kukacos#31
Elolvastam, de attól még butaság marad. Miért kéne szuperlumináris tágulás ahhoz, hogy a fény tetszőlegesen lassan érjen ide távoli objektumoktól?
Inflation is sometimes described as “superluminal expansion”. This is misleading because it implies that non-inflationary expansion is not superluminal. However, any expansion described by Hubble’s law has superluminal recession velocities for sufficiently distant objects. Even during inflation, objects within the Hubble sphere (D < c/H) recede at less than the speed of light, while objects beyond the Hubble sphere (D > c/H) recede faster than the speed of light. This is identical to the situation during non-inflationary expansion, except the Hubble constant during inflation was much larger than subsequent values.
Történetesen úgy tartják, hogy a megfigyelhető Univerzum mérete jelenleg 46.5 milliárd fényév. Ez nem áll ellentmondásban azzal, hogy csak 13.1 milliárd éves.
http://en.wikipedia.org/wiki/Observable_universe
While it is commonly understood that nothing travels faster than light, it is a common misconception that the radius of the observable universe must therefore amount to only 13.7 billion light-years. This reasoning makes sense only if the Universe is the flat spacetime of special relativity; in the real Universe, spacetime is highly curved on cosmological scales, which means that 3-space (which is roughly flat) is expanding, as evidenced by Hubble's law. Distances obtained as the speed of light multiplied by a cosmological time interval have no direct physical significance.