Aleksi Kurkela
CERN
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Publication
Featured researches published by Aleksi Kurkela.
Physical Review D | 2010
Aleksi Kurkela; Paul Romatschke; Aleksi Vuorinen
We perform an O({alpha}{sub s}{sup 2}) perturbative calculation of the equation of state of cold but dense QCD matter with two massless and one massive quark flavor, finding that perturbation theory converges reasonably well for quark chemical potentials above 1 GeV. Using a running coupling constant and strange quark mass, and allowing for further nonperturbative effects, our results point to a narrow range where absolutely stable strange quark matter may exist. Absent stable strange quark matter, our findings suggest that quark matter in (slowly rotating) compact star cores becomes confined to hadrons only slightly above the density of atomic nuclei. Finally, we show that equations of state including quark matter lead to hybrid star masses up to M{approx}2M{sub {center_dot},} in agreement with current observations. For strange stars, we find maximal masses of M{approx}2.75M{sub {center_dot}}and conclude that confirmed observations of compact stars with M>2M{sub {center_dot}}would strongly favor the existence of stable strange quark matter.
Journal of High Energy Physics | 2011
Aleksi Kurkela; Guy D. Moore
A bstractWe investigate how relativistic, nonabelian plasmas approach equilibrium in a general context. Our treatment is entirely parametric and for small Yang-Mills coupling α. First we study isotropic systems with an initially nonequilibrium momentum distribution. We consider both the case of initially very high occupancy and initially very low occupancy. Then we consider systems which are anisotropic. We consider both weak anisotropy and large anisotropy, and allow the occupancy to be parametrically large or small. Writing the typical momentum of an initial excitation as Q and the final temperature as Tfinal, full equilibration occurs in a time
Physical Review Letters | 2015
Aleksi Kurkela; Yan Zhu
{t_{\text{eq}}} \sim {\alpha^{{ - {2}}}}T_{\text{final}}^{{ - 1}}
Journal of High Energy Physics | 2013
Jacopo Ghiglieri; Juhee Hong; Aleksi Kurkela; Egang Lu; Guy D. Moore; Derek Teaney
for Tfinal > Q, and
The Astrophysical Journal | 2014
Aleksi Kurkela; Eduardo S. Fraga; Jürgen Schaffner-Bielich; Aleksi Vuorinen
{t_{\text{eq}}} \sim {\alpha^{{ - 2}}}{Q^{{\frac{1}{2}}}}T_{\text{final}}^{{\frac{{ - 3}}{2}}}
Journal of High Energy Physics | 2011
Aleksi Kurkela; Guy D. Moore
for Tfinal < Q, unless the initial system is sufficiently anisotropic and
The Astrophysical Journal | 2014
Eduardo S. Fraga; Aleksi Kurkela; Aleksi Vuorinen
{T_{\text{final}}} > {\alpha^{{\frac{2}{3}}}}Q
Physical Review D | 2012
Aleksi Kurkela; Guy D. Moore
, in which 7 case equilibration occurs somewhat faster,
Physics Letters B | 2015
Aleksi Kurkela; Urs Achim Wiedemann
{t_{\text{eq}}} \sim \max \left( {{a^{{ - 2}}}{T^{{ - 1}}},\;{\alpha^{{\frac{{ - 13}}{7}}}}{Q^{{\frac{5}{7}}}}T_{\text{final}}^{{\frac{{ - 12}}{7}}}} \right)
Journal of High Energy Physics | 2016
Liam Keegan; Aleksi Kurkela; Paul Romatschke; Wilke van der Schee; Yan Zhu
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