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Virtual Time and Global States of Distributed Systems
 PARALLEL AND DISTRIBUTED ALGORITHMS
, 1988
"... A distributed system can be characterized by the fact that the global state is distributed and that a common time base does not exist. However, the notion of time is an important concept in every day life of our decentralized "real world" and helps to solve problems like getting a consiste ..."
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Cited by 741 (6 self)
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consistent population census or determining the potential causality between events. We argue that a linearly ordered structure of time is not (always) adequate for distributed systems and propose a generalized nonstandardmodel of time which consists of vectors of clocks. These clockvectors arepartially
StandardModel Bundles on NonSimply Connected . . .
, 2000
"... We give a proof of the existence of G = SU(5), stable holomorphic vector bundles on elliptically fibered Calabi–Yau threefolds with fundamental group Z2. The bundles we construct have Euler characteristic 3 and an anomaly that can be absorbed by Mtheory fivebranes. Such bundles provide the basis ..."
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Cited by 41 (20 self)
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We give a proof of the existence of G = SU(5), stable holomorphic vector bundles on elliptically fibered Calabi–Yau threefolds with fundamental group Z2. The bundles we construct have Euler characteristic 3 and an anomaly that can be absorbed by Mtheory fivebranes. Such bundles provide the basis for constructing the standard model in heterotic Mtheory. They are also applicable to vacua of the weakly coupled heterotic string. We
Noncommutative compactifications of type I strings on tori with magnetic background flux
 JHEP 0010 (2000) 006, hepth/0007024; “Magnetic Flux in Toroidal Type I Compactification”, Fortsch. Phys. 49 (2001) 591, hepth/0010198
"... We construct six and fourdimensional toroidal compactifications of the Type I string with magnetic flux on the Dbranes. The open strings in this background probe a noncommutative internal geometry. Phenomenologically appealing features such as chiral fermions and supersymmetry breaking in the gau ..."
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Cited by 148 (23 self)
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We construct six and fourdimensional toroidal compactifications of the Type I string with magnetic flux on the Dbranes. The open strings in this background probe a noncommutative internal geometry. Phenomenologically appealing features such as chiral fermions and supersymmetry breaking in the gauge sector are naturally realized by these vacua. We investigate the spectra of such noncommutative string compactifications and in a bottomup approach discuss the possibility to obtain the standard or some GUT like model.
Practical identitybased encryption without random oracles
 of LNCS
"... Abstract. We present an Identity Based Encryption (IBE) system that is fully secure in the standard model and has several advantages over previous such systems – namely, computational efficiency, shorter public parameters, and a “tight ” security reduction, albeit to a stronger assumption that depen ..."
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Cited by 139 (2 self)
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Abstract. We present an Identity Based Encryption (IBE) system that is fully secure in the standard model and has several advantages over previous such systems – namely, computational efficiency, shorter public parameters, and a “tight ” security reduction, albeit to a stronger assumption that depends on the number of private key generation queries made by the adversary. Our assumption is a variant of Boneh et al.’s decisional Bilinear DiffieHellman Exponent assumption, which has been used to construct efficient hierarchical IBE and broadcast encryption systems. The construction is remarkably simple. It also provides recipient anonymity automatically, providing a second (and more efficient) solution to the problem of achieving anonymous IBE without random oracles. Finally, our proof of CCA2 security, which has more in common with the security proof for the CramerShoup encryption scheme than with security proofs for other IBE systems, may be of independent interest.
An Uninstantiable RandomOracleModel Scheme for a HybridEncryption Problem,” Full version of this paper. Available at http://wwwcse.ucsd.edu/users/mihir
"... Abstract. We present a simple, natural randomoracle (RO) model scheme, for a practical goal, that is uninstantiable, meaning is proven in the RO model to meet its goal yet admits no standardmodel instantiation that meets this goal. The goal in question is INDCCApreserving asymmetric encryption w ..."
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Cited by 96 (5 self)
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Abstract. We present a simple, natural randomoracle (RO) model scheme, for a practical goal, that is uninstantiable, meaning is proven in the RO model to meet its goal yet admits no standardmodel instantiation that meets this goal. The goal in question is INDCCApreserving asymmetric encryption
Solar system abundances and condensation temperatures of the elements
 ApJ
"... Solar photospheric and meteoritic CI chondrite abundance determinations for all elements are summarized and the best currently available photospheric abundances are selected. The meteoritic and solar abundances of a few elements (e.g., noble gases, beryllium, boron, phosphorous, sulfur) are discusse ..."
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Cited by 100 (0 self)
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Solar photospheric and meteoritic CI chondrite abundance determinations for all elements are summarized and the best currently available photospheric abundances are selected. The meteoritic and solar abundances of a few elements (e.g., noble gases, beryllium, boron, phosphorous, sulfur) are discussed in detail. The photospheric abundances give mass fractions of hydrogen (X 0:7491), helium (Y 0:2377), and heavy elements (Z 0:0133), leading to Z=X 0:0177, which is lower than the widely used Z=X 0:0245 from previous compilations. Recent results from standard solar models considering helium and heavyelement settling imply that photospheric abundances and mass fractions are not equal to protosolar abundances (representative of solar system abundances). Protosolar elemental and isotopic abundances are derived from photospheric abundances by considering settling effects. Derived protosolar mass fractions are X0 0:7110, Y0 0:2741, and Z0 0:0149. The solar system and photospheric abundance tables are used to compute selfconsistent sets of condensation temperatures for all elements. Subject headings: astrochemistry — meteors, meteoroids — solar system: formation — Sun: abundances — Sun: photosphere 1.
The inflationary braneantibrane universe
 JHEP
"... We show how the motion through the extra dimensions of a gas of branes and antibranes can, under certain circumstances, produce an era of inflation as seen by observers trapped on a 3brane, with the inflaton being the interbrane separation. Although most of our discussion refers to arbitrary pbra ..."
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Cited by 93 (15 self)
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We show how the motion through the extra dimensions of a gas of branes and antibranes can, under certain circumstances, produce an era of inflation as seen by observers trapped on a 3brane, with the inflaton being the interbrane separation. Although most of our discussion refers to arbitrary pbranes, when we need to be specific we assume that they are Dbranes of Type II or Type I string theory. For realistic brane couplings, such as those arising in string theory, the interbrane potentials are too steep to inflate the universe for acceptably long times. However, for special regions of the parameter space of braneantibrane positions the brane motion is slow enough for there to be sufficient inflation. Inflation would be more generic in models where the interbrane interactions are much weaker. The spectrum of primordial density fluctuations predicted has index n slightly less than 1, and an acceptable amplitude, provided that the extra dimensions have linear size 1/r ∼ 10 12 GeV. Reheating occurs as in hybrid inflation, with the tachyonic instability of the braneantibrane system taking over for small separations. The tachyon field can induce a cascade mechanism
A theory of object recognition: computations and circuits in the feedforward path of the ventral stream in primate visual cortex
, 2005
"... ..."
General Analysis of New Physics in ...
, 2001
"... We present a modelindependent parametrization of the B ! J= K , B d ! J= K S decay amplitudes by taking into account the constraints that are implied by the isospin symmetry of strong interactions. Employing estimates borrowed from eective eld theory, we explore the impact of physics beyond t ..."
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Cited by 2 (0 self)
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the Standard Model and introduce { in addition to the usual mixinginduced CP asymmetry A mix CP in B d ! J= K S { a set of three observables, allowing a general analysis of possible newphysics eects in the B ! J= K system. Imposing a dynamical hierarchy of amplitudes, we argue that one of these observables
MultiPropertyPreserving Hash Domain Extension and the EMD Transform
 Advances in Cryptology – ASIACRYPT 2006
, 2006
"... Abstract We point out that the seemingly strong pseudorandom oracle preserving (PROPr) propertyof hash function domainextension transforms defined and implemented by Coron et. al. [12] can actually weaken our guarantees on the hash function, in particular producing a hash functionthat fails to be ..."
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Cited by 70 (8 self)
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to be even collisionresistant (CR) even though the compression function to which the transform is applied is CR. Not only is this true in general, but we show that all the transformspresented in [12] have this weakness. We suggest that the appropriate goal of a domain extension transform for the next
Results 1  10
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2,236