9,792 research outputs found
Perturbed Yukawa Textures in the Minimal Seesaw Model
\noindent We revisit the \textit{minimal seesaw model}, i.e., the type-I
seesaw mechanism involving only two right-handed neutrinos. % This model
represents an important minimal benchmark scenario for future experimental
updates on neutrino oscillations. % It features four real parameters that
cannot be fixed by the current data: two -violating phases, and
, as well as one complex parameter, , that is experimentally
inaccessible at low energies. % The parameter controls the structure of the
neutrino Yukawa matrix at high energies, which is why it may be regarded as a
label or index for all UV completions of the minimal seesaw model. % The fact
that encompasses only two real degrees of freedom allows us to
systematically scan the minimal seesaw model over all of its possible UV
completions. % In doing so, we address the following question: Suppose
and should be measured at particular values in the future---to what
extent is one then still able to realize approximate textures in the neutrino
Yukawa matrix? % Our analysis, thus, generalizes previous studies of the
minimal seesaw model based on the assumption of exact texture zeros. % In
particular, our study allows us to assess the theoretical uncertainty inherent
to the common texture ansatz. % One of our main results is that a normal
light-neutrino mass hierarchy is, in fact, still consistent with a two-zero
Yukawa texture, provided that the two texture zeros receive corrections at the
level of . % While our numerical
results pertain to the minimal seesaw model only, our general procedure appears
to be applicable to other neutrino mass models as well.Comment: 30 pages, 7 figures, 2 tables; v2: updated references, extended
discussion in the introduction and conclusions, new title, results unchanged,
content matches version published in JHE
Investigating accessibility indicators for feedback from a travel to a land use model
Activity locations such as work locations or leisure facilities are not uniformly distributed geographically. Also, the travel access to different locations is not uniform. It is plausible to assume that locations with easier access to other activity locations are more attractive than locations with less access. In consequence, urban simulation models such as UrbanSim use accessibility measures, such as ``number of jobs with 30 minutes by car', for several of their submodels. A problem, however, is that accessibility variables are not easy to compute within UrbanSim, for two reasons: 1) UrbanSim does not contain a travel model, and in consequence is not able to compute by itself the congestion effects resulting from land use decisions 2) The travel times are fed back from the travel model in the form of zone-to-zone travel time matrices. As is well known, such matrices grow quadratically in the number of zones. This limits the number of attributes that can be passed, for example different values for different times-of-day and/or for different activity purposes. These issues could be solved within UrbanSim, but only with considerable implementation effort. For that reason, it is important to consider how accessibility measures could be fed back from a travel model to UrbanSim. The present study will look at the question in how far location-based accessibility measures that are computed in the travel model and then fed back to UrbanSim could be used for this purposes. Those accessibility measures are no longer measures belonging to pairs of locations, but just belong to one location; a typical representative is a logsum term. In consequence, the number of entries now grows linearly in the number of locations, allowing much more freedom both in the number of considered locations and in the number of attributes that could be attached to every location that is considered in this way. This paper will address issues such as different spatial resulutions of such accessibility measures, comparisons between different accessibility measures, and computing times.
Low Energy Dynamics in Ultradegenerate QCD Matter
We study the low energy behavior of QCD Green functions in the limit that the
baryon chemical potential is much larger than the QCD scale parameter
. We show that there is a systematic low energy expansion in
powers of , where is the energy and is the
screening scale. This expansion is valid even if the effective quark-gluon
coupling is not small. The expansion is purely perturbative in the magnetic
regime . If the external momenta and energies satisfy , planar, abelian ladder diagrams involving the full quark
propagator have to be resummed but the corresponding Dyson-Schwinger equations
are closed.Comment: 4 pages, published versio
Low-Scale Leptogenesis in the Scotogenic Neutrino Mass Model
The scotogenic model proposed by Ernest Ma represents an attractive and
minimal example for the generation of small Standard Model neutrino masses via
radiative corrections in the dark matter sector. In this paper, we demonstrate
that, in addition to neutrino masses and dark matter, the scotogenic model also
allows to explain the baryon asymmetry of the Universe via low-scale
leptogenesis. First, we consider the case of two right-handed neutrinos (RHNs)
N_{1,2}, for which we provide an analytical argument why it is impossible to
push the RHN mass scale below M_1^min ~ 10^10 GeV, which is identical to the
value in standard thermal leptogenesis in the type-I seesaw scenario with the
same washout strength. Then, we present a detailed study of the three-RHN case
based on both an analytical and a numerical analysis. In the case of three
RHNs, we obtain a lower bound on the N_1 mass of around 10 TeV. Remarkably
enough, successful low-scale leptogenesis can be achieved without any
degeneracy in the RHN mass spectrum. The only necessary condition is a
suppression in the N_1 Yukawa couplings, which results in suppressed washout
and a small active neutrino mass of around 10^-12 eV. This leads to the
fascinating realization that low-scale leptogenesis in the scotogenic model can
be tested in experiments that aim at measuring the absolute neutrino mass
scale.Comment: 13 pages, 2 figures; v2: minor changes to the text, updated
discussion on direct detection bounds; content matches published versio
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