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We investigate cosmological evolution and implications of cosmic strings with time-dependent tension. We derive basic equations of time development of the correlation length and the velocity of such strings, based on the one scale model.…

高能物理 - 唯象学 · 物理学 2008-11-26 Kazuhide Ichikawa , Tomo Takahashi , Masahide Yamaguchi

We discuss the obstacles for defining a set of observable quantities analogous to an S-matrix which are needed to formulate string theory in an accelerating universe. We show that the quintessence models with the equations of state $-1 < w…

高能物理 - 理论 · 物理学 2009-11-07 Simeon Hellerman , Nemanja Kaloper , Leonard Susskind

Networks in nature are often formed within a spatial domain in a dynamical manner, gaining links and nodes as they develop over time. We propose a class of spatially-based growing network models and investigate the relationship between the…

物理与社会 · 物理学 2013-12-30 Ari Zitin , Alex Gorowora , Shane Squires , Mark Herrera , Thomas M. Antonsen , Michelle Girvan , Edward Ott

We have developed different network approaches to complex patterns of frictional interfaces (contact areas developments). Here, we analyze the dynamics of static friction. We found, under the correlation measure, the fraction of triangles…

地球物理 · 物理学 2012-02-24 H. O. Ghaffari , R. P. Young

In AA collisions fusion and percolation of colour strings is studied at fixed rapidity $y$. Distribution of strings in rapidity is obtained from the observed rapidity spectra in pp collisions. For $y$-dependence of multiplicities in Au-Au…

高能物理 - 唯象学 · 物理学 2008-11-26 M. A. Braun , C. Pajares

The strong version of Maldacena's AdS/CFT conjecture implies that the large N expansion of free N=4 super-YM theory describes an interacting string theory in the extreme limit of high spacetime curvature relative to the string length.…

高能物理 - 理论 · 物理学 2010-02-03 Parviz Haggi-Mani , Bo Sundborg

In spite of its relevance to the origin of complex networks, the interplay between form and function and its role during network formation remains largely unexplored. While recent studies introduce dynamics by considering rewiring processes…

物理与社会 · 物理学 2008-07-18 J. Poncela , J. Gomez-Gardenes , L. M. Floria , A. Sanchez , Y. Moreno

We study a number of domain wall forming models where various types of defect junctions can exist. These illustrate some of the mechanisms that will determine the evolution of defect networks with junctions. Understanding these mechanisms…

高能物理 - 唯象学 · 物理学 2009-11-11 P. P. Avelino , C. J. A. P. Martins , J. Menezes , R. Menezes , J. C. R. E. Oliveira

This article is about my memories from the discovery that the Veneziano model describes in fact interacting strings. I came to the understanding of that the dual or Veneziano model is really a model of strings independently of L. Susskind…

高能物理 - 唯象学 · 物理学 2009-04-28 H. B. Nielsen

Network models with preferential attachment, where new nodes are injected into the network and form links with existing nodes proportional to their current connectivity, have been well studied for some time. Extensions have been introduced…

物理与社会 · 物理学 2013-06-26 James P. Bagrow , Dirk Brockmann

We propose and study a model of traffic in communication networks. The underlying network has a structure that is tunable between a scale-free growing network with preferential attachments and a random growing network. To model realistic…

网络与互联网体系结构 · 计算机科学 2008-06-12 Zonghua Liua , Weichuan Ma , Huan Zhang , Yin Sun , P. M. Hui

The collisions of cosmic strings loops and the dynamics of junctions formations in expanding backgrounds are studied. The key parameter controlling the dynamics of junctions formation, the cosmic strings zipping and unzipping is the…

高能物理 - 理论 · 物理学 2015-03-13 Hassan Firouzjahi , Salomeh Khoeini-Moghaddam , Shahram Khosravi

We continue our exploration of the wiggly generalisation of the Velocity-Dependent One Scale Model for cosmic strings, through the study of its allowed asymptotic scaling solutions. We extend the work of a previous paper [Almeida $\&$…

宇宙学与河外天体物理 · 物理学 2022-11-09 A. Almeida , C. J. A. P. Martins

We study the depinning transitions of elastic strings in disordered media in two different cases. We consider the elastic forces to be of infinite range in one case, where the magnitude is proportional to the extension of the string. The…

统计力学 · 物理学 2011-08-09 Soumyajyoti Biswas , Bikas K. Chakrabarti

Patterns and forms adopted by Nature, such as the shape of living cells, the geometry of shells and the branched structure of plants, are often the result of simple dynamical paradigms. Here we show that a growing self-interacting string…

软凝聚态物质 · 物理学 2009-11-11 D. Marenduzzo , T. X. Hoang , F. Seno , M. Vendruscolo , A. Maritan

Cascade models based on dynamical complex networks are proposed as models of turbulent energy cascade. Taking a simple shell model as the initial regular lattice with only nearest neighbor interactions, small world network models are…

流体动力学 · 物理学 2021-07-28 Özgür D. Gürcan

Quantitative studies of the evolution and cosmological consequences of networks of cosmic strings (or other topological defects) require a combination of numerical simulations and analytic modeling with the velocity-dependent one-scale…

宇宙学与河外天体物理 · 物理学 2020-08-19 J. R. C. C. C. Correia , C. J. A. P. Martins

The study of temporal networks in discrete time has yielded numerous insights into time-dependent networked systems in a wide variety of applications. For many complex systems, however, it is useful to develop continuous-time models of…

社会与信息网络 · 计算机科学 2021-02-10 Xinzhe Zuo , Mason A Porter

The existence of a scaling evolution for cosmic string loops in an expanding universe is demonstrated for the first time by means of numerical simulations. In contrast with what is usually assumed, this result does not rely on any…

天体物理学 · 物理学 2009-11-13 Christophe Ringeval , Mairi Sakellariadou , Francois Bouchet

Co-evolution exhibited by a network system, involving the intricate interplay between the dynamics of the network itself and the subsystems connected by it, is a key concept for understanding the self-organized, flexible nature of…

物理与社会 · 物理学 2012-11-14 Takaaki Aoki , Toshio Aoyagi
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