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1.
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An effective-theory perspective on bubble nucleation and growth
/ Laine, Mikko Sakari (speaker) (Universitaet Bern (CH))
Certain aspects of phase transition dynamics, at least the initial nucleations and subsequent growth, can be described within the framework of fluctuating hydrodynamics, extended by a scalar order parameter. A strength of this formulation is that the contributions of small and large momenta can be factorized. [...]
2025 - 2600.
TH institutes; Advancing gravitational wave predictions from cosmological first-order phase transitions
External links: Talk details; Event details
In : Advancing gravitational wave predictions from cosmological first-order phase transitions
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2.
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Update on reheating after inflation and its gravitational wave probes
/ Laine, Mikko Sakari (speaker) (Universitaet Bern (CH))
The reheating stage remains a strongly model-dependent and theoretically poorly understood part of the inflationary paradigm. However, the possibility that it could one day be tested via its gravitational wave signatures, and that it may also be related to other relicts such as dark matter or baryon asymmetry, continues to motivate studies with many models and methods. [...]
2024 - 4129.
Theory Colloquia
External link: Event details
In : Update on reheating after inflation and its gravitational wave probes
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3.
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Double-graviton production from Standard Model plasma
/ Ghiglieri, J. (SUBATECH, Nantes) ; Laine, M. (Bern U.) ; Schütte-Engel, J. (UC, Berkeley ; Wako, RIKEN) ; Speranza, E. (CERN)
The thermal plasma filling the early universe generated a stochastic gravitational wave background that peaks in the microwave frequency range today. If the graviton production rate is expressed as a series in a fine-structure constant, $\alpha$, and the temperature over the Planck mass, $T^2_{ } / m_{\rm pl}^2$, then the lowest-order contributions come from single ($\sim \alpha T^2_{ }/m_{\rm pl}^2$) and double ($\sim T^4_{ }/m_{\rm pl}^4$) graviton production via $2\to 2$ scatterings. [...]
arXiv:2401.08766; RIKEN-iTHEMS-Report-24; CERN-TH-2023-216.-
2024-04-23 - 16 p.
- Published in : JCAP 2404 (2024) 062
Fulltext: 2401.08766 - PDF; document - PDF;
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4.
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Effective Field Theory in Particle Physics and Cosmology : Lecture Notes of the Les Houches Summer School : Volume 108, July 2017
3 - 28 Jul 2017
- Les Houches, France
/ Davidson, Sacha (ed.); Gambino, Paolo (ed.); Laine, Mikko (ed.); Neubert, Matthias (ed.); Salomon, Christophe (ed.)
The topic of the CVIII session of Les Houches School, held in July 2017, was Effective Field Theory (EFT). The goal of this school was to offer a broad introduction to the foundations and modern applications of Effective Field Theory in many of its incarnations..
Oxford : Oxford University Press, 2020
e-proceedings
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5.
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Sterile neutrino dark matter via GeV-scale leptogenesis?
/ Ghiglieri, J. (CERN) ; Laine, M. (U. Bern, AEC)
It has been proposed that in a part of the parameter space of the Standard Model completed by three generations of keV...GeV right-handed neutrinos, neutrino masses, dark matter, and baryon asymmetry can be accounted for simultaneously. Here we numerically solve the evolution equations describing the cosmology of this scenario in a 1+2 flavour situation at temperatures $T \le 5$ GeV, taking as initial conditions maximal lepton asymmetries produced dynamically at higher temperatures, and accounting for late entropy and lepton asymmetry production as the heavy flavours fall out of equilibrium and decay. [...]
arXiv:1905.08814; CERN-TH-2019-062.-
2019-07-15 - 20 p.
- Published in : JHEP 07 (2019) 078
Article from SCOAP3: PDF; Fulltext: PDF;
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6.
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Precision study of GeV-scale resonant leptogenesis
/ Ghiglieri, J. (CERN) ; Laine, M. (U. Bern, AEC)
Low-scale leptogenesis is most efficient in the limit of an extreme mass degeneracy of right-handed neutrino flavours. Two variants of this situation are of particular interest: large neutrino Yukawa couplings, which boost the prospects of experimental scrutiny, and small ones, which may lead to large lepton asymmetries surviving down to T < 5 GeV. [...]
arXiv:1811.01971; CERN-TH-2018-232.-
2019-02-04 - 43 p.
- Published in : JHEP 02 (2019) 014
Article from SCOAP3: scoap3-fulltext - PDF; scoap - PDF; Fulltext: PDF;
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7.
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GeV-scale hot sterile neutrino oscillations: a numerical solution
/ Ghiglieri, J. (CERN) ; Laine, M. (Bern U. ; U. Bern, AEC)
The scenario of baryogenesis through GeV-scale sterile neutrino oscillations is governed by non-linear differential equations for the time evolution of a sterile neutrino density matrix and Standard Model lepton and baryon asymmetries. By employing up-to-date rate coefficients and a non-perturbatively estimated Chern-Simons diffusion rate, we present a numerical solution of this system, incorporating the full momentum and helicity dependences of the density matrix. [...]
arXiv:1711.08469; CERN-TH-2018-022.-
2018-02-13 - 26 p.
- Published in : JHEP 02 (2018) 078
Article from SCOAP3: scoap3-fulltext - PDF; scoap - PDF; Fulltext: PDF;
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8.
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Status of rates and rate equations for thermal leptogenesis
/ Biondini, Simone (U. Bern, AEC) ; Bodeker, Dietrich (Bielefeld U.) ; Brambilla, Nora (Munich, Tech. U.) ; Garny, Mathias (Munich, Tech. U.) ; Ghiglieri, Jacopo (CERN) ; Hohenegger, Andreas (Stavanger U.) ; Laine, Mikko (U. Bern, AEC) ; Mendizabal, Sebastian (Santa Maria U., Valparaiso) ; Millington, Peter (Nottingham U.) ; Salvio, Alberto (CERN) et al.
In many realizations of leptogenesis, heavy right-handed neutrinos play the main role in the generation of an imbalance between matter and antimatter in the early Universe. Hence, it is relevant to address quantitatively their dynamics in a hot and dense environment by taking into account the various thermal aspects of the problem at hand. [...]
arXiv:1711.02864.-
2018-02-28 - 31 p.
- Published in : Int. J. Mod. Phys. A 33 (2018) 1842004
Fulltext: PDF;
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9.
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Heavy-flavor production and medium properties in high-energy nuclear collisions - What next?
/ Aarts, G. (Swansea U.) ; Aichelin, J. (SUBATECH, Nantes) ; Allton, C. (Swansea U.) ; Arnaldi, R. (INFN, Turin) ; Bass, S.A. (Duke U.) ; Bedda, C. (Utrecht U.) ; Brambilla, N. (Munich, Tech. U. ; TUM-IAS, Munich) ; Bratkovskaya, E. (Darmstadt, EMMI ; Frankfurt U.) ; Braun-Munzinger, P. (Darmstadt, EMMI ; Heidelberg U.) ; Bruno, G.E. (INFN, Bari ; Bari U. ; CERN) et al.
Open and hidden heavy-flavor physics in high-energy nuclear collisions are entering a new and exciting stage towards reaching a clearer understanding of the new experimental results with the possibility to link them directly to the advancement in lattice Quantum Chromo-dynamics (QCD). Recent results from experiments and theoretical developments regarding open and hidden heavy-flavor dynamics have been debated at the Lorentz Workshop "Tomography of the quark-gluon plasma with heavy quarks}, which was held in October 2016 in Leiden, the Netherlands [...]
arXiv:1612.08032.-
2017-05-16 - 23 p.
- Published in : Eur. Phys. J. A 53 (2017) 93
Fulltext: i2017-12282-9 - PDF; arXiv:1612.08032 - PDF; Fulltext from Publisher: PDF;
In : Lorentz Workshop : Tomography of the Quark-Gluon Plasma with Heavy Quarks, Leiden, The Netherlands, 10 - 14 Oct 2016
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10.
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GeV-scale hot sterile neutrino oscillations: a derivation of evolution equations
/ Ghiglieri, J. (CERN) ; Laine, M. (U. Bern, AEC)
Starting from operator equations of motion and making arguments based on a separation of time scales, a set of equations is derived which govern the non-equilibrium time evolution of a GeV-scale sterile neutrino density matrix and active lepton number densities at temperatures T > 130 GeV. The density matrix possesses generation and helicity indices; we demonstrate how helicity permits for a classification of various sources for leptogenesis. [...]
arXiv:1703.06087.-
2017-05-23 - 33 p.
- Published in : JHEP 05 (2017) 132
Article from SCOAP3: scoap3-fulltext - PDF; scoap - PDF; Fulltext: PDF;
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