12243872
Toric AdS4/CFT3 duals and M-theory crystals
We study the recently proposed crystal model for three dimensional superconformal field theories arising from M2-branes probing toric Calabi-Yau four-fold singularities. We explain the algorithms mapping a toric Calabi-Yau to a crystal and vice versa, and show how the spectrum of BPS meson states fits into the crystal model.
12450781
Topological Chern-Simons sigma model
We consider topological twisting of recently constructed Chern-Simons-matter theories in three dimensions with = 4 or higher supersymmetry. We enumerate physically inequivalent twistings for each , and find two different twistings for = 4, one for = 5,6, and four for = 8. We construct the two types of = 4 topological theories, which we call A/B-models, in full detail. The A-model has been recently studied by Kapustin and Saulina. The B-model is new and it consists solely of a Chern-Simons term of a complex gauge field up to BRST-exact terms. We also compare the new theories with topological Yang-Mills theories and find some interesting connections. In particular, the A-model seems to offer a new perspective on Casson invariant and its relation to Rozansky-Witten theory.
118546288
Near horizon analysis of extremal AdS5 black holes
We study the near horizon geometry of extremal black holes in five dimensional gauged supergravity using Sen's entropy function formalism. Special attention is paid to the large black hole limit where the near horizon solution exhibits a universal dependence on the rotation. The physical properties of the large black hole solution are shown to agree with predictions from fluid mechanical description of the dual conformal field theory.
120277856
Calculation of spin depolarizing resonance strength
Cyclotron resonances and their effects upon polarized beams in cyclic hadron accelerators (beam energies from 70 GeV up to 20 TeV) are discussed.
119196758
Klebanov-Witten flows in M-theory
A bstractWe study renormalization group flows among three dimensional superconformal gauge theories which closely resemble the renowned Klebanov-Witten flow in four dimensions. In the large N limit, each theory appearing in the flow is holographically dual to M-theory on AdS4 times a toric Sasaki-Einstein seven-manifold. The theories are obtained through the so-called flavoring method, which adds some fundamental matter fields to the dimensionally reduced Klebanov-Witten theories. We reconfirm the matching between the gauge theories and the dual geometries by comparing the chiral ring structure. As a more refined test of the flows, we compute the three-sphere partition function of the gauge theories. The square of the free energy, inversely proportional to the volume of the seven-manifold, decreases by a universal ratio 16/27 for all flows considered in this paper.
73687599
Overcoming weak intrinsic depolarizing resonances with energy-jump
In the recent polarized proton runs in the AGS, a 5% partial snake was used successfully to overcome the imperfection depolarizing resonances. A polarized proton beam was accelerated up to the required RHIC injection energy of 25 GeV. However, a significant amount of polarization was lost at 0+/spl nu//sub y/, 12+/spl nu//sub y/ and 36+/spl nu//sub y/, which is believed to be partially due to the coupling resonances. To overcome the coupling resonance, an energy-jump was generated by rapidly changing the beam circumference using the powerful AGS RF system. It clearly demonstrates that the novel energy-jump method can successfully overcome coupling resonances and weak intrinsic resonances.
118756118
Anisotropy due to Brans-Dicke Theory
It is well known that the viscous Bianchi type-I metric of the Kasner form is not able to describe an anisotropic universe, which satisfies the second law of thermodynamics and the dominant energy condition in Einstein's theory of gravity. We investigate this problem in Brans-Dicke theory of gravity using the Bianchi type-I metric with the perfect fluid. We show that it is possible to have the dominant energy condition and the growth of entropy in this model. Also we apply this model to explain the anomaly concerning the low quadrupole amplitude of the angular power spectrum of the temperature anisotropy observed in WMAP data.
40073071
Self-Consistent Electron-Cloud Simulation for Long Proton Bunches
The results of numerical self-consistent electron-cloud simulations are presented and compared with data from the Proton Storage Ring at LANL. The ORBIT code with a recently developed electron-cloud module has been used. The model includes fully coupled “proton bunch – electron cloud” dynamics, a multipacting process model with a realistic secondary emission surface model, and a realistic lattice and injection scheme. The growth rates of proton-bunch transverse instabilities were studied as functions of the beam intensity, RF cavity voltage, external magnetic fields, and number of interaction points between protons and electrons in the model.