Iafelice, Pasquale Luca
(2008)

*Perturbative and non perturbative effects in the Standard Model and orbifolded ADS/CFT based theories*, [Dissertation thesis], Alma Mater Studiorum Università di Bologna.
Dottorato di ricerca in

Fisica, 20 Ciclo. DOI 10.6092/unibo/amsdottorato/844.

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## Abstract

We study some perturbative and nonperturbative effects in the framework of the
Standard Model of particle physics. In particular we consider the time dependence
of the Higgs vacuum expectation value given by the dynamics of the StandardModel
and study the non-adiabatic production of both bosons and fermions,
which is intrinsically non-perturbative. In theHartree approximation, we analyze
the general expressions that describe the dissipative dynamics due to the backreaction
of the produced particles. Then, we solve numerically some relevant
cases for the Standard Model phenomenology in the regime of relatively small
oscillations of the Higgs vacuum expectation value (vev). As perturbative effects,
we consider the leading logarithmic resummation in small Bjorken x QCD, concentrating
ourselves on the Nc dependence of the Green functions associated to
reggeized gluons. Here the eigenvalues of the BKP kernel for states of more than
three reggeized gluons are unknown in general, contrary to the large Nc limit
(planar limit) case where the problem becomes integrable. In this contest we consider
a 4-gluon kernel for a finite number of colors and define some simple toy
models for the configuration space dynamics, which are directly solvable with
group theoretical methods. In particular we study the depencence of the spectrum
of thesemodelswith respect to the number of colors andmake comparisons
with the planar limit case. In the final part we move on the study of theories
beyond the Standard Model, considering models built on AdS5 S5/Γ orbifold
compactifications of the type IIB superstring, where Γ is the abelian group Zn.
We present an appealing three family N = 0 SUSY model with n = 7 for the order
of the orbifolding group. This result in a modified Pati–Salam Model which
reduced to the StandardModel after symmetry breaking and has interesting phenomenological
consequences for LHC.

Abstract

We study some perturbative and nonperturbative effects in the framework of the
Standard Model of particle physics. In particular we consider the time dependence
of the Higgs vacuum expectation value given by the dynamics of the StandardModel
and study the non-adiabatic production of both bosons and fermions,
which is intrinsically non-perturbative. In theHartree approximation, we analyze
the general expressions that describe the dissipative dynamics due to the backreaction
of the produced particles. Then, we solve numerically some relevant
cases for the Standard Model phenomenology in the regime of relatively small
oscillations of the Higgs vacuum expectation value (vev). As perturbative effects,
we consider the leading logarithmic resummation in small Bjorken x QCD, concentrating
ourselves on the Nc dependence of the Green functions associated to
reggeized gluons. Here the eigenvalues of the BKP kernel for states of more than
three reggeized gluons are unknown in general, contrary to the large Nc limit
(planar limit) case where the problem becomes integrable. In this contest we consider
a 4-gluon kernel for a finite number of colors and define some simple toy
models for the configuration space dynamics, which are directly solvable with
group theoretical methods. In particular we study the depencence of the spectrum
of thesemodelswith respect to the number of colors andmake comparisons
with the planar limit case. In the final part we move on the study of theories
beyond the Standard Model, considering models built on AdS5 S5/Γ orbifold
compactifications of the type IIB superstring, where Γ is the abelian group Zn.
We present an appealing three family N = 0 SUSY model with n = 7 for the order
of the orbifolding group. This result in a modified Pati–Salam Model which
reduced to the StandardModel after symmetry breaking and has interesting phenomenological
consequences for LHC.

Tipologia del documento

Tesi di dottorato

Autore

Iafelice, Pasquale Luca

Supervisore

Co-supervisore

Dottorato di ricerca

Ciclo

20

Coordinatore

Settore disciplinare

Parole chiave

non adiabatic quantum effects finite Nc effects quiver gauge theory beyond standard model

URN:NBN

DOI

10.6092/unibo/amsdottorato/844

Data di discussione

19 Maggio 2008

URI

## Altri metadati

Tipologia del documento

Tesi di dottorato

Autore

Iafelice, Pasquale Luca

Supervisore

Co-supervisore

Dottorato di ricerca

Ciclo

20

Coordinatore

Settore disciplinare

Parole chiave

non adiabatic quantum effects finite Nc effects quiver gauge theory beyond standard model

URN:NBN

DOI

10.6092/unibo/amsdottorato/844

Data di discussione

19 Maggio 2008

URI

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