May 2009
24 posts
Between Nothingness & Eternity
Top photo by dharmadhatu
Bottom: Mahavishnu Orchestra
“「緣覺乘」：聲聞是由佛的言教開悟證果的；緣覺就不一定，他比聲聞聰明，觀察宇宙一切的緣起而開悟。沒有佛出現的時候，他自己能開悟，是世間絕頂聰明的人，功夫比聲聞深。緣...”
– 佛學十四講講記 第九講 方便五乘解脫
Cosmic sound - curvature and the microwave...
Sound waves travel at the speed of sound cs. For ordinary sound waves in air, this amounts to around 300 meters per second. In contrast, for the plasma sound waves in the early universe, the speed of sound amounts to roughly 60% of the speed of light. The speed of sound tells us how fast existing density perturbations travel through space. But it also tells us how long it takes to excite specific...
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