Zobrazeno 1 - 10
of 53
pro vyhledávání: '"Costa, H. A. S."'
Publikováno v:
Int. J. Geom. Methods Mod. Phys. 19, 2250169 (2022)
We compute analytically the radiative quantum corrections, up to next-to-leading loop order, to the universal critical exponents for both massless and massive O($N$) $\lambda\phi^{4}$ scalar squeezed field theories for probing the universality hypoth
Externí odkaz:
http://arxiv.org/abs/2211.08846
In this work, we investigate how the anisotropy affects the cosmological parameters estimation. Here the anisotropy is incorporated as a small gravitational disturbance. We calculate the Fisher information for both cosmological parameters $\epsilon$
Externí odkaz:
http://arxiv.org/abs/2109.08252
Publikováno v:
Scientific Reports 12, 6697 (2022)
We apply estimation theory to a system formed by two interacting trapped ions. By using the Fisher matrix formalism, we introduce a simple scheme for estimation of the temperature of the longitudinal vibrational modes of the ions. We use the ions int
Externí odkaz:
http://arxiv.org/abs/2109.05008
Autor:
Costa, H. A. S., Carvalho, P. R. S.
Publikováno v:
Class. Quantum Grav. 36, 075008 (2019)
We probe the effect of diffeomorphism symmetry on the critical exponents values for massive O($N$) $\lambda\phi^{4}$ scalar field theories in curved spacetime. We apply field-theoretic renormalization group tools, where we use only momentum coordinat
Externí odkaz:
http://arxiv.org/abs/2103.01899
Autor:
Costa, H. A. S., Carvalho, P. R. S.
Publikováno v:
Europhys. Lett. 128, 40009 (2019)
In this Letter we compute analytically the effect of conformal symmetry on the radiative corrections to the amplitude ratios for O($N$) $\lambda\phi^{4}$ massless scalar field theories in curved spacetime for probing the two-scale-factor universality
Externí odkaz:
http://arxiv.org/abs/2010.11104
Autor:
Costa, H. A. S., Carvalho, P. R. S.
Publikováno v:
Int. J. Mod. Phys. D 28, 1950024 (2018)
In this paper we investigate analytically the conformal symmetry influence on the next-to-leading order radiative quantum corrections to critical exponents for massless O($N$) $\lambda\phi^{4}$ scalar field theories in curved spacetime. We renormaliz
Externí odkaz:
http://arxiv.org/abs/1908.02272
Publikováno v:
Phys. Rev. D 100, 105018 (2019)
We consider a QED scattering ($AB\rightarrow AB$), in which $B$ is initially entangled with a third particle ($C$) that does not participate directly in the scattering. The effect of the scattering over $C$'s final state is evaluated and we note cohe
Externí odkaz:
http://arxiv.org/abs/1907.10466
Publikováno v:
Phys. Rev. D 98, 125009 (2018)
We evaluate the effect of quantum electrodynamics on the correlations between Dirac field modes corresponding electron-positron pairs of opposite momenta generated by expansion of an asymptotically flat Friedmann-Robertson-Walker (FRW) universe. The
Externí odkaz:
http://arxiv.org/abs/1811.00575
Publikováno v:
Int. J. Mod. Phys. D, V. 28, P. 1950028, 2018
We employ techniques from quantum estimation theory (QET) to estimate the Lorentz violation parameters in the 1+3-dimensional flat spacetime. We obtain and discuss the expression of the quantum Fisher information (QFI) in terms of the Lorentz violati
Externí odkaz:
http://arxiv.org/abs/1810.11379
Autor:
de Sá Neto, O. P.1 (AUTHOR), Costa, H. A. S.2 (AUTHOR), Prataviera, G. A.3 (AUTHOR), de Oliveira, M. C.4 (AUTHOR) marcos@ifi.unicamp.br
Publikováno v:
Scientific Reports. 4/23/2022, Vol. 12 Issue 1, p1-15. 15p.