1,048 research outputs found
\theta^PMNS_13 = \theta_C / \sqrt2 from GUTs
The recent observations of the leptonic mixing angle \theta^PMNS_13 are
consistent with \theta^PMNS_13 = \theta_C / \sqrt2 (with \theta_C being the
Cabibbo angle \theta^CKM_12). We discuss how this relation can emerge in Grand
Unified Theories (GUTs) via charged lepton corrections. The key ingredient is
that in GUTs the down-type quark Yukawa matrix and the charged lepton Yukawa
matrix are generated from the same set of GUT operators, which implies that the
resulting entries are linked and differ only by group theoretical Clebsch
factors. This allows a link \theta^e_12 = \theta_C to be established, which can
induce \theta^PMNS_13 = \theta_C / \sqrt2 provided that the 1-3 mixing in the
neutrino mass matrix is much smaller than \theta_C. We find simple conditions
under which \theta^PMNS_13 = \theta_C / \sqrt2 can arise via this link in SU(5)
GUTs and Pati-Salam models. We also discuss possible corrections to this
relation. Using lepton mixing sum rules different neutrino mixing patterns can
be distinguished by their predictions for the Dirac CP phase \delta^PMNS.Comment: v3: 18 pages, section on corrections to exact relation adde
General analysis of mathematical models for bone remodeling
Bone remodeling is regulated by pathways controlling the interplay of
osteoblasts and osteoclasts. In this work, we apply the method of generalized
modelling to systematically analyse a large class of models of bone remodeling.
Our analysis shows that osteoblast precursors can play an important role in the
regulation of bone remodeling. Further, we find that the parameter regime most
likely realized in nature lies very close to bifurcation lines, marking
qualitative changes in the dynamics. Although proximity to a bifurcation
facilitates adaptive responses to changing external conditions, it entails the
danger of losing dynamical stability. Some evidence implicates such dynamical
transitions as a potential mechanism leading to forms of Paget's disease
Time dependent transport phenomena
The aim of this review is to give a pedagogical introduction to our recently
proposed ab initio theory of quantum transport.Comment: 28 pages, 18 figure
Complexer-YOLO: Real-Time 3D Object Detection and Tracking on Semantic Point Clouds
Accurate detection of 3D objects is a fundamental problem in computer vision
and has an enormous impact on autonomous cars, augmented/virtual reality and
many applications in robotics. In this work we present a novel fusion of neural
network based state-of-the-art 3D detector and visual semantic segmentation in
the context of autonomous driving. Additionally, we introduce
Scale-Rotation-Translation score (SRTs), a fast and highly parameterizable
evaluation metric for comparison of object detections, which speeds up our
inference time up to 20\% and halves training time. On top, we apply
state-of-the-art online multi target feature tracking on the object
measurements to further increase accuracy and robustness utilizing temporal
information. Our experiments on KITTI show that we achieve same results as
state-of-the-art in all related categories, while maintaining the performance
and accuracy trade-off and still run in real-time. Furthermore, our model is
the first one that fuses visual semantic with 3D object detection
Microcanonical entropy inflection points: Key to systematic understanding of transitions in finite systems
We introduce a systematic classification method for the analogs of phase
transitions in finite systems. This completely general analysis, which is
applicable to any physical system and extends towards the thermodynamic limit,
is based on the microcanonical entropy and its energetic derivative, the
inverse caloric temperature. Inflection points of this quantity signal
cooperative activity and thus serve as distinct indicators of transitions. We
demonstrate the power of this method through application to the long-standing
problem of liquid-solid transitions in elastic, flexible homopolymers.Comment: 4 pages, 3 figure
Chinese and American Perceptions on Nonprofit Organizational Effectiveness
Dynamically assigning sub-carriers of orthogonal frequency division multiplexing (OFDM) systems to multiple different terminals in a cell has been shown to be beneficial in terms of different transmission metrics. The success of such a scheme, however depends on the ability of the access point to inform terminals of their newest sub-carrier assignments as well as on the accuracy of the channel state information used to generate new assignments. It is not clear whether the overhead required to implement these two functions consumes all of the potential performance increase possible by dynamically assigning subcarriers. In this paper, a specific MAC structure is selected enabling the operation of a dynamic OFDM system, incorporating a signalling scheme for dynamically assigned sub-carriers. Based on this structure, we study the overhead required for a dynamic sub-carrier scheme; a static variant that serves as a comparison case. We investigate the performance difference of these two schemes for various scenarios where at first signalling and then realistic channel knowledge is added to the system model. Average throughput and goodput per terminal serve as figures of merit; the number of terminals in the cell, the transmission power per sub-carrier, the delay spread and the movement speed of the terminals are varied. We find that a realistic overhead model decreases the performance of both static and dynamic schemes such that the overall ratio favours in all cases except for higher speeds the dynamic rather than the static scheme especially in realistic system environments.QC 20131129</p
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