810 research outputs found
Hadronization Scheme Dependence of Long-Range Azimuthal Harmonics in High Energy p+A Reactions
We compare the distortion effects of three popular final-state hadronization
schemes. We show how hadronization modifies the initial-state gluon
correlations in high energy p+A collisions. The three models considered are (1)
LPH: local parton-hadron duality, (2) CPR: collinear parton- hadron resonance
independent fragmentation, and (3) LUND: color string hadronization. The strong
initial-state azimuthal asymmetries are generated using the GLVB model for
non-abelian gluon bremsstrahlung, assuming a saturation scale Qsat = 2 GeV.
Long-range elliptic and triangular harmonics for the final hadron pairs are
compared based on the three hadronization schemes. Our analysis shows that the
process of hadronization causes major distortions of the partonic azimuthal
harmonics for transverse momenta at least up to pT = 3GeV. In particular, they
appear to be greatly reduced for pT < 1{\div}2GeV.Comment: 13 pages, 7 figures, 2 table
A non-perturbative test of consistency relations and their violation
In this paper, we verify the large scale structure consistency relations
using N-body simulations, including modes in the highly non-linear regime.
These relations (pointed out by Kehagias & Riotto and Peloso & Pietroni) follow
from the symmetry of the dynamics under a shift of the Newtonian potential by a
constant and a linear gradient, and predict the absence of certain poles in the
ratio between the (equal time) squeezed bispectrum and power spectrum. The
consistency relations, as symmetry statements, are exact, but have not been
previously checked beyond the perturbative regime. Our test using N-body
simulations not only offers a non-perturbative check, but also serves as a
warm-up exercise for applications to observational data. A number of subtleties
arise when taking the squeezed limit of the bispectrum--we show how to
circumvent or address them. An interesting by-product of our investigation is
an explicit demonstration that the linear-gradient symmetry is unaffected by
the periodic boundary condition of the simulations. Lastly, we verify using
simulations that the consistency relations are violated when the initial
conditions are non-gaussian (of the local fNL type). The methodology developed
here paves the way for constraining primordial non-gaussianity using large
scale structure data, including (numerous) highly non-linear modes that are
otherwise hard to interpret and utilize.Comment: 10 pages, 5 figures, 1 tabl
An effective-gravity perspective on the Sun-Jupiter-comet three-body system
Within the solar system, approximate realizations of the three-body problem
occur when a comet approaches a planet while being affected mainly by such a
planet and the Sun, and this configuration was investigated by Tisserand within
the framework of Newtonian gravity. The exact relativistic treatment of the
problem is not an easy task, but the present paper develops an approximate
calculational scheme which computes for the first time the tiny
effective-gravity correction to the equation of the surface for all points of
which it is equally advantageous to regard the heliocentric motion as being
perturbed by the attraction of Jupiter, or the jovicentric motion as being
perturbed by the attraction of the Sun. This analysis completes the previous
theoretical investigations of effective-gravity corrections to the Newtonian
analysis of three-body systems, and represents an intermediate step towards
relativistic effects on cometary motions.Comment: Published versio
First Sound in Holographic Superfluids at Zero Temperature
Within the context of AdS/CFT, the gravity dual of an s-wave superfluid is
given by scalar QED on an asymptotically AdS spacetime. While this conclusion
is vastly supported by numerical arguments, here we provide an analytical proof
that this is indeed the case. Working at zero temperature, we explicitly find
the quadratic action for the superfluid phonon at the boundary in an arbitrary
number of dimensions and for an arbitrary scalar field potential, recovering
the known dispersion relation for conformal first sound.Comment: 14 pages. Extended discussions in sections 3 and
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Low energy physics for the high energy physicist - Effective theories, holographic duality and all that
In this work we discuss the application of high energy theory methods to the study of condensed matter problems. We focus in particular on the effective field theory (EFT) approach and on the holographic duality. We show that, in certain contexts, both techniques present some relevant advantages with respect to more standard approaches. In particular, we will study holographic superfluids, and make explicit connection between the holographic picture and the EFT one. We also determine for the first time the gravity dual of a solid, and show that it undergoes a first order phase transition, a “holographic melting”. On a more phenomenological ground, we study the motion of vortex lines in a confined superfluid. Using a suitable EFT we successfully reproduce the experimental results, and perform a number of steps forward with respect to traditional methods. Finally, we also discuss possible exciting directions for the future of EFTs and condensed matter
Optimal anti-ferromagnets for light dark matter detection
We propose anti-ferromagnets as optimal targets to hunt for sub-MeV dark
matter with spin-dependent interactions. These materials allow for multi-magnon
emission even for very small momentum transfers, and are therefore sensitive to
dark matter particles as light as the keV. We use an effective theory to
compute the event rates in a simple way. Among the materials studied here, we
identify nickel oxide (a well-assessed anti-ferromagnet) as an ideal candidate
target. Indeed, the propagation speed of its gapless magnons is very close to
the typical dark matter velocity, allowing the absorption of all its kinetic
energy, even through the emission of just a single magnon
A di-bottomonium at the LHC?
We study the case of a di-bottomonium particle at the LHC.
Its mass and decay width are obtained within a new model of diquark-antidiquark
interactions in tetraquarks. The same model solves several open problems on the
phenomenology of the experimentally better known states. We show that the
tetraquark is expected approximately 100 MeV below threshold,
and compare to a recent analysis by LHCb seeking it in the
final state.Comment: 7 pages, 3 figures. V2: figure added, figures corrected and updated,
typo correcte
Fractional Soft Limits of Scattering Amplitudes
It is a common lore that the amplitude for a scattering process involving one soft Nambu-Goldstone boson should scale like an integer power of the soft momentum. We revisit this expectation by considering the 2 → 2 scattering of phonons in solids. We show that, depending on the helicities of the phonons involved in the scattering process, the scattering amplitude may in fact vanish like a fractional power of the soft momentum. This is a peculiarity of the 4-point amplitude, which can be traced back to (1) the (spontaneous or explicit) breaking of Lorentz invariance, and (2) the approximately collinear kinematics arising when one of the phonons becomes soft. Our results extend to the general class of nonrelativistic shift-invariant theories of a vector field.publishedVersio
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