many empirically more successful disunified rivals can always be concocted – disunified because they assert that different dynamical laws govern the diverse phenomena to which the theory applies. These disunified rivals are not considered for a moment in physics, despite their greater empirical success. This persistent rejection of empirically more successful but disunified rival theories means, I argue, that a big, highly problematic, implicit assumption is made by science about the cosmos, to the effect, at least, that the cosmos is such that all seriously disunified theories are false.

Why Our Universe Must Have Been Born Inside a Black Hole

Por • 30 dic, 2010 • Category: Ciencia y tecnología

A small change to the theory of gravity implies that our universe inherited its arrow of time from the black hole in which it was born.

STEPHEN HAWKING: How to build a time machine

Por • 11 ago, 2010 • Category: Ciencia y tecnología

Hello. My name is Stephen Hawking. Physicist, cosmologist and something of a dreamer. Although I cannot move and I have to speak through a computer, in my mind I am free. Free to explore the universe and ask the big questions, such as: is time travel possible? Can we open a portal to the past or find a shortcut to the future? Can we ultimately use the laws of nature to become masters of time itself?