Zobrazeno 1 - 10
of 10 193
pro vyhledávání: '"A. Simas"'
In this work, we investigate the dynamics of a scalar field in the nonintegrable $\displaystyle \phi ^{4}$ model, restricted to the half-line. Here we consider singular solutions that interpolate the Dirichlet boundary condition $\phi(x=0,t)=H$ and t
Externí odkaz:
http://arxiv.org/abs/2411.04343
We consider an extended model with two real scalar fields, $\phi(x,t)$ and $\chi(x,t)$. The first sector is controlled by the sine-Gordon superpotential, while the second field is submitted to the $\chi^4$ one. The fields mutually interact via a nont
Externí odkaz:
http://arxiv.org/abs/2411.00512
The computational cost for inference and prediction of statistical models based on Gaussian processes with Mat\'ern covariance functions scales cubicly with the number of observations, limiting their applicability to large data sets. The cost can be
Externí odkaz:
http://arxiv.org/abs/2410.13000
Autor:
Gomes, Adalto R., Simas, Fabiano C.
In this paper, we present topological defects in $(1,1)$ dimensions, described by an extended nonlinear $O(3)$ sigma model. We consider spherical coordinates $(\phi,\chi)$ in the $S^2$ isotopic space and a potential $V(\phi,\chi)$. For specific forms
Externí odkaz:
http://arxiv.org/abs/2410.10445
Autor:
Bazeia, Dionisio, Simas, Fabiano C.
Publikováno v:
Eur. Phys. J. C 84 (2024) 1039L
The Yukawa coupling of fermions with a periodic bosonic background is shown to give rise to several bound states to the fermionic spectrum, with some bound states gluing together around specific energy eingenvalues as the Yukawa coupling increases. T
Externí odkaz:
http://arxiv.org/abs/2410.00305
We consider an enlarged $(1+1)$-dimensional model with two real scalar fields, $\phi$ and $\chi$ whose scalar potential $V(\phi,\chi)$ has a standard $\chi^4$ sector and a sine-Gordon one for $\phi$. These fields are coupled through a generalizing fu
Externí odkaz:
http://arxiv.org/abs/2409.09767
Autor:
Hansen, Colin, Glinskis, Simas, Raju, Ashwin, Kornreich, Micha, Park, JinHyeong, Pawar, Jayashri, Herzog, Richard, Zhang, Li, Odry, Benjamin
Data driven models for automated diagnosis in radiology suffer from insufficient and imbalanced datasets due to low representation of pathology in a population and the cost of expert annotations. Datasets can be bolstered through data augmentation. H
Externí odkaz:
http://arxiv.org/abs/2406.02477
Autor:
Simas, Fabiano C., da Hora, E.
We examine the oscillon decay in a model with a single scalar field and two asymmetric fundamental states. Specifically, we verify how the evolution of an initially excited oscillon leads to the formation of antikink-kink pairs in the presence of a c
Externí odkaz:
http://arxiv.org/abs/2404.17848
Publikováno v:
Annals of Physics, Volume 470, November 2024, 169777
Higher-order scalar field models in two dimensions, including the $\phi^8$ model, have been researched. It has been shown that for some special cases of the minima positions of the potential, the explicit kink solutions can be found. However, in phys
Externí odkaz:
http://arxiv.org/abs/2402.00270
Penalizing complexity (PC) priors is a principled framework for designing priors that reduce model complexity. PC priors penalize the Kullback-Leibler Divergence (KLD) between the distributions induced by a ``simple'' model and that of a more complex
Externí odkaz:
http://arxiv.org/abs/2312.04481