Live Issues in Classical Study. Karl Pomeroy Harrington

Classical issues in electroweak baryogenesis

In one scenario of baryogenesis, the matter-antimatter asymmetry was generated in the early universe during a cold electroweak transition. We model this transition by changing the sign of the effective mass-squared parameter of the Higgs field from positive to negative. The resulting ‘tachyonic’ instability leads to a rapid growth of occupation numbers, such that a classical approximation can b...

The Paris-Harrington Theorem

In Ramsey theory, very large numbers and fast-growing functions are more of a rule than an exception. The classical Ramsey numbers R(n,m) are known to be of exponential size: the original proof directly gives the upper bound R(n,m) ≤ ( m+n−2 n−1 ) , and an exponential lower bound is also known. For the van der Waerden numbers, the original proof produced upper bounds that were not even primitiv...

2 Leo Harrington And

1. Introduction A set A of nonnegative integers is computably enumerable (c.e.), also called recursively enumerable (r.e.), if there is a computable method to list its elements.

Pomeroy tubal ligation by laparoscopy and minilaparotomy.

Pomeroy tubal ligation is a widely-used method for surgical female sterilization. A laparoscopic technique of Pomeroy tubal ligation using endoloop sutures is compared with the conventional technique of Pomeroy tubal ligation by minilaparotomy. Forty-four women requiring sterilization were randomly selected for either laparoscopy (n = 24) or minilaparotomy (n = 20). Mean operative time in the l...

A comparative study of two live measles vaccines in Iran