David Terr's Website

 

Publications

“Fibonacci Expansions and ‘F-adic’ integers,” The Fibonacci Quarterly, v. 34, 1996

“On the Sums of Digits of Fibonacci Numbers,” The Fibonacci Quarterly, v. 35, 1996..

A Modification of Shanks’ Baby-Step Giant-Step Algorithm,” Mathematics of Computation, v. 69, 2000

Here's a copy of my resume

History of the Universe

According to data collected from NASA's Wilkinson Microwave Anisotropy Probe (WMAP) in 2003, the universe is approximately 13.7 billion years old. The history of the universe may be divided into eras in which different physical processes were taking place. During missing periods below, nothing much interesting occurred except expansion and cooling.

< 10^-43 seconds (Planck Era)
The known laws of physics break down so nothing is known about this era. The Big Bang occured at the end of this era.

10^-43 seconds
Gravity separated from the other three forces (strong, weak, and electromagnetic), which remained unified and the universe began to expand.

10^-35 to 10^-32 seconds
The universe underwent a fantastically fast expansion known as inflation, in which its size increased by a factor of 10^50 or so. Inflation ended when the strong force separated from the electroweak force, due to symmetry breaking.

10^-32 to 10^-11 seconds
The universe continued to expand and cool down, but much more slowly. By the end of this era, the electomagnetic and weak forces became separate.

10^-6 seconds
Free quarks combined and formed hadrons (baryons and mesons), including protons and neutrons.

1 second - 3 minutes
Nucleosynthesis occurred, i.e. protons and neutrons combined to form simple nuclei, including deuterium, helium, and lithium. Neutron decay occurred during this era, determining the cosmological ratio of hydrogen to helium (73% hydrogen by mass).

380,000 years
The temperature of the universe fell to about 3000K, allowing the formation of atoms. This made the universe transparent and dominated by matter. The primordial Big Bang radiation discovered by Penzias and Wilson in 1965, which has since cooled down to 3K, comes from this era.

300 million years
The first stars and galaxies formed as gravity amplified the density irregulary of the primordial gas.