Unit:
Κατεύθυνση Πυρηνική Φυσική και Φυσική Στοιχειωδών Σωματιδίων (ΒΑΣΙΚΗ ΦΥΣΙΚΗ)Library of the School of Science
Author:
Κάτσης Άρης-Σπυρίδων
Supervisors info:
Τετράδης Νικόλαος Καθηγητής
Original Title:
Η φυσική των Classicalons
Translated title:
The physics of Classicalons
Summary:
Classicalization describes the emergence of a classical scattering length (r0)
at high energy scattering for some special non-renormalizable theories with
higher derivative terms, as well as Einstein for gravity. It has been proposed
that this length shields the inner region (r«r0) of the classicalons from
highly energetic probes. This idea leads to a remarkable correspondence of
high-energy-scattering with long-distance-scattering. The theories that exhibit
this phenomenon could be self-complete in the UV, a behavior different from the
standard weakly-coupled Wilsonian UV completion.
After discussing the concept of classicalization, we present some of the most
interesting applications of classicalization to the Standard Model and entropy
definition. Dirac-Born-Infeld theories appear to be the best candidate for the
phenomenon. We study them from the mathematical side, as well as with a quantum
mechanical toy model, in order to investigate the mechanism underlying
classicalization. Finally, we test if the classicalon-related form of the
theories is preserved after quantum corrections. We calculate the one-loop
effective action employing the heat kernel method on a classicalon background.
We obtain an explicit result for the condition the theory must satisfy so that
the quantum corrections are suppressed inside the classicalon.
Keywords:
Heat-kernel, Einstein Gravity, Quantum corrections, Classicalons, Dirac-Born-Infeld
