Zobrazeno 1 - 10
of 73
pro vyhledávání: '"Santillan, O."'
Autor:
Morano, A., Santillán, O.
The present work studies the gravitational radiation of a non abelian vortex with a non compact internal moduli describing its excitations. This situation may be realised by semi-local supersymmetric vortices \cite{novedad1}-\cite{reviewshifman}, alt
Externí odkaz:
http://arxiv.org/abs/2311.05279
Autor:
Lanosa, L., Santillan, O.
In the present letter the infinite domain wall geometry in GR \cite{vilenkin1}-\cite{ipser} is reconsidered in Taub coordinates \cite{taub}. The use of these coordinates makes explicit that the regions between the horizons and the wall and the outer
Externí odkaz:
http://arxiv.org/abs/2310.10968
Autor:
Santillán, O., Morano, A.
The axion quark nuggets introduced in \cite{zhitnitsky}-\cite{zhitnitsky13} are a candidate for cold dark matter which, in addition, may be relevant in baryogenesis scenarios. The present work studies their evolution till they enter in the colour sup
Externí odkaz:
http://arxiv.org/abs/2011.06747
Autor:
Morales, J. Osorio, Santillán, O.
As is well known, there exists warp drives in GR, such as the Alcubierre bubbles, which achieve an apparent faster than light travel \cite{alcubierre}. A result due to Gao and Wald \cite{gaowald} suggests that such a travel is unlikely for GR with ma
Externí odkaz:
http://arxiv.org/abs/2004.12523
Autor:
Santillan, O., Sempe, M.
The present work studies the dynamics of axion quark nuggets introduced in \cite{zhitnitsky} and exploited in the works \cite{zhitnitsky2}-\cite{zhitnitsky13}. The new feature considered here is the possibility that these nuggets become ferromagnetic
Externí odkaz:
http://arxiv.org/abs/1908.09409
Publikováno v:
MDPI Physics 1 (2019), 321-338
We consider a finite-size spherical bubble with a nonequilibrium value of the $q$-field, where the bubble is immersed in an infinite vacuum with the constant equilibrium value $q_{0}$ for the $q$-field (this $q_{0}$ has already cancelled an initial c
Externí odkaz:
http://arxiv.org/abs/1901.05938
Autor:
Morales, J. Osorio, Santillán, O.
The focus of the present work is on the Cauchy problem for the quadratic gravity models introduced in \cite{stelle}-\cite{stelle2}. These are renormalizable higher order derivative models of gravity, but at cost of ghostly states propagating in the p
Externí odkaz:
http://arxiv.org/abs/1811.07869
Autor:
Morales, J. Osorio, Santillan, O.
The q-models are scenarios that may explain the smallness of the cosmological constant [1]-[7]. The vacuum in these theories is presented as a self-sustainable medium and include a new degree of freedom, the q-variable, which stablish the equilibrium
Externí odkaz:
http://arxiv.org/abs/1808.07756
In the present paper the possibility of eternal universes in Gauss-Bonnet theories of gravity in four dimensions is analysed. It is shown that, for zero spatial curvature and zero cosmological constant, if the coupling is such that $0
Externí odkaz:
http://arxiv.org/abs/1711.09484
Autor:
Santillan, O., Scornavacche, M.
As is well known, there exist some Lorentz breaking scenarios which explain the smallness of the cosmological constant in the present era. An important aspect to analyze is the propagation of gravitational waves and the screening or enhancement of th
Externí odkaz:
http://arxiv.org/abs/1705.04897