The Inflationary Universe Essay
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1.What is the most interesting thing you have learned from this book?
Alan Guth s book takes you through the journey of his life, and his career in which he made many scientific discoveries. I especially liked the way that he maps out these discoveries because it was fun to discover along with him. Throughout Guth s life he has been putting together the pieces of a giant puzzle. The concept that I found to be most interesting was that of blackbody radiation.
This concept is used universally in many situations. It is common knowledge to physicists. An object at any temperature other that absolute zero emits a glow of electromagnetic radiation. (Pg. 64) An example of this that the author gives us is the glow of the sun or the coals in a barbecue.
If this light, emitted from hot objects is put onto a spectrum there is an increasing intensity at different wavelengths. This data can be used to analyze a variety of things. A reason why this is so important for astronomers is that it can be used to understand what makes up objects such as the sun and the stars. It has also been used in determining the velocities of distant galaxies.
The author gives us the idea of constructing a closed box and heating it. The inside of the box and the outside will have two different reactions. The outside will act normally along the spectrum. On the inside, the radiation will be emitted and absorbed, and in a very short time a steady-state situation, or equilibrium, will be established. (Pg. 65) This means that it is not giving off any radiation, it is all being absorbed.
An object that gives off no radiation will fallow an equilibrium spectrum with no lines. This information was useful in the idea that the universe today should have a background of electromagnetic radiation left over from the big bang. The blackbody radiation spectrum is the way in which that energy density varies.
2. Summarize the Author s view of an inflationary period in the early Universe.
The early universe had a very uniform distribution of matter. Inflation is the explanation for this. Guth has used the idea of inflation to conquer many questions about the universe. One being the original size of...
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