Zobrazeno 1 - 10
of 104
pro vyhledávání: '"Ubaldi, Lorenzo"'
We revisit the decay rate of the electroweak vacuum in the Standard Model with the full one-loop prefactor. We focus on the gauge degrees of freedom and derive the degeneracy factors appearing in the functional determinant using group theoretical arg
Externí odkaz:
http://arxiv.org/abs/2406.05180
We consider a single real scalar field in flat spacetime with a polynomial potential up to $\phi^4$, that has a local minimum, the false vacuum, and a deeper global minimum, the true vacuum. When the vacua are almost degenerate we are in the thin wal
Externí odkaz:
http://arxiv.org/abs/2404.17632
Building on recently constructed inflationary vector dark matter production mechanisms as well as studies of magnetogenesis, we show that an inflationary dark Schwinger mechanism can generate the observed dark matter relic abundance for `dark electro
Externí odkaz:
http://arxiv.org/abs/2312.15137
We consider a simple setup with a dark sector containing dark electrons charged under an abelian $U(1)_D$ gauge symmetry. We show that if the massless dark photon associated to the $U(1)_D$ is produced during inflation in such a way as to form a clas
Externí odkaz:
http://arxiv.org/abs/2311.09475
We present a fully analytical calculation of the false vacuum decay rate for a self-interacting scalar field in the thin-wall approximation. We obtain the bounce solution, together with the Euclidean action, counter-terms and renormalization group ru
Externí odkaz:
http://arxiv.org/abs/2304.02290
Publikováno v:
J. High Energ. Phys. 2022, 209 (2022)
We derive a closed-form false vacuum decay rate at one loop in the thin wall limit, where the true and false vacua are nearly degenerate. We obtain the bounce configuration in $D$ dimensions, together with the Euclidean action with a higher order cor
Externí odkaz:
http://arxiv.org/abs/2202.04498
We study in detail a recently proposed mechanism for producing non-thermal dark photon dark matter at the end of inflation in the mass range $\mu\,{\rm eV} \lesssim m \lesssim 10\,{\rm TeV}$. A tachyonic instability induced by a rolling inflaton lead
Externí odkaz:
http://arxiv.org/abs/2103.12145
Autor:
Kobayashi, Takeshi, Ubaldi, Lorenzo
A kinetic mixing between the axion and the inflaton allows for a production of axion dark matter even if the inflationary Hubble scale is smaller than the zero-temperature axion mass. We analyze the axion dynamics in this recently discovered "inflaxi
Externí odkaz:
http://arxiv.org/abs/2006.09389
Autor:
Kobayashi, Takeshi, Ubaldi, Lorenzo
Publikováno v:
JHEP08(2019)147
A new mechanism for producing axion dark matter is proposed. By invoking low-scale inflation and a kinetic mixing between the axion and the inflaton, it is shown that the axion is driven to a field point slightly displaced from the potential minimum,
Externí odkaz:
http://arxiv.org/abs/1907.00984
It has been shown that the longitudinal mode of a massive vector boson can be produced by inflationary fluctuations and account for the dark matter content of the Universe. In this work we examine the possibility of instead producing the transverse m
Externí odkaz:
http://arxiv.org/abs/1810.07208