Exploring an S-matrix for gravitational collapse II: a momentum space analysis (2008)
Veneziano, Gabriele, Wosiek, J
We complement our earlier position-space exploration of a recently proposed S-matrix for transplanckian scattering by a momentum-space analysis. As in the previous paper, we restrict ourselves to the...
Exploring an S-matrix for gravitational collapse (2008)
Veneziano, Gabriele, Wosiek, J
We analyze further a recently proposed S-matrix description of transplanckian scattering in the specific case of axisymmetric collisions of extended sources, where some of the original approximations...
Towards an S-matrix description of gravitational collapse (2008)
Amati, Daniele, Ciafaloni, Marcello, Veneziano, Gabriele
Extending our previous results on trans-Planckian ($Gs \gg \hbar$) scattering of light particles in quantum string-gravity we present a calculation of the corresponding S-matrix from the region of...
Towards an S-matrix Description of Gravitational Collapse (2007)
Amati, D, Ciafaloni, M, Veneziano, Gabriele
Extending our previous results on trans-Planckian ($Gs \gg \hbar$) scattering of light particles in quantum string-gravity we present a calculation of the corresponding S-matrix from the region of...
String Theory and Pre-big bang Cosmology (2007)
Gasperini, M, Veneziano, Gabriele
In string theory, the traditional picture of a Universe that emerges from the inflation of a very small and highly curved space-time patch is a possibility, not a necessity: quite different initial...
A note on C-Parity Conservation and the Validity of Orientifold Planar Equivalence (2007)
Armoni, A, Shifman, M, Veneziano, Gabriele
We analyze the possibility of a spontaneous breaking of C-invariance in gauge theories with fermions in vector-like - but otherwise generic - representations of the gauge group. QCD, supersymmetric...
A note on C-Parity Conservation and the Validity of Orientifold Planar Equivalence (2007)
Armoni, Adi, Shifman, Mikhail, Veneziano, Gabriele
We analyze the possibility of a spontaneous breaking of C-invariance in gauge theories with fermions in vector-like - but otherwise generic - representations of the gauge group. QCD, supersymmetric...
A supersymmetric matrix model: III. Hidden SUSY in statistical systems (2006)
Veneziano, Gabriele, Wosiek, J
The Hamiltonian of a recently proposed supersymmetric matrix model has been shown to become block-diagonal in the large-N, infinite 't Hooft coupling limit. We show that (most of) these blocks can be...
A supersymmetric matrix model: II. Exploring higher-fermion-number sectors (2006)
Veneziano, Gabriele, Wosiek, J
Continuing our previous analysis of a supersymmetric quantum-mechanical matrix model, we study in detail the properties of its sectors with fermion number F=2 and 3. We confirm all previous...
Supersymmetry and Combinatorics (2006)
Onofri, E, Veneziano, Gabriele, Wosiek, J
We show how a recently proposed supersymmetric quantum mechanics model leads to non-trivial results/conjectures on the combinatorics of binary necklaces and linear-feedback shift-registers. Fermi...
Large N, Supersymmetry ... and QCD (2006)
Veneziano, Gabriele, Wosiek, J
This paper consists of two (still only vaguely) related parts: in the first, we briefly review work done in the past three years on the ``planar equivalence" between a class of non-supersymmetric...
Planar Quantum Mechanics: an Intriguing Supersymmetric Example (2005)
Veneziano, Gabriele, Wosiek, J
After setting up a Hamiltonian formulation of planar (matrix) quantum mechanics, we illustrate its effectiveness in a non-trivial supersymmetric example. The numerical and analytical study of two...
Quark Condensate in Massless QCD from Planar Equivalence (2005)
Armoni, A, Shore, G, Veneziano, Gabriele
A previous estimate of the quark condensate in one-flavour massless QCD from the known value of the gluino condensate in super Yang-Mills (SYM) theory is extended to Nf >1 by considering the large-N...
The Bose-Einstein effect and the jet structure of hadronic final states (2005)
Giovannini, Alberto, Veneziano, Gabriele
The authors argue that effects of Bose-Einstein statistics on two- and possibly three-pion correlations can provide a sensitive test of the mechanism through which hadronic final states come out in a...
A possible description of baryon dynamics in dual and gauge theories (2005)
Rossi, G C, Veneziano, Gabriele
The authors generalize to baryons a framework recently proposed in order to unify gauge, dual and Regge-Gribov theories of mesons. They depart from the 1/N/sub colour/ expansion of quantum...
Unitarity sum rules and the two-Reggeon cut (2005)
Using (s-channel) unitarity sum rules, consistency requirements on the two-reggeon cut are derived. A consistent solution with the (negative) absorptive sign of the cut is found and its magnitude...
String Theory: has Einstein's dream come true? (2005)
After having outlined the difficulties that Einstein and others have encountered in trying to unify our understanding of macroscopic/classical and microscopic /quantum physics, I will explain in...
Regular two-component bouncing cosmologies and perturbations therein (2005)
We present a full investigation of scalar perturbations in a rather generic model for a regular bouncing universe, where the bounce is triggered by an effective perfect fluid with negative energy...
Scalar perturbations in regular two-component bouncing cosmologies (2005)
We consider a two-component regular cosmology bouncing from contraction to expansion, where, in order to include both scalar fields and perfect fluids as particular cases, the dominant component is...
Refining the Proof of Planar Equivalence (2004)
Armoni, A, Shifman, M, Veneziano, Gabriele
We outline a full non-perturbative proof of planar (large-N) equivalence between bosonic correlators in a theory with Majorana fermions in the adjoint representation and one with Dirac fermions in...
String-theoretic unitary S-matrix at the threshold of black-hole production (2004)
Previous results on trans-Planckian collisions in superstring theory are rewritten in terms of an explicitly unitary S-matrix whose validity covers a large region of the energy/impact-parameter...
Fifty years of research at CERN: from past to future (2004)
Hübner, Kurt, Veneziano, Gabriele, Treille, Daniel, Williams, David Owen, Giudice, Gian Francesco
Isospin Mixing of Narrow Pentaquark States (2004)
Rossi, G C, Veneziano, Gabriele
Interpreting the recently discovered narrow exotic baryons as pentaquark states, we discuss, along an old argument of ours, the isospin mixing occurring within the two doublets of $Q = -1$ and Q=0...
From Super-Yang-Mills Theory to QCD: Planar Equivalence and its Implications (2004)
Armoni, Adi, Shifman, M, Veneziano, Gabriele
We review and extend our recent work on the planar (large N) equivalence between gauge theories with varying degree of supersymmetry. The main emphasis is made on the planar equivalence between N=1...
Cosmological perturbations across a curvature bounce (2004)
Gasperini, M, Giovannini, Massimo, Veneziano, Gabriele
String-inspired cosmologies, whereby a non-singular curvature bounce is induced by a general-covariant, $T$-duality-invariant, non-local dilaton potential, are used to study numerically how...
A Model for the Big Bounce (2003)
I motivate a proposal for modeling, at weak string coupling, the ``Big Bounce" transition from a growing-curvature phase to standard (FRW) cosmology in terms of a pressure-less dense gas of...
Dreams of a finite theory (2003)
1. Should we be happy with quantum field theory? 2. Quantum string magic. 3. A new superstring-inspired cosmology.
The Price of an Exact, Gauge-Invariant RG-Flow Equation (2003)
Meissner, K A, Branchina, V, Veneziano, Gabriele
We combine old ideas about exact renormalization-group-flow (RGF) equations with the Vilkovisky-De Witt (VDW) approach to reparametrization invariant effective actions and arrive at a new, exact,...
QCD Quark Condensate from SUSY and the Orientifold Large-N Expansion (2003)
Armoni, Adi, Shifman, M, Veneziano, Gabriele
We estimate the quark condensate in one-flavor massless QCD from the known value of the gluino condensate in SUSY Yang-Mills theory using our newly proposed "orientifold" large-N expansion. The...
SUSY Relics in One-Flavor QCD from a New 1/N Expansion (2003)
Armoni, Adi, Shifman, M, Veneziano, Gabriele
We suggest a new large-N_c limit for multi flavor QCD. Since fundamental and two-index antisymmetric representations are equivalent in SU(3), we have the option to define SU(N_c) QCD keeping quarks...
Perturbations in a non-singular bouncing Universe (2003)
Gasperini, M, Giovannini, Massimo, Veneziano, Gabriele
We complement the low-energy gravi-dilaton effective action of string theory with a non-local, general-covariant dilaton potential, and obtain homogeneous solutions describing a non-singular...
Cosmological Perturbations from a New-Physics Hypersurface (2003)
Bozza, Valerio, Giovannini, Massimo, Veneziano, Gabriele
Within a broad class of inflationary models we critically analyze the way initial quantum fluctuations on a new-physics hypersurface (NPH) affect standard predictions for large-scale cosmological...
Exact Results in Non-Supersymmetric Large N Orientifold Field Theories (2003)
Armoni, Adi, Shifman, M, Veneziano, Gabriele
We consider non-supersymmetric large N orientifold field theories. Specifically, we discuss a gauge theory with a Dirac fermion in the anti-symmetric tensor representation. We argue that, at large N...
Constraints on pre-big bang parameter space from CMBR anisotropies (2002)
Bozza, Valerio, Gasperini, M, Giovannini, Massimo, Veneziano, Gabriele
The so-called curvaton mechanism --a way to convert isocurvature perturbations into adiabatic ones-- is investigated both analytically and numerically in a pre-big bang scenario where the role of the...
The Pre-Big Bang Scenario in String Cosmology (2002)
Gasperini, M, Veneziano, Gabriele
We review physical motivations, phenomenological consequences, and open problems of the so-called pre-big bang scenario in superstring cosmology.
Cosmology without a beginning (2002)
Most of the puzzles with standard big bang cosmology can be avoided if the big bang is NOT identified with the beginning of time. The short-distance cutoff and duality symmetries of superstring...
Assisting pre-big bang phenomenology through short-lived axions (2002)
Bozza, Valerio, Gasperini, M, Giovannini, Massimo, Veneziano, Gabriele
We present the results of a detailed study of how isocurvature axion fluctuations are converted into adiabatic metric perturbations through axion decay, and discuss the constraints on the parameters...
Violations of the equivalence principle in a dilaton-runaway scenario (2002)
Piazza, F, Veneziano, Gabriele
We explore a version of the cosmological dilaton-fixing and decoupling mechanism in which the dilaton-dependence of the low-energy effective action is extremized for infinitely large values of the...
Runaway dilaton and equivalence principle violations (2002)
Piazza, F, Veneziano, Gabriele
In a recently proposed scenario, where the dilaton decouples while cosmologically attracted towards infinite bare string coupling, its residual interactions can be related to the amplitude of density...
Black holes from high-energy beam--beam collisions (2002)
Kohlprath, Emmanuel, Veneziano, Gabriele
Using a recent technique, proposed by Eardley and Giddings, we extend their results to the high-energy collision of two beams of massless particles, i.e. of two finite-front shock waves. Closed...
Trialogue on the number of fundamental constants (2002)
Duff, Michael J., Okun, Lev B., Veneziano, Gabriele
This paper consists of three separate articles on the number of fundamental dimensionful constants in physics. We started our debate in summer 1992 on the terrace of the famous CERN cafeteria. In the...
Scalar fluctuations in dilatonic brane-worlds (2001)
Bozza, Valerio, Gasperini, M, Veneziano, Gabriele
We derive and solve the full set of scalar perturbation equations for a class of five-dimensional brane--world solutions, with a dilaton scalar field coupled to the bulk cosmological constant and to...
Trialogue on the number of fundamental constants (2001)
Duff, Michael J, Okun, Lev Borisovich, Veneziano, Gabriele
This paper consists of three separate articles on the number of fundamental dimensionful constants in physics. We started our debate in summer 1992 on the terrace of the famous CERN cafeteria. In the...
Large-N bounds on, and compositeness limit of, gauge and gravitational interactions (2001)
In a toy model of gauge and gravitational interactions in $D \ge 4$ dimensions, endowed with an invariant UV cut-off $\Lambda$, and containing a large number $N$ of non-self-interacting matter...
The Ua(1) Problem On The Lattice With Ginsparg-wilson Fermions (2001)
Giusti, Leonardo, Rossi, G C, Testa, M, Veneziano, Gabriele
We show how it is possible to give a precise and unambiguous implementation of the Witten--Veneziano formula for the eta' mass on the lattice, which looks like the formal continuum one, if the...
Quintessence as a run-away dilaton (2001)
Gasperini, M, Piazza, F, Veneziano, Gabriele
We consider a late-time cosmological model based on a recent proposal that the infinite-bare-coupling limit of superstring/M-theory exists and has good phenomenological properties, including a...
Localization of Scalar Fluctuations in a Dilatonic Brane-World Scenario (2001)
Bozza, Valerio, Gasperini, M, Veneziano, Gabriele
We derive and solve the full set of scalar perturbation equations for a class of $Z_2$-symmetric five-dimensional geometries generated by a bulk cosmological constant and by a 3-brane non-minimally...
CFT, Holography, and Causal Entropy Bound (2001)
Brustein, Ram, Foffa, Stefano, Veneziano, Gabriele
The causal entropy bound (CEB) is confronted with recent explicit entropy calculations in weakly and strongly coupled conformal field theories (CFTs) in arbitrary dimension $D$. For CFT's with a...
An evolving look at Pomeranchuk scattering (2000)
The evolving way in which high-energy, small-momentum-transfer processes have been described over the past 30 years is briefly reviewed.
O(d,d)-invariant collapse/inflation from colliding superstring waves (2000)
Bozza, Valerio, Veneziano, Gabriele
Generalizing previous work, we study the collision of massless superstring plane waves in D space-time dimensions within an explicitly O(D-2,D-2)-invariant set of field equations. We discuss some...
String Cosmology: The Pre-Big Bang Scenario (2000)
A review is attempted of physical motivations, theoretical andphenomenological aspects, as well as outstanding problems, of the pre-big bangscenario in string cosmology.
Pre-Big Bang Cosmology and Quantum Fluctuations (2000)
Ghosh, A, Pollifrone, G, Veneziano, Gabriele
The quantum fluctuations of a homogeneous, isotropic, open pre-big bang model are discussed. By solving exactly the equations for tensor and scalar perturbations we find that particle production is...
Brustein, Ram, Veneziano, Gabriele
The identification of a causal-connection scale motivates us to propose a new covariant bound on entropy within a generic space-like region. This "causal entropy bound", scaling as the square root of...
Back-Reaction to Dilaton-Driven Inflation (1999)
Ghosh, A, Madden, R, Veneziano, Gabriele
We compute the leading-order back-reaction to dilaton-driven inflation, due to graviton, dilaton and gauge-boson production. The one-loop effect turns out to be non-vanishing (unlike the case for...
Pre-big bang cosmology: end of a myth? (1999)
The myth according to which the Universe-and time itself-started with /near a big bang singularity is questioned. Superstring theory, through its duality symmetries, favours a pre- (rather than a...
Self-gravitating fundamental strings and black-holes (1999)
The configuration of typical highly excited (M >> M_s ~ (alpha')^{-1/2}) string states is considered as the string coupling g is adiabatically increased. The size distribution of very massive single...
Entropy Bounds and String Cosmology (1999)
After discussing some old (and not-so-old) entropy bounds both for isolated systems and in cosmology, I will argue in favour of a "Hubble entropy bound" holding in the latter context. I will then...
Cosmic Microwave Background anisotropies and extra dimensions in String Cosmology (1999)
Melchiorri, A, Vernizzi, F, Durrer, R, Veneziano, Gabriele
A recently proposed mechanism for large-scale structure in string cosmology --based on massless axionic seeds-- is further analyzed and extended to the acoustic-peak region. Existence, structure, and...
Pre-bangian origin of our entropy and time arrow (1999)
I argue that, in the chaotic version of string cosmology proposed recently, classical and quantum effects generate, at the time of exit to radiation, the correct amount of entropy to saturate a...
Inflating, Warming Up and Probing the Pre-Bangian Universe (1999)
Classical and quantum gravitational instabilities, can, respectively, inflate and warm up a primordial Universe satisfying a superstring-motivated principle of "Asymptotic Past Triviality". A...
Topological Charge Screening and the "Proton Spin" Beyond the Chiral Limit (1998)
Narison, Stéphan, Shore, Graham M, Veneziano, Gabriele
The theory of the `proton spin' effect proposed in our earlier papers is extended to include the chiral SU(3) symmetry breaking and flavour mixing induced by non-vanishing quark masses in QCD. The...
Quantum Fluctuations in Open Pre-Big Bang Cosmology (1998)
Ghosh, A, Pollifrone, G, Veneziano, Gabriele
We solve exactly the (linear-order) equations for tensor and scalar perturbations over the homogeneous, isotropic, open pre-big bang model recently discussed by several authors. We find that, in...
Pre-big bang bubbles from the gravitational instability of generic string vacua (1998)
Buonanno, A, Veneziano, Gabriele
We formulate the basic postulate of pre-big bang cosmology as one of ``asymptotic past triviality'', by which we mean that the initial state is a generic perturbative solution of the tree-level...
Gasperini, M, Veneziano, Gabriele
We discuss the conditions under which pre-big bang models can fit the observed large-scale anisotropy with a primordial spectrum of massive (Kalb--Ramond) axion fluctuations. The primordial spectrum...
Massless (pseudo-)scalar seeds of CMB anisotropy (1998)
Durrer, R, Gasperini, M, Sakellariadou, M, Veneziano, Gabriele
A primordial stochastic background of very weakly coupled massless (pseudo-)scalars can seed CMB anisotropy, when large-scale fluctuations of their stress-tensor re-enter the horizon during the...
Seeds of large-scale anisotropy in string cosmology (1998)
Durrer, R, Gasperini, M, Sakellariadou, M, Veneziano, Gabriele
Pre-big bang cosmology predicts tiny first-order dilaton and metric perturbations at very large scales. Here we discuss the possibility that other -- more copiously generated -- perturbations may...
Unitarity in dual resonance models (1998)
Di Giacomo, Adriano, Fubini, Sergio P, Sertorio, L, Veneziano, Gabriele
Duality in cosmological perturbation theory (1998)
Brustein, Ram, Gasperini, M, Veneziano, Gabriele
Cosmological perturbation equations derived from low-energy effective actions are shown to be invariant under a duality transformation reminiscent of electric-magnetic, strong-weak coupling,...
Compositeness as a clue for the understanding of the asymptotic behaviour of form factors (1998)
Amati, Daniele, Jengo, R, Rubinstein, H R, Veneziano, Gabriele, Virasoro, Miguel Angel
A Simple/Short Introduction to Pre-Big-Bang Physics/Cosmology (1998)
A simple, non-technical introduction to the pre-big bang scenario is given, emphasizing physical motivations, considerations, and consequences over formalism.
A numerical simulation of pre-big bang cosmology (1998)
Maharana, J P, Onofri, E, Veneziano, Gabriele
We analyse numerically the onset of pre-big bang inflation in an inhomogeneous, spherically symmetric Universe. Adding a small dilatonic perturbation to a trivial (Milne) background, we find that...
De Florian, D, Shore, Graham M, Veneziano, Gabriele
Topological charge screening has been proposed as the mechanism responsible for the anomalous suppression in the first moment of the polarized proton structure function -- the `proton spin' effect....
Quantum Inhomogeneities in String Cosmology (1997)
Buonanno, A, Meissner, K A, Ungarelli, C, Veneziano, Gabriele
Within two specific string cosmology scenarios --differing in the way the pre- and post-big bang phases are joined-- we compute the size and spectral slope of various types of cosmologically...
Fracture functions from cut vertices (1997)
Grazzini, Massimiliano, Trentadue, L G, Veneziano, Gabriele
Using a generalized cut vertex expansion we introduce the concept of an extended fracture function for the description of semi-inclusive deep inelastic processes in the target fragmentation region....
Shore, Graham M, Veneziano, Gabriele
A natural consequence of the composite operator propagator-vertex description of deep inelastic scattering developed by the authors is that the anomalous suppression observed in the flavour singlet...
Dreams of a finite theory (1997)
Our present understanding of fundamental interactions is based on quantum field theory and general relativity.In spite of their respective striking successes,both frameworks suffer from conceptual...
Classical Inhomogeneities in String Cosmology (1997)
Buonanno, A, Meissner, K A, Ungarelli, C, Veneziano, Gabriele
We generalize previous work on inhomogeneous pre-big bang cosmology by including the effect of non-trivial moduli and antisymmetric-tensor/axion fields. The general quasi-homogeneous asymptotic...
Inhomogeneous Pre-Big Bang String Cosmology (1997)
An inhomogeneous version of Pre--Big Bang cosmology emerges, within string theory, from quite generic initial conditions, provided they lie deeply inside the weak-coupling, low-curvature regime....
Towards a non-singular pre-Big Bang cosmology (1996)
Gasperini, M, Maggiore, Michele, Veneziano, Gabriele
We discuss general features of the $\beta$-function equations for spatially flat, $(d+1)$-dimensional cosmological backgrounds at lowest order in the string-loop expansion, but to all orders in...
Singularity and exit problems in two-dimensional string cosmology (1996)
Gasperini, M, Veneziano, Gabriele
A broad class of two-dimensional loop-corrected dilaton gravity models exhibit cosmological solutions that interpolate between the string perturbative vacuum and a background with asymptotically flat...
String cosmology and relic gravitational radiaton (1996)
String theory counterparts to Einstein's gravity, cosmology and inflation are described. A very tight upper bound on the Cosmic Gravitational Radiation Background (CGRB) of standard inflation is...
Peak and end point of the relic graviton background in string cosmology (1996)
Brustein, Ram, Gasperini, M, Veneziano, Gabriele
Using general arguments we determine the allowed region for the end point frequency and the peak energy density of the stochastic background of gravity waves expected in string cosmology. We provide...
Graceful exit in quantum string cosmology (1996)
Gasperini, M, Maharana, J P, Veneziano, Gabriele
We write an O(d,d)-covariant Wheeler-De Witt equation in the (d^2+1)-dimensional minisuperspace of low-energy cosmological string backgrounds. We discuss explicit examples of transitions between two...
Birth of the universe as quantum scattering in string cosmology (1996)
Gasperini, M, Veneziano, Gabriele
In a Wheeler-de Witt approach to quantum string cosmology, the present state of the Universe arises from the scattering and reflection of the wave function representing the initial string vacuum in...
String cosmology: concepts and consequences (1995)
After recalling a few basic concepts from cosmology and string theory, I will discuss the main ideas/assumptions underlying string cosmology and show how these lead to a two-parameter family of...
Gravitational radiation from string cosmology (1995)
Brustein, Ram, Gasperini, M, Giovannini, Massimo, Veneziano, Gabriele
A spectrum of relic stochastic gravitational radiation, strongly tilted towards high frequencies, and characterized by two basic parameters is shown to emerge in a class of string theory models. We...
String cosmology: basic ideas and general results (1995)
After recalling a few basic concepts from cosmology and string theory, I will outline the main ideas/assumptions underlying (our own group's approach to) string cosmology and show how these lead to...
Estimating diffractive Higgs boson production at LHC from HERA data (1995)
Graudenz, Dirk, Veneziano, Gabriele
Using a recently proposed factorization hypothesis for semi-inclusive hard processes in QCD, one can study, in principle, the diffractive production of the Standard Model Higgs boson at LHC using...
Relic gravitational waves from string cosmology (1995)
Brustein, Ram, Gasperini, M, Giovannini, Massimo, Veneziano, Gabriele
A large class of string-cosmology backgrounds leads to a spectrum of relic stochastic gravitational waves, strongly tilted towards high frequencies, and characterized by two basic parameters of the...
Electromagnetic origin of the CMB anisotropy in string cosmology (1995)
Gasperini, M, Giovannini, Massimo, Veneziano, Gabriele
In the inflationary scenarios suggested by string theory, the vacuum fluctuations of the electromagnetic field can be amplified by the time-evolution of the dilaton background, and can grow large...
Primordial magnetic fields from string cosmology (1995)
Gasperini, M, Giovannini, Massimo, Veneziano, Gabriele
Sufficiently large seeds for generating the observed (inter)galactic magnetic fields emerge naturally in string cosmology from the amplification of electromagnetic vacuum fluctuations due to a...
Evolution of a string network in backgrounds with rolling horizons (1995)
Gasperini, M, Giovannini, Massimo, Meissner, K A, Veneziano, Gabriele
We discuss the temporal variation of the equation of state of a classical string network, evolving in a background in which the Hubble radius 1/H shrinks to a minimum and then re-expands to infinity....
Metric perturbations in dilaton-driven inflation (1995)
Brustein, Ram, Gasperini, M, Giovannini, Massimo, Mukhanov, V F, Veneziano, Gabriele
We compute the spectrum of scalar and tensor metric perturbations generated, as amplified vacuum fluctuations, during an epoch of dilaton-driven inflation of the type occurring naturally in string...
String Cosmology: Concepts and Consequences (1995)
After recalling a few basic concepts from cosmology and string theory, I will discuss the main ideas/assumptions underlying string cosmology and show how these lead to a two-parameter family of...
String Cosmology: Concepts and Consequences (1995)
After recalling a few basic concepts from cosmology and string theory, I will discuss the main ideas/assumptions underlying string cosmology and show how these lead to a two-parameter family of...
Remarks on non-abelian duality (1994)
Elitzur, Shmuel, Giveon, Amit, Rabinovici, Eliezer, Schwimmer, A, Veneziano, Gabriele
A class of two-dimensional globally scale-invariant, but not conformally invariant, theories is obtained. These systems are identified in the process of discussing global and local scaling properties...
Target independence of the EMC-SMC effect (1994)
Narison, Stéphan, Shore, Graham M, Veneziano, Gabriele
\noindent{\bf Abstract} \vskip0.2cm \noindent An approach to deep inelastic scattering is described in which the matrix elements arising from the operator product expansion are factorised into...
Dilaton production in string cosmology (1994)
Gasperini, M, Veneziano, Gabriele
We consider the coupled evolution of density, (scalar) metric and dilaton perturbations in the transition from a "stringy" phase of growing curvature and gravitational coupling to the standard...
The graceful exit problem in string cosmology (1994)
Brustein, Ram, Veneziano, Gabriele
Isotropic string cosmology solutions can be classified into two duality related branches: one can be connected smoothly to an expanding Friedman-Robertson-Walker Universe, the other describes...
Planckian energy scattering and surface terms in the gravitational action (1993)
Fabbrichesi, Marco E, Pettorino, R, Veneziano, Gabriele, Vilkovisky, G A
Squeezed thermal vacuum and the maximum scale for inflation (1993)
Gasperini, M, Giovannini, Massimo, Veneziano, Gabriele
We consider the stimulated emission of gravitons from an initial state of thermal equilibrium, under the action of the cosmic gravitational background field. We find that the low-energy graviton...
Pre-big-bang in string cosmology (1992)
Gasperini, M, Veneziano, Gabriele
The duality-type symmetries of string cosmology naturally lead to a pre-big-bang phase of accelerated evolution as dual counterpart of the decelerated expansion of standard cosmology. We discuss...
Boosting away singularities from conformal string backgrounds (1992)
Gasperini, M, Maharana, J, Veneziano, Gabriele
Generalizing our previous work, we show how $O(d,d)$ transformations can be used to "boost away" in new dimensions the physical singularities that occur generically in cosmological and/or black-hole...
Duality and supersymmetry breaking in string theory (1990)
Ferrara, Sergio, Magnoli, N, Taylor, T R, Veneziano, Gabriele
The spectrum of a class of supersymmetric theories with false vacua (1990)
Karsch, Frithjof, Rabinovici, Eliezer, Shore, Graham M, Veneziano, Gabriele
An attempt at realistic supercompositeness (1990)
Masiero, A, Pettorino, R, Roncadelli, Marco, Veneziano, Gabriele
Quantum constraint algebra for an interacting superstring (1990)
Fubini, Sergio P, Maharana, J P, Roncadelli, Marco, Veneziano, Gabriele
Stochastic identities in quantum theory (1990)
D'Alfaro, V, Fubini, Sergio P, Furlan, G, Veneziano, Gabriele
Stochastic identities in supersymmetric theories (1990)
D'Alfaro, V, Fubini, Sergio P, Furlan, G, Veneziano, Gabriele
Chiral estimate of the electric dipole moment of the neutron in quantum chromodynamics (1990)
Crewther, R J, Di Vecchia, P, Veneziano, Gabriele, Witten, Edward
Large N, chiral approach to pseudoscalar masses, mixings and decays (1990)
Di Vecchia, P, Nicodemi, F, Pettorino, R, Veneziano, Gabriele
Dynamical gauge bosons from fundamental fermions (1990)
Amati, Daniele, Barbieri, Riccardo, Davis, A C, Veneziano, Gabriele
Preliminary evidence for U$_{A}$(1) breaking in QCD from lattice calculations (1990)
Di Vecchia, P, Fabricius, K, Rossi, G C, Veneziano, Gabriele
A treatment of hard processes sensitive to the infrared structure of QCD (1990)
Amati, Daniele, Bassetto, A, Ciafaloni, Marcello, Marchesini, G, Veneziano, Gabriele
Numerical checks of the lattice definition independence of topological charge fluctuations (1990)
Di Vecchia, P, Fabricius, K, Rossi, G C, Veneziano, Gabriele