# Project

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## Real-time observables in thermal field theory

 Applicant Laine Mikko 140234 Project funding Institut für Theoretische Physik Universität Bern University of Berne - BE Theoretical Physics 01.10.2012 - 30.09.2014 334'299.00
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### Keywords (3)

Particle Cosmology; Effective Field Theories; Thermal QCD

### Lay Summary (English)

Lay summary
Various real-time observables, such as particle production rates
from a hot medium, or "transport coefficients" (conductivities,
viscosities), play an important role in all contexts in which
relativistic thermal field theory is being applied. An example from
heavy ion collisions could be the diffusion coefficient of heavy quark
flavours, characterizing the efficiency at which "jets" containing
a charm or bottom quark get "quenched"; an example from cosmology
could be the production rate of right-handed neutrinos, playing
an important role in many Dark Matter and Baryon Asymmetry
computations. It is the strong interactions which play a crucial
role in heavy ion collisions whereas in cosmology weak interactions
are more prominent, yet both are described by non-Abelian gauge
theories, so that on the technical side many of the methods used
are similar. The goal of this project is to make progress towards
a reliable determination of selected real-time observables playing
a role in current heavy ion collision experiments as well as in
certain cosmological scenarios, by making use of both analytic
and numerical techniques.
 Direct link to Lay Summary Last update: 21.02.2013

### Responsible applicant and co-applicants

Name Institute
 Laine Mikko Institut für Theoretische Physik Universität Bern

### Employees

Name Institute
 Burnier Yannis Laboratoire de physique des particules et de cosmologie EPFL - SB - ITP - LPPC

### Publications

Publication
Rothkopf Alexander (2014), A first look at Bottomonium melting via a stochastic potential, in JHEP, 1404, 085-085.
Brandt B.B., Francis A., Laine M., Meyer H.B. (2014), A relation between screening masses and real-time rates, in JHEP, 1405, 117-117.
Ghisoiu I. and Laine M. (2014), Interpolation of hard and soft dilepton rates, in JHEP, 1410, 083-083.
Bodeker D., Laine M. (2014), Kubo relations and radiative corrections for lepton number washout, in JCAP, 1405, 041-041.
Burnier Yannis, Rothkopf Alexander (2013), A hard thermal loop benchmark for the extraction of the nonperturbative $Q\barQ$ potential, in Phys.Rev., D87, 114019-114019.
Burnier Yannis, Rothkopf Alexander (2013), A new Bayesian approach to the reconstruction of spectral functions, in Proceedings of Science (POS), LATTICE2013, 490-490.
Burnier Yannis, Rothkopf Alexander (2013), Bayesian approach to spectral function reconstruction for Euclidean quantum field theories, in Phys.Rev.Lett., 111, 182003-182003.
Burnier Yannis, Rothkopf Alexander (2013), Benchmarking the Bayesian reconstruction of the non-perturbative heavy $Q\barQ$ potential, in Proceedings of Science (POS), LATTICE2013, 491-491.
Burnier Y., Laine M. (2013), Charm mass effects in bulk channel correlations, in JHEP, 1311, 012-012.
Rothkopf Alexander (2013), From Complex to Stochastic Potential: Heavy Quarkonia in the Quark-Gluon Plasma, in Mod.Phys.Lett., A28, 1330005-1330005.
Kim Seyong, Petreczky Peter, Rothkopf Alexander (2013), Lattice NRQCD study of in-medium bottomonium states using $N_f = 2+1, 48^3 \times 12$ HotQCD configurations, in Proceedings of Science (PoS), LATTICE2013, 169-169.
Laine M., Rothkopf A. (2013), Light-cone Wilson loop in classical lattice gauge theory, in JHEP, 1307, 082-082.
Laine M. (2013), NLO thermal dilepton rate at non-zero momentum, in JHEP, 1311, 120-120.
Bodeker D., Laine M. (2013), Sommerfeld effect in heavy quark chemical equilibration, in JHEP, 1301, 037-037.
Burnier Y., Laine M. (2013), Temporal mesonic correlators at NLO for any quark mass, in Proceedings of Science (POS), LATTICE2013, 218-218.
Laine M. (2013), Thermal 2-loop master spectral function at finite momentum, in JHEP, 1305, 083-083.
Laine M. (2013), Thermal right-handed neutrino production rate in the relativistic regime, in JHEP, 1308, 138-138.
Francis A., Kaczmarek O., Laine M., Müller M., Neuhaus T., Ohno H. (2013), Towards the continuum limit in transport coefficient computations, in Proceedings of Science (POS), LATTICE2013, 453-453.
Laine M., Rothkopf A. (2013), Towards understanding thermal jet quenching via lattice simulations, in Proceedings of Science (POS), LATTICE2013, 174-174.
Burnier Y., Laine M. (2012), Massive vector current correlator in thermal QCD, in JHEP, 1211, 086-086.

### Scientific events

#### Active participation

Title Type of contribution Title of article or contribution Date Place Persons involved
 INT Program INT 14-3: Heavy Flavor and Electromagnetic Probes in Heavy Ion Collisions Talk given at a conference Heating up QGP: towards charm quark chemical equilibration 22.09.2014 Seattle, United States of America Laine Mikko;
 SEWM14 Poster Three-loop Debye mass and effective coupling in thermal QCD 14.07.2014 Lausanne, Switzerland Ghisoiu Ioan;
 SEWM14 Talk given at a conference Towards understanding chiral vortical effect 14.07.2014 Lausanne, Switzerland Sohrabi Anaraki Kiyoumars;
 KITP Program: Particlegenesis Talk given at a conference On radiative corrections in leptogenesis 23.06.2014 Santa Barbara, United States of America Laine Mikko;
 University of Helsinki Individual talk Three-loop Debye mass and effective coupling in thermal QCD 09.06.2014 Helsinki, Finland Ghisoiu Ioan;
 Facing Strong Dynamics Talk given at a conference Some non-equilibrium thermodynamics 02.06.2014 Liselund Castle, Denmark Laine Mikko;
 University of Geneva, Theoretical Physics Colloquium Individual talk Towards first principles in particle cosmology 11.04.2014 Genf, Switzerland Laine Mikko;
 Ions at the Future Circular Collider Talk given at a conference Heating up QGP: how far to charm quark chemical equilibration? 10.04.2014 Genf, Switzerland Laine Mikko;
 DPG Frühjahrstagung des Fachverbands Teilchenphysik Talk given at a conference Three-loop Debye mass in thermal QCD 24.03.2014 Mainz, Germany Ghisoiu Ioan;
 The 6th International Conference on Hard and Electromagnetic Probes of High-Energy Nuclear Collisions (Hard Probes 2013) Talk given at a conference On loop corrections to the dilepton rate 04.11.2013 Stellenbosch, South Africa Laine Mikko;
 The 31st International Symposium on Lattice Field Theory (LATTICE 2013) Talk given at a conference Temporal mesonic correlators at NLO for any quark mass (talk), Benchmarking the Bayesian reconstruction of the non-perturbative heavy QQ¯ potential (poster) 29.07.2013 Mainz, Germany Burnier Yannis;
 Heavy quarks and quarkonia in thermal QCD Talk given at a conference Heavy quarkonium physics from Euclidean correlators 02.04.2013 ECT, Trento, Italy Burnier Yannis;
 LNGS Individual talk Towards first principles in particle cosmology 24.01.2013 Gran Sasso, Italy Laine Mikko;
 TU Munich Individual talk Towards first principles in particle cosmology 13.12.2012 Garching München, Germany Laine Mikko;
 University of Zurich Individual talk Towards first principles in particle cosmology 22.10.2012 Zürich, Switzerland Laine Mikko;
 Xth Quark Confinement and the Hadron Spectrum Talk given at a conference Hot QCD vs. cosmology 08.10.2012 München, Germany Laine Mikko;

### Communication with the public

Communication Title Media Place Year
 Other activities Vortrag an Gymnasiallehrer aus Kanton Bern German-speaking Switzerland 2013

### Associated projects

Number Title Start Funding scheme
 146737 Electroweak scale cosmology in light of LHC data 01.01.2014 Project funding
 155935 Real-time observables in thermal field theory 01.10.2014 Project funding

### Abstract

Various real-time observables, such as particle production rates from a hot medium, or "transport coefficients" (conductivities, viscosities), play an important role in all contexts in which relativistic thermal field theory is being applied. An example from heavy ion collisions could be the diffusion coefficient of heavy flavours, characterizing the efficiency at which "jets" containing a charm or bottom quark get "quenched"; an example from cosmology could be the production rate of right-handed neutrinos, playing an important role in many Dark Matter and Baryon Asymmetry computations. It is the strong interactions which play a crucial role in heavy ion collisions whereas in cosmology weak interactions are more prominent, yet both are described by non-Abelian gauge theories, so that on the technical side many of the methods used are similar. The goal of this project is to make progress towards a reliable determination of selected real-time observables playing a role in current heavy ion collision experiments as well as in certain cosmological scenarios, by making use of both analytic and numerical techniques.
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