Is string theory predictive?
String theory as a theory of everything has been criticized as unscientific because it is so difficult to test by experiments. The controversy centers around two properties: • It is widely believed that any theory of quantum gravity would require extremely high energies to probe directly, higher by orders of magnitude than those that current experiments such as the Large Hadron Collider can reach. • String theory as it is currently understood has a huge number of equally possible solutions, called string vacua and these vacua might be sufficiently diverse to explain almost any phenomena we might observe at lower energies. If these properties are true, string theory as a theory of everything would have little or no predictive power for low energy particle physics experiments. Because the theory is so difficult to test, some theoretical physicists have asked if it can even be called a scientific theory. Notable critics include Peter Woit, Lee Smolin, Philip Anderson , Sheldon Glashow, La
