10 research outputs found
Brane world corrections to Newton's law
We discuss possible variations of the effective gravitational constant with
length scale, predicted by most of alternative theories of gravity and unified
models of physical interactions. After a brief general exposition, we review in
more detail the predicted corrections to Newton's law of gravity in diverse
brane world models. We consider various configurations in 5 dimensions (flat,
de Sitter and AdS branes in Einstein and Einstein-Gauss-Bonnet theories, with
and without induced gravity and possible incomplete graviton localization), 5D
multi-brane systems and some models in higher dimensions. A common feature of
all models considered is the existence of corrections to Newton's law at small
radii comparable with the bulk characteristic length: at such radii, gravity on
the brane becomes effectively multidimensional. Many models contain superlight
perturbation modes, which modify gravity at large scale and may be important
for astrophysics and cosmology.Comment: Brief review, 16 pages, 92 references. Some description and
references adde
Search for the Electric Dipole Moment of the tau Lepton
We have searched for a CP violation signature arising from an electric dipole
moment (d_tau) of the tau lepton in the e+e- -> tau+tau- reaction. Using an
optimal observable method and 29.5 fb^{-1} of data collected with the Belle
detector at the KEKB collider at sqrt{s} = 10.58 GeV, we find Re(d_tau) = (1.15
+- 1.70) x 10^{-17} ecm and Im(d_tau) = (-0.83 +- 0.86) x 10^{-17} ecm and set
the 95% confidence level limits -2.2 < Re(d_tau) < 4.5 (10^{-17}ecm) and -2.5 <
Im(d_tau) < 0.8 (10^{-17}ecm).Comment: 15 pages, LaTeX, 21 figures, submitted to Phys. Lett.
A Novel Mass Hierarchy and Discrete Excitation Spectra from Quantum-Fluctuating D-branes
We elaborate further on a recently proposed scenario for generating a mass
hierarchy through quantum fluctuations of a single D3 brane, which represents
our world embedded in a bulk five-dimensional space time. In this scenario, the
quantum fluctuations of the D3-brane world in the bulk direction, quantified to
leading order via a `recoil' world-sheet logarithmic conformal field theory
approach, result in the dynamical appearance of a supersymmetry breaking
(obstruction) scale alpha. This may be naturally taken to be at the TeV range,
in order to provide a solution to the conventional gauge-hierarchy problem. The
bulk spatial direction is characterized by the dynamical appearance of an
horizon located at +- 1/alpha, inside which the positive energy conditions for
the existence of stable matter are satisfied. To ensure the correct value of
the four-dimensional Planck mass, the bulk string scale M_s is naturally found
to lie at an intermediate energy scale of 10^{14} GeV. As an exclusive feature
of the D3-brane quantum fluctuations (`recoil') we find that, for any given
M_5, there is a discrete mass spectrum for four-dimensional Kaluza-Klein (KK)
modes of bulk graviton and/or scalar fields. KK modes with masses 0 <= m <
sqrt{2}alpha << M_s are found to have wavefunctions peaked, and hence
localized, on the D3 brane at z=0.Comment: 21 pages latex, three eps figures incorporate
Supersymmetry beyond minimal flavour violation
We review the sources and phenomenology of non-minimal flavour violation in
the MSSM. We discuss in some detail the most important theoretical and
experimental constraints, as well as promising observables to look for
supersymmetric effects at the LHC and in the future. We emphasize the
sensitivity of flavour physics to the mechanism of supersymmetry breaking and
to new degrees of freedom present at fundamental scales, such as the grand
unification scale. We include a discussion of present data that may hint at
departures from the Standard Model.Comment: 23pp. Version to appear in the EPJC special volume "Supersymmetry on
the Eve of the LHC", dedicated to the memory of Julius Wess. References and
brief discussion on collider signatures adde
The Economic Sustainability of Tourism Growth through Leakage Calculation
The development and growth of tourism depend on its sustainability over time and on its benefits for destinations as a whole. However, calculating sustainability is not an easy task. This article focuses on the economic sustainability of tourism growth and, after an exhaustive review of the literature, proposes a quantitative mathematical model to measure it by analysing and calculating leakage in the hotel sector. Leakage analyses the amount of revenue generated by tourists that does not remain in the destination economy. Through a sample of 204 interviews with managers, this study validates the model created and calculates leakage in a mass tourism destination (the Valencian Region in Spain). The paper opens new areas of research in sustainability literature and will be of value to tourism planners and governments in their efforts to implement appropriate tourism development policies.Garrigós Simón, FJ.; Galdón Salvador, JL.; Gil Pechuán, I. (2015). The economic sustainability of tourism growth through leakage calculation. Tourism Economics. 21(4):721-739. doi:10.5367/te.2014.0372721739214Abelson, P. (2011). Evaluating Major Events and Avoiding the Mercantilist Fallacy*. Economic Papers: A journal of applied economics and policy, 30(1), 48-59. doi:10.1111/j.1759-3441.2011.00096.xAdams, P. D., & Parmenter, B. R. (1995). An applied general equilibrium analysis of the economic effects of tourism in a quite small, quite open economy. Applied Economics, 27(10), 985-994. doi:10.1080/00036849500000079Archer, B. (1995). Importance of tourism for the economy of Bermuda. Annals of Tourism Research, 22(4), 918-930. doi:10.1016/0160-7383(95)00018-1Archer, B., & Fletcher, J. (1996). The economic impact of tourism in the Seychelles. Annals of Tourism Research, 23(1), 32-47. doi:10.1016/0160-7383(95)00041-0Arrow, K., Bolin, B., Costanza, R., Dasgupta, P., Folke, C., Holling, C. S., … Pimentel, D. (1995). 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Impacts of community-based conservation on local communities in the Annapurna Conservation Area, Nepal
Service quality of travel agents in Turkey
Travel Agent, Satisfaction, Servqual, Service quality, Perception, Expectation, Factor analysis, Regression analysis,
Flavour Physics of Leptons and Dipole Moments.
This chapter of the report of the ``Flavour in the era of the LHC'' Workshop
discusses the theoretical, phenomenological and experimental issues related to
flavour phenomena in the charged lepton sector and in flavour-conserving
CP-violating processes. We review the current experimental limits and the main
theoretical models for the flavour structure of fundamental particles. We
analyze the phenomenological consequences of the available data, setting
constraints on explicit models beyond the Standard Model, presenting benchmarks
for the discovery potential of forthcoming measurements both at the LHC and at
low energy, and exploring options for possible future experiments.Comment: Report of Working Group 3 of the CERN Workshop ``Flavour in the era
of the LHC'', Geneva, Switzerland, November 2005 -- March 200