Zobrazeno 1 - 10
of 35
pro vyhledávání: '"Celoria, Marco"'
Publikováno v:
JHEP 06 (2021) 147
We study primordial non-gaussianity in supersolid inflation. The dynamics of supersolid is formulated in terms of an effective field theory based on four scalar fields with a shift symmetric action minimally coupled with gravity. In the scalar sector
Externí odkaz:
http://arxiv.org/abs/2103.10402
Inflationary perturbations are approximately Gaussian and deviations from Gaussianity are usually calculated using in-in perturbation theory. This method, however, fails for unlikely events on the tail of the probability distribution: in this regime
Externí odkaz:
http://arxiv.org/abs/2103.09244
Inflation driven by a generic self-gravitating medium is an interesting alternative to study the impact of spontaneous spacetime symmetry breaking during a quasi de-Sitter phase, in particular the 4-dimensional diffeomorphism invariance of GR is spon
Externí odkaz:
http://arxiv.org/abs/2010.02023
We study the dynamics of inflation driven by an adiabatic self-gravitating medium, extending the previous works on fluid and solid inflation. Such a class of media comprises perfect fluids, zero and finite temperature solids. By using an effective fi
Externí odkaz:
http://arxiv.org/abs/1907.11784
Autor:
Celoria, Marco, Matarrese, Sabino
Here we review the present status of modelling of and searching for primordial non-Gaussianity of cosmological perturbations. After introducing the models for non-Gaussianity generation during inflation, we discuss the search for non-Gaussian signatu
Externí odkaz:
http://arxiv.org/abs/1812.08197
Akademický článek
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We describe some key astrophysical processes driving the formation and evolution of black hole binaries of different nature, from stellar-mass to supermassive systems. In the first part, we focus on the mainstream channels proposed for the formation
Externí odkaz:
http://arxiv.org/abs/1807.11489
Publikováno v:
JCAP 1901 (2019) no.01, 057
We address the question whether a medium featuring $p + \rho = 0$, dubbed $\Lambda$- medium, has to be necessarily a cosmological constant. By using effective field theory, we show that this is not the case for a class of media comprising perfect flu
Externí odkaz:
http://arxiv.org/abs/1712.04827
Publikováno v:
Phys. Rev. D 98, 064016 (2018)
Generic massive gravity models in the unitary gauge correspond to a self-gravitating medium with six degrees of freedom. It is widely believed that massive gravity models with six degrees of freedom have an unavoidable ghost-like instability; however
Externí odkaz:
http://arxiv.org/abs/1711.10424
Perfect fluids are modeled by using an effective field theory approach which naturally gives a self-consistent and unambiguous description of the intrinsic non-adiabatic contribution to pressure variations. We study the impact of intrinsic entropy pe
Externí odkaz:
http://arxiv.org/abs/1711.01961