宇宙大爆炸(Big Bang)聲音重現?!
 

本校物理系教授的傑作...別擔心,除了第一聲以外不會很操音響
事實上聽起來比較像飛機引擎聲
http://staff.washington.edu/seymour/BigBangSound_2.wav

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Sound of big bang recreated

by Julia Faye Whitehead / Contributing writer
11/05/2003


The sound of the Big Bang can be heard 13.7 billion years later, thanks to UW physics professor John Cramer.

Cramer synthesized the sound with the computing program Mathematica, which can take a mathematical equation for sound and convert it into audible sound waves. He used data that was retrieved from the NASA satellite, the Wilkinson Microwave Anisotropy Probe (WMAP).

“Basically, what I did was write a little short Mathematica program that wasn’t really very elaborate,” said Cramer. “I downloaded the data from WMAP … and ran it and produced this Big Bang sound.”

Though he synthesized the sound in mid-September, Cramer wrote an article titled “BOOMERanG and the Sound of the Big Bang” that discussed the data taken from a balloon flight in Antarctica for the January 2001 issue of Analog Science Fiction/Fact Magazine.

Cramer explained that he came across the idea of synthesizing the sound when a woman who read the article e-mailed him to ask if her 11-year-old son could use a recording of the sound for a school project about the big bang. The idea caught Cramer’s attention, and one Saturday morning in September he wrote the program to synthesize the sound.

“When I got to thinking about it, I realized that the data’s there and it wouldn’t be very hard to put together a simulation of the sound so that you could actually listen to it,” Cramer explained. “I had no idea it was going to be so popular.”

The sound developed is not a loud noise. It is made of very low frequencies that are inaudible to the human ear. Cramer described it as sounding like a plane passing close overhead. Cramer developed an approximation of the sound by shifting up the original frequencies in order for it to be heard.

http://thedaily.washington.edu/all....&-Token.Count=5