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Partonic matter produced in the early stage of ultrarelativisticnucleus-nucleus collisions is assumed to be composed mainly of gluons, andquarks and antiquarks are produced at later times. To study the implications ofsuch a scenario, the dynamical evolution of a chemically nonequilibrated systemis described by the ideal (2+1)-dimensional hydrodynamics with a time dependent(anti)quark fugacity. The equation of state interpolates linearly between thelattice data for the pure gluonic matter and the lattice data for thechemically equilibrated quark-gluon plasma. The spectra and elliptic flows ofthermal dileptons and photons are calculated for central Pb+Pb collisions atthe CERN Large Hadron Collider energy of $\sqrt{s_{_{\rm NN}}} = 2.76$ TeV. Wetest the sensitivity of the results to the choice of equilibration times,including also the case where the complete chemical equilibrium of partons isreached already at the initial stage. It is shown that a suppression of quarksat early times leads to a significant reduction of the yield of the thermaldileptons, but only to a rather modest suppression of the $p_T$-distribution ofdirect photons. It is demonstrated that an enhancement of photon and dileptonelliptic flows might serve as a promising signature of the pure-glue initialstate.

Electromagnetic probes of a pure-glue initial state in nucleus-nucleus collisions at energies available at the CERN Large Hadron Collider