Zobrazeno 1 - 10
of 4 940
pro vyhledávání: '"Brito L."'
In the present work we analyze two different models of interaction between dark energy and dark matter, also known as vacuum decay models or $\Lambda(t)$CDM models. In both models, when the $H_0$ parameter is constrained by the Planck distance priors
Externí odkaz:
http://arxiv.org/abs/2412.06756
Quantum photon effects in vacuum provide an interesting setting to test quantum electrodynamics, serving as a source for predictions about physics beyond the Standard Model. In this paper, we investigate these effects by calculating the one-loop Eule
Externí odkaz:
http://arxiv.org/abs/2405.20855
Publikováno v:
Eur. Phys. J. Plus 139, 152 (2024)
This paper investigates certain aspects of the CPT-odd photon sector of the minimal Standard Model Extension (SME) in the presence of a perfectly conducting plate (perfect mirror). The considered sector is described by Carroll-Field-Jackiw (CFJ) elec
Externí odkaz:
http://arxiv.org/abs/2402.04133
Publikováno v:
Eur.Phys.J.Plus 138 (2023) 12, 1079
Recently it was suggested that the Unruh effect might occur in metamaterials at accessible Unruh temperatures. In some cases, the class of metamaterials that may be useful for this observation has a Klein instead of a Minkowski signature. Thus, confi
Externí odkaz:
http://arxiv.org/abs/2312.06611
We consider nonlinear wave structures described by the modified Korteweg-de Vries equation with taking into account a small Burgers viscosity for the case of step-like initial conditions. The Whitham modulation equations are derived which include the
Externí odkaz:
http://arxiv.org/abs/2308.09353
Publikováno v:
Eur. Phys. J. Plus 139, 90 (2024)
Investigating quantum effects arising from high loops in perturbation theory is crucial for the physical applications of any quantum field theory. This paper presents a comprehensive analysis of the two-loop renormalization of CPT-even Lorentz-violat
Externí odkaz:
http://arxiv.org/abs/2306.08488
Problems with the concordance cosmology $\Lambda$CDM as the cosmological constant problem, coincidence problems and Hubble tension has led to many proposed alternatives, as the $\Lambda(t)$CDM, where the now called $\Lambda$ cosmological term is allo
Externí odkaz:
http://arxiv.org/abs/2305.18591
Publikováno v:
Phys. Rev. D 107, 115002 (2023)
In this work, we formulate the theory of Lorentz-violating scalar Quantum Chromodynamics with an arbitrary non-Abelian gauge group. This theory belongs to the class of models encompassed by the standard model extension framework. At the lowest order
Externí odkaz:
http://arxiv.org/abs/2304.03025
Publikováno v:
Proceedings of the Ninth Meeting on CPT and Lorentz Symmetry, pp. 259-262 (2023)
We purpose a study a Lorentz-breaking extension of the scalar QED. We calculate the contributions in the Lorentz-violating parameters to the two-point functions of scalar and gauge fields. We found that the two background tensors, coming from the two
Externí odkaz:
http://arxiv.org/abs/2212.09504
Publikováno v:
Phys. Rev. D 107, 045005 (2023)
The renormalization of quantum field theories usually assumes Lorentz and gauge symmetries, besides the general restrictions imposed by unitarity and causality. However, the set of renormalizable theories can be enlarged by relaxing some of these ass
Externí odkaz:
http://arxiv.org/abs/2211.11399