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- Ara Hayrapetyan, Éva Tardos, Tom Wexler
- Distributed Computing
- 2005

The success of the Internet is remarkable in light of the decentralized manner in which it is designed and operated. Unlike small scale networks, the Internet is built and controlled by a large number of disperate service providers who are not interested in any global optimization. Instead, providers simply seek to maximize their own profit by charging… (More)

- K Aamodt, A Abrahantes Quintana, +497 authors L Mangotra
- Physical review letters
- 2011

The centrality dependence of the charged-particle multiplicity density at midrapidity in Pb-Pb collisions at sqrt[s_{NN}]=2.76 TeV is presented. The charged-particle density normalized per participating nucleon pair increases by about a factor of 2 from peripheral (70%-80%) to central (0%-5%) collisions. The centrality dependence is found to be similar to… (More)

- K Aamodt, B Abelev, +497 authors G Løvhøiden
- Physical review letters
- 2010

The first measurement of the charged-particle multiplicity density at midrapidity in Pb-Pb collisions at a center-of-mass energy per nucleon pair √ S NN = 2.76 TeV is presented. For an event sample corresponding to the most central 5% of the hadronic cross section, the pseudorapidity density of primary charged particles at midrapidity is 1584 ± 4(stat) ±… (More)

- Ara Hayrapetyan, Éva Tardos, Tom Wexler
- STOC
- 2006

In this paper we initiate the study of how collusion alters the quality of solutions obtained in competitive games. The price of anarchy aims to measure the cost of the lack of coordination by comparing the quality of a Nash equilibrium to that of a centrally designed optimal solution. This notion assumes that players act not only selfishly, but also… (More)

- Ara Hayrapetyan, Chaitanya Swamy, Éva Tardos
- SODA
- 2005

We define a new class of network design problems motivated by designing information networks. In our model, the cost of transporting flow for a set of users (or servicing them by a facility) depends on the amount of <i>information</i> requested by the set of users. We assume that the aggregation cost follows economies of scale, that is, the incremental cost… (More)

- Ara Hayrapetyan, David Kempe, Martin Pál, Zoya Svitkina
- ESA
- 2005

We introduce the Minimum-size bounded-capacity cut (MinSBCC) problem, in which we are given a graph with an identified source and seek to find a cut minimizing the number of nodes on the source side, subject to the constraint that its capacity not exceed a prescribed bound B. Besides being of interest in the study of graph cuts, this problem arises in many… (More)

- K Aamodt, B Abelev, +497 authors G Løvhøiden
- Physical review letters
- 2010

We report the first measurement of charged particle elliptic flow in Pb-Pb collisions at sqrt[S(NN)] =2.76 TeV with the ALICE detector at the CERN Large Hadron Collider. The measurement is performed in the central pseudorapidity region (|η|<0.8) and transverse momentum range 0.2<p t<5.0 GeV/c. The elliptic flow signal v₂, measured using the 4-particle… (More)

- Rakesh M. Verma, Ara Hayrapetyan
- ACM Trans. Comput. Log.
- 2005

Programming language interpreters, proving equations (e.g. <i>x</i><sup>3</sup> = <i>x</i> implies the ring is Abelian), abstract data types, program transformation and optimization, and even computation itself (e.g., turing machine) can all be specified by a set of rules, called a rewrite system. Two fundamental properties of a rewrite system are the… (More)

- K Aamodt, N Abel, +497 authors A Kuryakin
- Physical review letters
- 2010

The ratio of the yields of antiprotons to protons in pp collisions has been measured by the ALICE experiment at sqrt[s]=0.9 and 7 TeV during the initial running periods of the Large Hadron Collider. The measurement covers the transverse momentum interval 0.45<p_{t}<1.05 GeV/c and rapidity |y|<0.5. The ratio is measured to be… (More)

- K Aamodt, B Abelev, +497 authors M Lunardon
- Physical review letters
- 2011

We report on the first measurement of the triangular v3, quadrangular v4, and pentagonal v5 charged particle flow in Pb-Pb collisions at sqrt(s(NN)) = 2.76 TeV measured with the ALICE detector at the CERN Large Hadron Collider. We show that the triangular flow can be described in terms of the initial spatial anisotropy and its fluctuations, which provides… (More)