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pro vyhledávání: '"Cadavid, Alexander Gallego"'
Primordial black holes (PBH) can form in the early Universe from peaks of the primordial curvature perturbations. The statistics of the peaks determines the abundance of PBHs, and is related to the amplitude of the primordial curvature spectrum. We s
Externí odkaz:
http://arxiv.org/abs/2407.05109
Publikováno v:
Phys. Rev. D 106, 083512. Published 13 October 2022
Purely geometrical arguments show that there exist classes of homospectral inflationary cosmologies, i.e. different expansion histories producing the same spectrum of comoving curvature perturbations. We develop a general algorithm to reconstruct the
Externí odkaz:
http://arxiv.org/abs/2205.06735
Publikováno v:
Phys. Rev. D 105, 104051 (2022)
We study the consistency of the decoupling limit of the generalized SU(2) Proca theory (GSU2P). Namely, we study the healthiness of those terms whose analysis in the scalar limit was not originally established in the reconstruction of the full theory
Externí odkaz:
http://arxiv.org/abs/2204.04328
Publikováno v:
Phys. Rev. D 105, 124060 (2022)
In this work, we explore the construction of the most general vector-tensor theory with an SU(2) global symmetry in the vector sector as a proposal for a modified theory of gravity. We start with a general Lagrangian containing terms involving symmet
Externí odkaz:
http://arxiv.org/abs/2110.14623
Publikováno v:
Phys. Rev. D 102, 104066 (2020)
As a modified gravity theory that introduces new gravitational degrees of freedom, the generalized SU(2) Proca theory (GSU2P for short) is the non-Abelian version of the well-known generalized Proca theory where the action is invariant under global t
Externí odkaz:
http://arxiv.org/abs/2009.03241
Publikováno v:
JCAP12(2020)044
The Generalized Chaplygin Gas (GCG) model is characterized by the equation of state $P = -A \rho^{-\alpha}$, where $A>0$ and $\alpha < 1$. The model has been extensively studied due to its interesting properties and applicability in several contexts,
Externí odkaz:
http://arxiv.org/abs/1912.12298
Publikováno v:
Phys.Lett.B798:134958,2019
To date, different alternative theories of gravity, although related, involving Proca fields have been proposed. Unfortunately, the procedure to obtain the relevant terms in some formulations has not been systematic enough or exhaustive, thus resulti
Externí odkaz:
http://arxiv.org/abs/1905.10664
Publikováno v:
Physics Letters B, 2019
We show that in absence of entropy or effective anisotropic stress the freedom in the choice of the initial energy scale of inflation implies the existence of an infinite family of dual slow-roll parameters histories which can produce the same spectr
Externí odkaz:
http://arxiv.org/abs/1712.00089
Publikováno v:
JCAP 1805 (2018) no.05, 068
We study the degeneracy of the primordial spectrum and bispectrum of the curvature perturbation in single field inflationary models with a class of features in the inflaton potential. The feature we consider is a discontinuous change in the shape of
Externí odkaz:
http://arxiv.org/abs/1703.04621
Autor:
Cadavid, Alexander Gallego
Publikováno v:
J. Phys.: Conf. Ser. 831 012003, 2017
We compare the effects of local features (LF) and branch features (BF) of the inflaton potential on the spectrum of primordial perturbations. We show that LF affect the spectrum in a narrow range of scales while BF produce a step between large and sm
Externí odkaz:
http://arxiv.org/abs/1703.04375