Zobrazeno 1 - 10
of 117
pro vyhledávání: '"Furtado, A .G."'
In this work, we consider effects of the dynamical vacuum in quantum cosmology in presence of a minimum length introduced by the GUP (generalized uncertainty principle) related to the modified commutation relation $[\hat{X},\hat{P}] := \frac{i\hbar}{
Externí odkaz:
http://arxiv.org/abs/2012.09158
Autor:
Gonçalves, André Oakes O., Gusson, Michael F., Dilem, Bernardo B., Furtado, Raphael G., Francisco, Ronald O., Fabris, Júlio C., Nogueira, José A.
One of the most widely problem studied in quantum mechanics is of an infinite square-well potential. In a minimal-length scenario its study requires additional care because the boundary conditions at the walls of the well are not well fixed. In order
Externí odkaz:
http://arxiv.org/abs/2002.00692
Autor:
Gusson, M. F., Gonçalves, A. Oakes O., Francisco, R. O., Furtado, R. G., Fabris, J. C., Nogueira, J. A.
Publikováno v:
Eur.Phys.J. C78 (2018) no.3, 179
A minimal-length scenario can be considered as an effective description of quantum gravity effects. In quantum mechanics the introduction of a minimal length can be accomplished through a generalization of Heisenberg's uncertainty principle. In this
Externí odkaz:
http://arxiv.org/abs/1704.08236
We review the Eulerian description of hidrodynamics using Seliger-Whitham's formalism (in classical case) and Schutz's formalism (in relativistic case). In these formalisms, the velocity field of a perfect fluid is described by scalar potentials. Wit
Externí odkaz:
http://arxiv.org/abs/1610.04589
Autor:
Pereira, Amaro Olimpio, Jr, Morais, Rafael Cancella, Tavares, Maíra, Morozowski Filho, Marciano, Furtado, Ricardo C., Furtado, Marcelo G., Pessanha, José Francisco M.
Publikováno v:
In Environmental Impact Assessment Review March 2021 87
Publikováno v:
Phys.Rev.D73:123513,2006
The string effective action at tree level contains, in its bosonic sector, the Einstein-Hilbert term, the dilaton, and the axion, besides scalar and gauge fields coming from the Ramond-Ramond sector. The reduction to four dimensions brings to scene m
Externí odkaz:
http://arxiv.org/abs/hep-th/0512209
Publikováno v:
Phys.Rev. D67 (2003) 124003
The possibility of obtaining singularity free cosmological solutions in four dimensional effective actions motivated by string theory is investigated. In these effective actions, in addition to the Einstein-Hilbert term, the dilatonic and the axionic
Externí odkaz:
http://arxiv.org/abs/hep-th/0212312
Autor:
Fabris, J. C., Furtado, R. G.
Singularity-free cosmological solutions may be obtained from the string action at tree level if the dimension of the space-time is greater than 10 and if brane configurations are taken into account. The behaviour of the dilaton field in this case is
Externí odkaz:
http://arxiv.org/abs/gr-qc/0211096
Publikováno v:
Phys.Rev. D61 (2000) 043503
We study cosmological scenarios resulting from effective actions in four dimensions which are, under some assumptions, connected with multidimensional, supergravity and string theories. These effective actions are labeled by the parameters $\omega$,
Externí odkaz:
http://arxiv.org/abs/gr-qc/9906122
Autor:
Ribeiro, Arthur C.1,2 (AUTHOR), Furtado, José G. M.2 (AUTHOR), Silva, Luiz A. F.2 (AUTHOR), Soares, Bluma G.1,3 (AUTHOR) bluma@metalmat.ufrj.br
Publikováno v:
Polymer Composites. Jul2020, Vol. 41 Issue 7, p2557-2567. 11p.