3,526 research outputs found
Finite Theories after the discovery of a Higgs-like boson at the LHC
Finite Unified Theories (FUTs) are N = 1 supersymmetric Grand Unified
Theories (GUTs) which can be made finite to all-loop orders, based on the
principle of reduction of couplings, and therefore are provided with a large
predictive power. Confronting the predictions of SU(5) FUTs with the top and
bottom quark masses and other low-energy experimental constraints a light
Higgs-boson mass in the range M_h ~ 121-126 GeV was predicted, in striking
agreement with the recent discovery of a Higgs-like state around ~ 125.7 GeV at
ATLAS and CMS. Furthermore the favoured model, a finiteness constrained version
of the MSSM, naturally predicts a relatively heavy spectrum with coloured
supersymmetric particles above ~ 1.5 TeV, consistent with the non-observation
of those particles at the LHC. Restricting further the best FUT's parameter
space according to the discovery of a Higgs-like state and B-physics
observables we find predictions for the rest of the Higgs masses and the
s-spectrum.Comment: 17 pages, 4 figures. arXiv admin note: substantial text overlap with
arXiv:0712.363
The LHC Higgs Boson Discovery: Implications for Finite Unified Theories
Finite Unified Theories (FUTs) are N = 1 supersymmetric Grand Unified
Theories (GUTs) which can be made finite to all-loop orders, based on the
principle of reduction of couplings, and therefore are provided with a large
predictive power. We confront the predictions of an SU(5) FUT with the top and
bottom quark masses and other low-energy experimental constraints, resulting in
a relatively heavy SUSY spectrum, naturally consistent with the non-observation
of those particles at the LHC. The light Higgs boson mass is automatically
predicted in the range compatible with the Higgs discovery at the LHC.
Requiring a light Higgs-boson mass in the precise range of M_h = 125.6 +- 2.1
GeV favors the lower part of the allowed spectrum, resulting in clear
predictions for the discovery potential at current and future pp, as well as
future e+e- colliders.Comment: 31 pages, 3 figures, review prepared for IJMP
Finite Unified Theories confronted with low-energy phenomenology
Finite Unified Theories (FUTs) are N=1 supersymmetric Grand Unified Theories
that can be made all-loop finite. The requirement of all-loop finiteness leads
to a severe reduction of the free parameters of the theory and, in turn, to a
large number of predictions. Here SU(5) FUTs are investigated in the context of
low-energy phenomenology observables. We present a detailed scanning of these
FUTs, including theoretical uncertainties at the unification scale and applying
all phenomenological constraints. Taking into account the restrictions from the
top and bottom quark masses, we can discriminate between different models.
Including further low-energy constraints such as physics observables, the
bound on the lightest Higgs boson mass and the cold dark matter density, we
determine the predictions of the allowed parameter space for the Higgs boson
sector and the supersymmetric particle spectrum of the model.Comment: Submitted for the SUSY07 proceedings, 4 pages, LaTeX, 3 eps figures.
v2 one ref adde
Confronting Finite Unified Theories with Low-Energy Phenomenology
Finite Unified Theories (FUTs) are N=1 supersymmetric Grand Unified
Theories that can be made all-loop finite. The requirement of all-loop
finiteness leads to a severe reduction of the free parameters of the theory
and, in turn, to a large number of predictions. FUTs are investigated in the
context of low-energy phenomenology observables. We present a detailed scanning
of the all-loop finite SU(5) FUTs, where we include the theoretical
uncertainties at the unification scale and we apply several phenomenological
constraints. Taking into account the restrictions from the top and bottom quark
masses, we can discriminate between different models. Including further
low-energy constraints such as B physics observables, the bound on the lightest
Higgs boson mass and the cold dark matter density, we determine the predictions
of the allowed parameter space for the Higgs boson sector and the
supersymmetric particle spectrum of the selected model.Comment: 25 pages, 8 figures. Discussion on models and on cold dark matter
constraint extended, references added. Version to appear in JHE
Finite Unified Models
We present phenomenologically viable unified models which are finite
to all orders before the spontaneous symmetry breaking. In the case of two
models with three families the top quark mass is predicted to be 178.8 GeV.Comment: 13 pages, latex fil
Finite SU(3)^3 model
We consider N=1 supersymmetric gauge theories based on the group SU(N)_1 x
SU(N)_2 x ... x SU(N)_k with matter content (N,N*,1,...,1) + (1,N,N*,..., 1) +
>... + (N*,1,1,...,N) as candidates for the unification symmetry of all
particles. In particular we examine to which extent such theories can become
finite, and find that a necessary condition is that there should be exactly
three families. From phenomenological considerations an SU(3)^3 model is
singled out. We consider an all-loop and a two-loop finite model based on this
gauge group and we study their predictions concerning the third generation
quark masses.Comment: 4 pages, 2 figures. Talk given at 17th International Conference on
Supersymmetry and the Unification of Fundamental Interactions (SUSY09),
Boston, USA, 5-10 June 200
Finite Unified Theories and the Higgs mass prediction
Finite Unified Theories (FUTs) are N=1 supersymmetric Grand Unified Theories,
which can be made all-loop finite, both in the dimensionless (gauge and Yukawa
couplings) and dimensionful (soft supersymmetry breaking terms) sectors. This
remarkable property provides a drastic reduction in the number of free
parameters, which in turn leads to an accurate prediction of the top quark mass
in the dimensionless sector, and predictions for the Higgs boson mass and the
supersymmetric spectrum in the dimensionful sector. Here we examine the
predictions of two FUTs taking into account a number of theoretical and
experimental constraints. For the first one we present the results of a
detailed scanning concerning the Higgs mass prediction, while for the second we
present a representative prediction of its spectrum.Comment: 16 pages, 4 figure
Weighted Multiplex Networks
One of the most important challenges in network science is to quantify the
information encoded in complex network structures. Disentangling randomness
from organizational principles is even more demanding when networks have a
multiplex nature. Multiplex networks are multilayer systems of nodes that
can be linked in multiple interacting and co-evolving layers. In these
networks, relevant information might not be captured if the single layers were
analyzed separately. Here we demonstrate that such partial analysis of layers
fails to capture significant correlations between weights and topology of
complex multiplex networks. To this end, we study two weighted multiplex
co-authorship and citation networks involving the authors included in the
American Physical Society. We show that in these networks weights are strongly
correlated with multiplex structure, and provide empirical evidence in favor of
the advantage of studying weighted measures of multiplex networks, such as
multistrength and the inverse multiparticipation ratio. Finally, we introduce a
theoretical framework based on the entropy of multiplex ensembles to quantify
the information stored in multiplex networks that would remain undetected if
the single layers were analyzed in isolation.Comment: (22 pages, 10 figures
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