Zobrazeno 1 - 10
of 90
pro vyhledávání: '"Ghiglieri, J."'
Publikováno v:
JCAP 04 (2024) 062
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
Externí odkaz:
http://arxiv.org/abs/2401.08766
Autor:
Ghiglieri, J., Laine, M.
In a weakly coupled ultrarelativistic plasma, $1 + n \leftrightarrow 2 + n$ scatterings, with $n \ge 0$, need sometimes to be summed to all orders, in order to determine a leading-order interaction rate. To implement this "LPM resummation", kinematic
Externí odkaz:
http://arxiv.org/abs/2110.07149
Publikováno v:
JHEP 07 (2020) 092
We compute the production rate of the energy density carried by gravitational waves emitted by a Standard Model plasma in thermal equilibrium, consistently to leading order in coupling constants for momenta $k\sim \pi T$. Summing up the contributions
Externí odkaz:
http://arxiv.org/abs/2004.11392
Autor:
Ghiglieri, J., Laine, M.
Publikováno v:
JCAP 07(2020)012
It has been proposed that two resonances could coincide in the early universe at temperatures $T \sim 0.2 ... 0.5$ GeV: one between two nearly degenerate GeV-scale sterile neutrinos, producing a large lepton asymmetry through freeze-out and decays; a
Externí odkaz:
http://arxiv.org/abs/2004.10766
Autor:
Ghiglieri, J., Laine, M.
Publikováno v:
JHEP 1907 (2019) 078
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 numer
Externí odkaz:
http://arxiv.org/abs/1905.08814
Autor:
Ghiglieri, J., Laine, M.
Publikováno v:
JHEP 1902 (2019) 014
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 experiment
Externí odkaz:
http://arxiv.org/abs/1811.01971
Autor:
Ghiglieri, J., Laine, M.
Publikováno v:
JHEP 1802 (2018) 078
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 u
Externí odkaz:
http://arxiv.org/abs/1711.08469
Autor:
Ghiglieri, J., Laine, M.
Publikováno v:
JHEP 1705 (2017) 132
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 numbe
Externí odkaz:
http://arxiv.org/abs/1703.06087
Autor:
Ghiglieri, J., Laine, M.
Publikováno v:
JCAP 1607 (2016) 015
We estimate the thermal masses and damping rates of active (m < eV) and sterile (M ~ GeV) neutrinos with thermal momenta k ~ 3T at temperatures below the electroweak crossover (5 GeV < T < 160 GeV). These quantities fix the equilibration or "washout"
Externí odkaz:
http://arxiv.org/abs/1605.07720
Publikováno v:
Phys. Rev. D 94, 016005 (2016)
We estimate the photon production rate from an SU(3) plasma at temperatures of about 1.1Tc and 1.3Tc. Lattice results for the vector current correlator at spatial momenta k ~ (2-6)T are extrapolated to the continuum limit and analyzed with the help o
Externí odkaz:
http://arxiv.org/abs/1604.07544