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23427596 documents, page 2 of 2342760

Panchromatic Imaging of a Transitional Disk: The Disk of GM Aur in Optical and FUV Scattered Light

Hornbeck, Jeremy; Swearingen, Jeremy; Grady, Carol; Williger, G.; Broan, A.; Sitko, M.; Wisniewski, J.; Perrin, M.; Lauroesch, J.; Schneider, G.; Apai, D.; Brittain, S.; Brown, J.; Champnew, E.; Hamaguchi, K.;... (2016)
We have imaged GM Aur with HST, detected its disk in scattered light at 1400A and 1650A, and compared these with observations at 3300A, 5550A, 1.1 microns, and 1.6 microns. The scattered light increases at shorter wavelengths. The radial surface brightness profile at 3300A shows no evidence of the 24AU radius cavity that has been previously observed in sub-mm observations. Comparison with dust grain opacity models indicates the surface of the entire disk is populated with sub-micron grains. W...

Cocenters of $p$-adic groups, III: Elliptic and rigid cocenters

Ciubotaru, Dan; He, Xuhua (2017)
In this paper, we show that the elliptic cocenter of the Hecke algebra of a connected reductive group over a nonarchimedean local field is contained in the rigid cocenter. As applications, we prove the trace Paley-Wiener theorem and the abstract Selberg principle for mod-$l$ representations.

Relativistic anisotropic star and its maximum mass in higher dimensions

Paul, Bikash Chandra; Chattopadhyay, Pradip Kumar; Kamakar, Shibshankar (2014)
We present a class of relativistic solutions of cold compact anisotropic stars in hydrostatic equilibrium in the framework of higher dimensions using spheroidal geometry. The solutions obtained with Vaidya-Tikekar metric are used to construct stellar models of compact objects and studied their physical features. The effects of anisotropy and extra dimensions on the global properties namely, compactness, mass, radius, equation of state are determined in higher dimensions in terms of the sphero...

Magnetic metamaterials in the blue range using aluminum nanostructures

Jeyaram, Yogesh; Jha, Shankar K.; Agio, Mario; Löffler, Jörg F.; Ekinci, Yasin (2009)
We report an experimental and theoretical study of the optical properties of two-dimensional arrays of aluminum nanoparticle in-tandem pairs. Plasmon resonances and effective optical constants of these structures are investigated and strong magnetic response as well as negative permeability are observed down to 400 nm wavelength. Theoretical calculations based on the finite-difference time-domain method are performed for various particle dimensions and lattice parameters, and are found to be ...

Dynamics of the Bose-Einstein condensation: analogy with the collapse dynamics of a classical self-gravitating Brownian gas

Sopik, Julien; Sire, Clement; Chavanis, Pierre-Henri (2005)
We consider the dynamics of a gas of free bosons within a semi-classical Fokker-Planck equation for which we give a physical justification. In this context, we find a striking similarity between the Bose-Einstein condensation in the canonical ensemble, and the gravitational collapse of a gas of classical self-gravitating Brownian particles. The paper is mainly devoted to the complete study of the Bose-Einstein ``collapse'' within this model. We find that at the Bose-Einstein condensation temp...

Sociological and Communication-Theoretical Perspectives on the Commercialization of the Sciences

Leydesdorff, Loet (2011)
Both self-organization and organization are important for the further development of the sciences: the two dynamics condition and enable each other. Commercial and public considerations can interact and "interpenetrate" in historical organization; different codes of communication are then "recombined." However, self-organization in the symbolically generalized codes of communication can be expected to operate at the global level. The Triple Helix model allows for both a neo-institutional appr...

Constructing New Braided $T$-Categories via Weak Monoidal Hom-Hopf Algebras

Wang, Wei; Wang, Shuanhong; Zhang, Xiaohui (2015)
In this paper, we define and study weak monoidal Hom-Hopf algebras, which generalize both weak Hopf algebras and monoidal Hom-Hopf algebras. If $H$ is a weak monoidal Hom-Hopf algebra with bijective antipode and let $Aut_{wmHH}(H)$ be the set of all automorphisms of $H$. Then we introduce a category ${_{H}\mathcal{WMHYD}^{H}}(\alpha,\beta)$ with $\alpha,\beta\in Aut_{wmHH}(H)$ and construct a braided $T$-category $\mathcal{WMHYD}(H)$ that having all the categories ${_{H}\mathcal{WMHYD}^{H}}(\...

Critical Behavior at the Chiral Phase Transition

Bernard, C.; Blum, T.; DeTar, C. E.; Heller, U. M.; Gottlieb, S.; Hetrick, J. E.; Jegerlehner, Beat; Rummukainen, K.; Sugar, R. L.; Toussaint, D.; Wingate, M. (1997)
Quantum chromodynamics with two zero mass flavors is expected to exhibit a phase transition with O(4) critical behavior. Fixing the universality class is important for phenomenology and for facilitating the extrapolation of simulation data to physical quark mass values. At Lattice '96 the Tsukuba and Bielefeld groups reported results from new simulations with dynamical staggered quarks at $N_t = 4$, which suggested a departure from the expected critical behavior. We report observations of sim...

Maximum scattered $\mathbb{F}_q$-linear sets of $\mathrm{PG}(1,q^4)$

Csajbók, Bence; Zanella, Corrado (2017)
There are two known families of maximum scattered $\mathbb{F}_q$-linear sets in $PG(1,q^t)$: the linear sets of pseudoregulus type and for $t\geq 4$ the scattered linear sets found by Lunardon and Polverino. For $t=4$ we show that these are the only maximum scattered $\mathbb{F}_q$-linear sets and we describe the orbits of these linear sets under the groups $PGL(2,q^4)$ and $P\Gamma L(2,q^4)$.

Nielsen equivalence in a class of random groups

Kapovich, Ilya; Weidmann, Richard (2013)
We show that for every $n\ge 2$ there exists a torsion-free one-ended word-hyperbolic group $G$ of rank $n$ admitting generating $n$-tuples $(a_1,\ldots ,a_n)$ and $(b_1,\ldots ,b_n)$ such that the $(2n-1)$-tuples $$(a_1,\ldots ,a_n, \underbrace{1,\ldots ,1}_{n-1 \text{times}})\hbox{ and }(b_1,\ldots, b_n, \underbrace{1,\ldots ,1}_{n-1 \text{times}})$$ are not Nielsen-equivalent in $G$. The group $G$ is produced via a probabilistic construction.