1,721,051 research outputs found
Sensitivity of jet quenching to the initial state in heavy-ion collisions
Get PDFIn heavy-ion collisions, nuclear matter is subjected to extreme conditions in a highly dynamical, rapidly evolving environment. This poses a tremendous challenge for calculating jet quenching observables. Current approaches rely on analytical results for static cases, introducing theoretical uncertainties and biases in our understanding of the pre-equilibrated medium. To address this issue, we employ resummation schemes to derive analytical rates for radiative energy loss in generic, evolving backgrounds. We investigate regimes where rare scattering and multiple scattering with the dynamical medium occurs, and extract relevant scales governing the in-medium emission rate of soft gluons. Our analysis indicates that strong jet quenching is only possible when the equilibration time of the medium is longer than its mean free path, highlighting the importance of medium modifications of jets in the earliest stages of heavy-ion collisions. We also demonstrate analytically that a medium evolution, which initially has a small coupling to jets, typically leads to a stronger jet azimuthal asymmetry at the same jet suppression factor.6 pages, 3 figures and 2 supplemental material page
Role of magnetic interactions in neutron stars
No full textIn this work, we present a calculation of the non-Fermi liquid correction to the specific heat of magnetized degenerate quark matter present at the core of the neutron star. The role of non-Fermi liquid corrections to the neutrino emissivity has been calculated beyond leading order. We extend our result to the evaluation of the pulsar kick velocity and cooling of the star due to such anomalous corrections and present a comparison with the simple Fermi liquid case
Role of magnetic interactions in neutron stars
No full textIn this work, we present a calculation of the non-Fermi liquid correction to the specific heat of magnetized degenerate quark matter present at the core of the neutron star. The role of non-Fermi liquid corrections to the neutrino emissivity has been calculated beyond leading order. We extend our result to the evaluation of the pulsar kick velocity and cooling of the star due to such anomalous corrections and present a comparison with the simple Fermi liquid case
Medium-induced jet evolution for an expanding QGP
No full textWe will analyse the modification to the gluon distribution function for an expanding medium for Eq.(10). In addition, we will incorporate this modified gluon distributionfunction to study the kinematic rate equation to arrive at analytical expressions of the modified splitting function [3, 6]. The corresponding numerical estimations for the gluon distribution functions in medium can be greater orlesser than the vacuum counterpart; according to which it can be inferred that the jet will be quenched or enhanced in evolving medium
Medium-induced cascade in expanding media
Get PDFDetailed insight into the interplay between parton energy loss and the way deconfined medium created in heavy-ion collisions expands is of great importance for improving the understanding of the jet quenching phenomenon. In this paper we study the impact of the expansion of deconfined medium on the single-gluon emission spectrum, its resummation and the jet suppression factor (QAA) within the BDMPS-Z formalism. We calculate these quantities for three types of expansion scenarios, namely static, exponentially decaying and Bjorken expanding media. The distribution of medium-induced gluons is calculated using an evolution equation with splitting kernels derived from the gluon emission spectra. A universal behavior of splitting kernels is derived in the regime of soft gluon emissions when evaluated at a common effective evolution time τeff. Novel scaling features of the resulting gluon distribution and jet QAA are discussed. For realistic spectra valid beyond the soft-gluon emission limit, where the results are obtained by a numerical solution of the evolution equation, these features are partially replaced by a scaling expected from considering an averaged jet quenching parameter along the trajectory of propagation. Further we show that differences arising from different types of the medium expansion can be to a large extent scaled out by appropriate choice of the quenching parameter. Sizable differences among the values of the quenching parameter for different types of medium expansion point to the importance of the medium expansion for precise modeling of the jet quenching phenomenon.publishedVersio
Modifications to the pulsar kick velocity due to magnetic interactions in dense plasma
No full textIn this work we calculate pulsar kick velocity of magnetized neutronstar composed of degenerate quark matter core with non-Fermi liquid (NFL)correction. Both the leading order (LO) and next to leading order (NLO)corrections to the kick velocity have been incorporated. In addition, the NFLcorrections to the specific heat of magnetized quark matter have been presented.This has been taken into account to calculate the kick velocity of the neutronstar. Results show significant departure from the normal Fermi liquid estimates.The relation between radius and temperature has been shown with kick velocityof 100km/s with and without NFL corrections
Dynamically screened strongly quantized electron transport in binary neutron-star merger
Get PDFWe examine electron-transport coefficients in magnetized hot and dense
electron-ion plasma relevant in binary neutron star merger simulation. We
calculate electrical and thermal conductivities in low density, high
temperature, highly magnetized plasma of binary neutron star mergers where
quantum oscillatory behavior of electrons emerge. For pronounced thermodynamic
effects, we consider zeroth Landau level population of electrons for the
calculation of conductivity. We solve Boltzmann equation in presence of
magnetic field to obtain the dissipative components of electrical and thermal
conductivities. The dissipative coefficients are formulated considering
frequency dependent dynamical screening in the quantized electron-ion
scattering rate. Numerical estimations show that the effect of dynamical
screening of photon propagator on electrical and thermal conductivities is
pronounced. We observe that dynamical screening reduces the maxima of both the
electrical and thermal conductivities by factors of thirty one and twenty
respectively leading to a reduction in the corresponding time scales of these
coefficients. The common scaling factor between electrical and thermal
conductivity is also observed to follow cubic relationship with temperature
violating Wiedemann-Franz law.Comment: Accepted in The European Physical Journal C. arXiv admin note:
substantial text overlap with arXiv:2108.1187
10th International Conference on Hard and Electromagnetic Probes of High-Energy Nuclear Collisions
No full textWe present a study of the impact of the expansion of deconfined medium on single-gluon emission spectra and the jet suppression factor () within the BDMPS-Z formalism. These quantities are calculated for three types of media (static medium, exponentially decaying medium and Bjorken expanding medium). The distribution of medium-induced gluons and the jet are calculated using the evaluation of in-medium evolution with splitting kernels derived from the gluon emission spectra. A universal behavior of splitting kernels is derived for low- and high- regimes in the asymptote of large times and its impact on the resulting jet is discussed. For the full phase-space of the radiation, the scaling of jet with an effective quenching parameter is derived. The importance of the medium expansion for precise modeling of jet quenching phenomena as well as steps towards generalizing the results to other jet quenching observables are discussed
Dissociation of heavy quarkonium states in rapidly varying strong magnetic field
Get PDFIn a transient magnetic field, heavy quarkonium bound states evolve non
adiabatically. In presence of a strong magnetic field, and
become more tightly bound than we expected earlier for a pure
thermal medium. We have shown that in a time varying magnetic field, there is a
possibility of moderate suppression of through the non adiabatic
transition to continuum where as the is so tightly bound that
can not be dissociated through this process. We have calculated the
dissociation probabilities up to the first order in the time dependent
perturbation theory for different values of initial magnetic field intensity.Comment: 4 pages, 2 figure
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