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4.0
Jun 30, 2018
06/18
by
Anna M. Barry; F. Hajir; P. G. Kevrekidis
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In this work, we construct suitable generating functions for vortices of alternating signs in the realm of Bose-Einstein condensates. In addition to the vortex-vortex interaction included in earlier fluid dynamics constructions of such functions, the vortices here precess around the center of the trap. This results in the generating functions of the vortices of positive charge and of negative charge satisfying a modified, so-called, Tkachenko differential equation. From that equation, we...
Topics: Nonlinear Sciences, Quantum Gases, Mathematics, Pattern Formation and Solitons, Mathematical...
Source: http://arxiv.org/abs/1407.7965
3
3.0
Jun 30, 2018
06/18
by
Bruno Rousseau; François Lapointe; Minh Nguyen; Maxime Biron; Etienne Gaufrès; Saman Choubak; Zheng Han; Vincent Bouchiat; Patrick Desjardins; Michel Côté; Richard Martel
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Herein, intervalley scattering is exploited to account for anomalous antiresonances in the infrared spectra of doped and disordered single layer graphene. We present infrared spectroscopy measurements of graphene grafted with iodophenyl moieties in both reflection microscopy and transmission configurations. Asymmetric transparency windows at energies corresponding to phonon modes near the {\Gamma} and K points are observed, in contrast to the featureless spectrum of pristine graphene. These...
Topics: Mesoscale and Nanoscale Physics, Materials Science, Condensed Matter
Source: http://arxiv.org/abs/1407.8141
5
5.0
Jun 30, 2018
06/18
by
G. Bruni; J. I. González-Serrano; M. Pedani; C. R. Benn; K. -H. Mack; J. Holt; F. M. Montenegro-Montes; F. Jiménez-Luján
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Broad absorption lines (BALs) are present in the spectra of ~20% of quasars (QSOs); this indicates fast outflows (up to 0.2c) that intercept the observer's line of sight. These QSOs can be distinguished again into radio-loud (RL) BAL QSOs and radio-quiet (RQ) BAL QSOs. The first are very rare, even four times less common than RQ BAL QSOs. The reason for this is still unclear and leaves open questions about the nature of the BAL-producing outflows and their connection with the radio jet. We...
Topics: Astrophysics of Galaxies, Astrophysics
Source: http://arxiv.org/abs/1407.7987
5
5.0
Jun 30, 2018
06/18
by
J. S. Sanders; A. C. Fabian; J. Hlavacek-Larrondo; H. R. Russell; G. B. Taylor; F. Hofmann; G. Tremblay; S. A. Walker
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We present Chandra X-ray Observatory observations of the core of the galaxy cluster PKS 0745-191. Its centre shows X-ray cavities caused by AGN feedback and cold fronts with an associated spiral structure. The cavity energetics imply they are powerful enough to compensate for cooling. Despite the evidence for AGN feedback, the Chandra and XMM-RGS X-ray spectra are consistent with a few hundred solar masses per year cooling out of the X-ray phase, sufficient to power the emission line nebula....
Topics: Astrophysics of Galaxies, Astrophysics, Cosmology and Nongalactic Astrophysics
Source: http://arxiv.org/abs/1407.8008
3
3.0
Jun 30, 2018
06/18
by
M. Zuppardo; J. P. Santos; G. De Chiara; M. Paternostro; F. L. Semiao; G. M. Palma
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We describe an apparatus designed to make non-demolition measurements on a Bose-Einstein condensate (BEC) trapped in a double-well optical cavity. This apparatus contains, as well as the bosonic gas and the trap, an optical cavity. We show how the interaction between the light and the atoms, under appropriate conditions, can allow for a weakly disturbing yet highly precise measurement of the population imbalance between the two wells and its variance. We show that the setting is well suited for...
Topics: Quantum Physics, Quantum Gases, Condensed Matter
Source: http://arxiv.org/abs/1407.8077
3
3.0
Jun 30, 2018
06/18
by
P. Popesso; A. Biviano; A. Finoguenov; D. Wilman; M. Salvato; B. Magnelli; C. Gruppioni; F. Pozzi; G. Rodighiero; F. Ziparo; S. Berta; D. Elbaz; M. Dickinson; D. Lutz; B. Altieri; H. Aussel; A. Cimatti; D. Fadda; O. Ilbert; E. Le Floch; R. Nordon; A. Poglitsch; C. K. Xu
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There is now a large consensus that the current epoch of the Cosmic Star Formation History (CSFH) is dominated by low mass galaxies while the most active phase at 1~1, the most IR-luminous galaxies (LIRGs and ULIRGs) are preferentially located in groups, and this is consistent with a reversal of the star-formation rate vs .density anti-correlation observed in the nearby Universe. At these redshifts, group galaxies contribute 60-80% of the CSFH, i.e. much more than at lower redshifts. Below z~1,...
Topics: Astrophysics of Galaxies, Astrophysics, Cosmology and Nongalactic Astrophysics
Source: http://arxiv.org/abs/1407.8214
6
6.0
Jun 30, 2018
06/18
by
P. Popesso; A. Biviano; A. Finoguenov; D. Wilman; M. Salvato; B. Magnelli; C. Gruppioni; F. Pozzi; G. Rodighiero; F. Ziparo; S. Berta; D. Elbaz; M. Dickinson; D. Lutz; B. Altieri; H. Aussel; A. Cimatti; D. Fadda; O. Ilbert; E. Le Floch; R. Nordon; A. Poglitsch; S. Genel; C. K. Xu
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The most striking feature of the Cosmic Star Formation History (CSFH) of the Universe is a dramatic drop of the star formation (SF) activity, since z~1. In this work we investigate if the very same process of assembly and growth of structures is one of the major drivers of the observed decline. We study the contribution to the CSFH of galaxies in halos of different masses. This is done by studying the total SFR-halo mass-redshift plane from redshift 0 to redshift z~1.6 in a sample of 57 groups...
Topics: Astrophysics of Galaxies, Astrophysics
Source: http://arxiv.org/abs/1407.8231
5
5.0
Jun 30, 2018
06/18
by
S. Kaviraj; M. Huertas-Company; S. Cohen; S. Peirani; R. A. Windhorst; R. W. O'Connell; J. Silk; M. A. Dopita; N. P. Hathi; A. M. Koekemoer; S. Mei; M. Rutkowski; R. E. Ryan; F. Shankar
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We study of the role of major mergers (mass ratios >1:4) in driving size growth in high-redshift (1 10^10.7 MSun SGs at z
Topics: Astrophysics of Galaxies, Astrophysics
Source: http://arxiv.org/abs/1407.8185
4
4.0
Jun 30, 2018
06/18
by
Taras Verkholyak; Jozef Strecka; Frederic Mila; Kai P. Schmidt
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Exact ground states of a spin-1/2 Ising-Heisenberg model on the Shastry-Sutherland lattice with Heisenberg intra-dimer and Ising inter-dimer couplings are found by two independent rigorous procedures. The first method uses a unitary transformation to establish a mapping correspondence with an effective classical spin model, while the second method relies on the derivation of an effective hard-core boson model by continuous unitary transformations. Both methods lead to equivalent effective...
Topics: Statistical Mechanics, Condensed Matter
Source: http://arxiv.org/abs/1407.8229
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63
Jun 30, 2018
06/18
by
Yuancheng Fan; Fuli Zhang; Qian Zhao; Zeyong Wei; Hongqiang Li
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Coherent perfect absorber (CPA) was proposed as the time-reversed counterpart to laser: a resonator containing lossy medium instead of gain medium can absorb the coherent optical fields completely. Here, we exploit a monolayer graphene to realize the CPA in a non-resonant manner. It is found that quasi-CPA point exists in the terahertz regime for suspending monolayer graphene, and the CPA can be implemented with the assistant of proper phase modulation among two incident beams at the quasi-CPA...
Topics: Physics, Mesoscale and Nanoscale Physics, Optics, Materials Science, Condensed Matter
Source: http://arxiv.org/abs/1407.7961
3
3.0
Jun 30, 2018
06/18
by
Yuchen Peng; Frank Gaitan
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Successful implementation of a fault-tolerant quantum computation on a system of qubits places severe demands on the hardware used to control the many-qubit state. It is known that an accuracy threshold $P_{a}$ exists for any quantum gate that is to be used in such a computation. Specifically, the error probability $P_{e}$ for such a gate must fall below the accuracy threshold: $P_{e} < P_{a}$. Estimates of $P_{a}$ vary widely, though $P_{a}\sim 10^{-4}$ has emerged as a challenging target...
Topics: Quantum Physics, Mesoscale and Nanoscale Physics, Condensed Matter
Source: http://arxiv.org/abs/1407.8074
