56 research outputs found
Warped Electroweak Breaking Without Custodial Symmetry
We propose an alternative to the introduction of an extra gauge (custodial)
symmetry to suppress the contribution of KK modes to the T parameter in warped
theories of electroweak breaking. The mechanism is based on a general class of
warped 5D metrics and a Higgs propagating in the bulk. The metrics are nearly
AdS in the UV region but depart from AdS in the IR region, towards where KK
fluctuations are mainly localized, and have a singularity outside the slice
between the UV and IR branes. This gravitational background is generated by a
bulk stabilizing scalar field which triggers a natural solution to the
hierarchy problem. Depending on the model parameters, gauge-boson KK modes can
be consistent with present bounds on EWPT for m > 1 TeV at 95% CL. The model
contains a light Higgs mode which unitarizes the four-dimensional theory. The
reduction in the precision observables can be traced back to a large wave
function renormalization for this mode.Comment: 15 pages, 3 figure
Soft-Wall Stabilization
We propose a general class of five-dimensional soft-wall models with AdS
metric near the ultraviolet brane and four-dimensional Poincar\'e invariance,
where the infrared scale is determined dynamically. A large UV/IR hierarchy can
be generated without any fine-tuning, thus solving the electroweak/Planck scale
hierarchy problem. Generically, the spectrum of fluctuations is discrete with a
level spacing (mass gap) provided by the inverse length of the wall, similar to
RS1 models with Standard Model fields propagating in the bulk. Moreover two
particularly interesting cases arise. They can describe: (a) a theory with a
continuous spectrum above the mass gap which can model unparticles
corresponding to operators of a CFT where the conformal symmetry is broken by a
mass gap, and; (b) a theory with a discrete spectrum provided by linear Regge
trajectories as in AdS/QCD models.Comment: 27 pages, 6 figures, 1 table. v2: references added, version to appear
in NJP Focus Issue on Extra Dimension
Flavor Phenomenology in General 5D Warped Spaces
We have considered a general 5D warped model with SM fields propagating in
the bulk and computed explicit expressions for oblique and non-oblique
electroweak observables as well as for flavor and CP violating effective
four-fermion operators. We have compared the resulting lower bounds on the
Kaluza-Klein (KK) scale in the RS model and a recently proposed model with a
metric modified towards the IR brane, which is consistent with oblique
parameters without the need for a custodial symmetry. We have randomly
generated 40,000 sets of O(1) 5D Yukawa couplings and made a fit of the quark
masses and CKM matrix elements in both models. This method allows to identify
the percentage of points consistent with a given KK mass, which in turn
provides us with a measure for the required fine-tuning. Comparison with
current experimental data on Rb, FCNC and CP violating operators exhibits an
improved behavior of our model with respect to the RS model. In particular,
allowing 10% fine-tuning the combined results point towards upper bounds on the
KK gauge boson masses around 3.3 TeV in our model as compared with 13 TeV in
the RS model. One reason for this improvement is that fermions in our model are
shifted, with respect to fermions in the RS model, towards the UV brane thus
decreasing the strength of the modifications of electroweak observables.Comment: 28 pages, 7 figures, 4 table
Investigations of the Andean Past: Papers from the First Annual Northeast Conference on Andean Archaeology and Ethnohistory
The papers included in this volume represent fourteen of the twenty-three original papers presented at the First Annual Northeast Conference on Andean Archaeology and Ethnohistory held at Cornell University on November 13th and 14th, 1982. The papers are: The Preceramic Occupations of the Casma Valley, Peru by Michael A. Malpass, The Historical Development of a Coastal Andean Social Formation in Central Peru, 6000 to 500 B.C. by Thomas C. Patterson, Stone Tools in Ceramic Contexts: Exploring the Unstructured by Joan M. Gero, Possible Uses, Roles, and Meanings of Chavin-style Painted Textiles of South Coast Peru by Rebecca R. Stone, Megalithic Sites in the Nepena Valley, Peru by Richard E. Daggett, Huaca del Loro Revisited: The Nasca-Huarpa Connection by Allison C. Paulsen, Spatial Patterning and the Function of a Huari Architectural Compound by Christine C. Brewster-Wray, The Development of Huari Administrative Architecture by Lynda E. Spickard, Aspects of State Ideology in Huari and Tiwanaku Iconography: The Central Deity and the Sacrificer by Anita G. Cook, Shared Ideology and Parallel Political Development: Huari and Tiwanaku by William H. Isbell, Casma Incised Pottery: An Analysis of Collections from the Nepena Valley by Cheryl Daggett, High Altitude Land Use in the Huamachuco Area by T. McGreevy and R. Shaughnessy, La Lengua Pescadora: the Lost Dialect of Chimu Fishermen by Joel Rabinowitz, and The Chancas of Angaraes: 1450(?)--1765 by Paul H. Dillon.https://digitalcommons.library.umaine.edu/andean_past_special/1002/thumbnail.jp
Suppressing Electroweak Precision Observables in 5D Warped Models
We elaborate on a recently proposed mechanism to suppress large contributions
to the electroweak precision observables in five dimensional (5D) warped
models, without the need for an extended 5D gauge sector. The main ingredient
is a modification of the AdS metric in the vicinity of the infrared (IR) brane
corresponding to a strong deviation from conformality in the IR of the 4D
holographic dual. We compute the general low energy effective theory of the 5D
warped Standard Model, emphasizing additional IR contributions to the wave
function renormalization of the light Higgs mode. We also derive expressions
for the S and T parameters as a function of a generic 5D metric and zero-mode
wave functions. We give an approximate formula for the mass of the radion that
works even for strong deviation from the AdS background. We proceed to work out
the details of an explicit model and derive bounds for the first KK masses of
the various bulk fields. The radion is the lightest new particle although its
mass is already at about 1/3 of the mass of the lightest resonances, the KK
states of the gauge bosons. We examine carefully various issues that can arise
for extreme choices of parameters such as the possible reintroduction of the
hierarchy problem, the onset of nonperturbative physics due to strong IR
curvature or the creation of new hierarchies near the Planck scale. We conclude
that a KK scale of 1 TeV is compatible with all these constraints.Comment: 44 pages, 11 figures, references adde
Introduction: Toward an Engaged Feminist Heritage Praxis
We advocate a feminist approach to archaeological heritage work in order to transform heritage practice and the production of archaeological knowledge. We use an engaged feminist standpoint and situate intersubjectivity and intersectionality as critical components of this practice. An engaged feminist approach to heritage work allows the discipline to consider womenâs, menâs, and gender non-conforming personsâ positions in the field, to reveal their contributions, to develop critical pedagogical approaches, and to rethink forms of representation. Throughout, we emphasize the intellectual labor of women of color, queer and gender non-conforming persons, and early white feminists in archaeology
Breast and Prostate Cancer Risks for Male BRCA1 and BRCA2 Pathogenic Variant Carriers Using Polygenic Risk Scores
Background: Recent population-based female breast cancer and prostate cancer polygenic risk scores (PRS) have been developed. We assessed the associations of these PRS with breast and prostate cancer risks for male BRCA1 and BRCA2 pathogenic variant carriers. Methods: 483 BRCA1 and 1318 BRCA2 European ancestry male carriers were available from the Consortium of Investigators of Modifiers of BRCA1/2 (CIMBA). A 147-single nucleotide polymorphism (SNP) prostate cancer PRS (PRSPC) and a 313-SNP breast cancer PRS were evaluated. There were 3 versions of the breast cancer PRS, optimized to predict overall (PRSBC), estrogen receptor (ER)-negative (PRSER-), or ER-positive (PRSER+) breast cancer risk. Results: PRSER+ yielded the strongest association with breast cancer risk. The odds ratios (ORs) per PRSER+ standard deviation estimates were 1.40 (95% confidence interval [CI] =1.07 to 1.83) for BRCA1 and 1.33 (95% CI = 1.16 to 1.52) for BRCA2 carriers. PRSPC was associated with prostate cancer risk for BRCA1 (OR = 1.73, 95% CI = 1.28 to 2.33) and BRCA2 (OR = 1.60, 95% CI = 1.34 to 1.91) carriers. The estimated breast cancer odds ratios were larger after adjusting for female relative breast cancer family history. By age 85 years, for BRCA2 carriers, the breast cancer risk varied from 7.7% to 18.4% and prostate cancer risk from 34.1% to 87.6% between the 5th and 95th percentiles of the PRS distributions. Conclusions: Population-based prostate and female breast cancer PRS are associated with a wide range of absolute breast and prostate cancer risks for male BRCA1 and BRCA2 carriers. These findings warrant further investigation aimed at providing personalized cancer risks for male carriers and informing clinical management.Peer reviewe
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