Zobrazeno 1 - 10
of 102
pro vyhledávání: '"Morgante, Enrico"'
Autor:
Madge, Eric, Morgante, Enrico, Puchades-Ibáñez, Cristina, Ramberg, Nicklas, Ratzinger, Wolfram, Schenk, Sebastian, Schwaller, Pedro
Publikováno v:
JHEP 2023 no.10, 171 (2023)
In recent years, several pulsar timing array collaborations have reported first hints for a stochastic gravitational wave background at nano-Hertz frequencies. Here we elaborate on the possibility that this signal comes from new physics that leads to
Externí odkaz:
http://arxiv.org/abs/2306.14856
Publikováno v:
Phys.Rev.D 107 (2023) 3, 036010
We analyze the phase transition in improved holographic QCD to obtain an estimate of the gravitational wave signal emitted in the confinement transition of a pure SU(3) Yang-Mills dark sector. We derive the effective action from holography and show t
Externí odkaz:
http://arxiv.org/abs/2210.11821
We analyze the phenomenon of axion fragmentation when an axion field rolls over many oscillations of a periodic potential. This is particularly relevant for the case of relaxion, in which fragmentation provides the necessary energy dissipation to sto
Externí odkaz:
http://arxiv.org/abs/2109.13823
Publikováno v:
JCAP05 (2021) 004
We derive structure formation limits on dark matter (DM) composed of keV-scale axion-like particles (ALPs), produced via freeze-in through the interactions with photons and Standard Model (SM) fermions. We employ Lyman-alpha (Ly-{\alpha}) forest data
Externí odkaz:
http://arxiv.org/abs/2012.09181
Autor:
Fonseca, Nayara, Morgante, Enrico
Publikováno v:
Phys. Rev. D 103, 015011 (2021)
We investigate the interplay between early universe cosmology and dark matter direct detection, considering axion models with naturally suppressed couplings to photons. In the context of the cosmological relaxation of the electroweak scale, we focus
Externí odkaz:
http://arxiv.org/abs/2009.10974
In implementations of the electroweak scale cosmological relaxation mechanism proposed so far, the effect of the quantum fluctuations of the homogeneous relaxion field has been ignored. We show that they can grow during the classical cosmological evo
Externí odkaz:
http://arxiv.org/abs/1911.08473
We investigate the production of axion quanta during the early universe evolution of an axion-like field rolling down a wiggly potential. We compute the growth of quantum fluctuations and their back-reaction on the homogeneous zero-mode. We evaluate
Externí odkaz:
http://arxiv.org/abs/1911.08472
Publikováno v:
JCAP10(2019)032
The coupling of an axion-like particle driving inflation to the Standard Model particle content through a Chern-Simons term generically sources a dual production of massless helical gauge fields and chiral fermions. We demonstrate that the interplay
Externí odkaz:
http://arxiv.org/abs/1905.13318
Autor:
Fonseca, Nayara, Morgante, Enrico
Publikováno v:
Phys. Rev. D 100, 055010 (2019)
We highlight a new connection between the Standard Model hierarchy problem and the dark matter sector. The key piece is the relaxion field, which besides scanning the Higgs mass and setting the electroweak scale, also constitutes the observed dark ma
Externí odkaz:
http://arxiv.org/abs/1809.04534