Zobrazeno 1 - 10
of 91
pro vyhledávání: '"Blasi, Simone"'
First order phase transitions are violent phenomena that occur when the state of the universe evolves abruptly from one vacuum to another. A \emph{direct} phase transition connects a local vacuum to a deeper vacuum of the zero--temperature potential,
Externí odkaz:
http://arxiv.org/abs/2406.01596
Autor:
Blasi, Simone, Mariotti, Alberto
We study the impact of QCD axion strings in the cosmological history of electroweak (EW) symmetry breaking, focussing on the minimal KSVZ axion model. We consider the case of the pure SM Higgs potential as well as a simple scenario with a first order
Externí odkaz:
http://arxiv.org/abs/2405.08060
We revisit the electroweak phase transition in the scalar singlet extension of the standard model with a $\mathbb{Z}_2$ symmetry. In significant parts of the parameter space the phase transition occurs in two steps - including canonical benchmarks us
Externí odkaz:
http://arxiv.org/abs/2312.06749
Autor:
Blasi, Simone, Maltoni, Fabio, Mariotti, Alberto, Mimasu, Ken, Pagani, Davide, Tentori, Simone
We study the LHC phenomenology of an Axion Like Particle (ALP) that couples only derivatively with the top quark at tree level. We inspect the radiatively induced couplings with the SM fermions and (gauge) bosons and the associated production and dec
Externí odkaz:
http://arxiv.org/abs/2311.16048
The recent results from the Pulsar Timing Array (PTA) collaborations show the first evidence for the detection of a stochastic background of gravitational waves at the nHz frequencies. This discovery has profound implications for the physics of both
Externí odkaz:
http://arxiv.org/abs/2306.17830
We discuss the gravitational wave spectrum produced by first-order phase transitions seeded by domain wall networks. This setup is important for many two-step phase transitions as seen for example in the singlet extension of the standard model. Whene
Externí odkaz:
http://arxiv.org/abs/2302.06952
Publikováno v:
J. High Energ. Phys. 2023, 48 (2023)
We study the emergence and phenomenological consequences of recently proposed new structures, namely soft breaking of the Higgs shift symmetry and `maximal symmetry' of the composite sector, in holographic realizations of composite Higgs models. For
Externí odkaz:
http://arxiv.org/abs/2212.11007
Publikováno v:
JCAP 04 (2023) 008
We study the early Universe evolution of axion-like particle (ALP) domain walls taking into account the effect of friction from particles in the surrounding plasma, including the case of particles in thermal equilibrium and frozen out species. We cha
Externí odkaz:
http://arxiv.org/abs/2210.14246
Publikováno v:
JCAP04(2023)009
Cosmic strings are predicted by many Standard Model extensions involving the cosmological breaking of a symmetry with nontrivial first homotopy group and represent a potential source of primordial gravitational waves (GWs). Present efforts to model t
Externí odkaz:
http://arxiv.org/abs/2207.03510
Autor:
Blasi, Simone, Mariotti, Alberto
Topological defects can act as local impurities that seed cosmological phase transitions. In this paper we study the case of domain walls, and how they can affect the electroweak phase transition in the Standard Model extended with a $Z_2$-odd scalar
Externí odkaz:
http://arxiv.org/abs/2203.16450