Gravitoelectromagnetic inflation from a 5D vacuum state: A new formalism

Raya, Alfredo; Aguilar, José Edgar Madriz; Bellini, Mauricio

doi:10.1016/j.physletb.2006.05.068

Cited by 38 publications

(56 citation statements)

References 31 publications

(36 reference statements)

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“…magnetic fields evolves adiabatically from the end of inflation until today, due to the high electrical conductivity of the cosmic plasma. In this epoch the universe is thermalized, so that the comoving magnetic field decreases with the expansion to take actual values of the order of 10 −9 Gauss [19,24]. Notice that the results here obtained depends on the gauge A 0 = 0.…”

Section: Final Commentsmentioning

confidence: 61%

Primordial large-scale electromagnetic fields from gravitoelectromagnetic inflation

Membiela¹,

Bellini²

2009

Physics Letters B

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We investigate the origin and evolution of primordial electric and magnetic fields in the early universe, when the expansion is governed by a cosmological constant Λ0. Using the gravitoelectromagnetic inflationary formalism with A0 = 0, we obtain the power of spectrums for large-scale magnetic fields and the inflaton field fluctuations during inflation. A very important fact is that our formalism is naturally non-conformally invariant.

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Section: Final Commentsmentioning

confidence: 61%

Primordial large-scale electromagnetic fields from gravitoelectromagnetic inflation

Membiela¹,

Bellini²

2009

Physics Letters B

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“…In this way, we can single out the roots corresponding to the radius of black hole horizons and probe the effects of Weyl corrections on the horizons. In figure (1), we delineate the region I in the parameter space (α, q), within which the event horizon is existed for the spacetime (11). The solid line marks the upper limit on the charge q as a function of the coupling parameter α, for which the event horizon is still existed.…”

Section: A Static and Spherically Symmetric Charged Black Hole Wimentioning

confidence: 99%

“…This class is of great interest because the appearance of the nonminimal couplings in the Lagrangian modifies the coefficients of the second-order derivatives both in the Maxwell and Einstein equations, which could affect the propagation of gravitational and electromagnetic waves in the spacetime and may yield time delays in the arrival of those waves [5]. In the evolution of the early Universe, such a kind of coupled terms may result in electromagnetic quantum fluctuations and lead to the inflation [8][9][10][11][12]. Recent investigations also show that these cross-terms have been used as attempts to explain the large scale magnetic fields observed in clusters of galaxies [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Rotating charged black hole with Weyl corrections

Chen

Jing

2014

Phys. Rev. D

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We present firstly a four-dimensional spherical symmetric black hole with small Weyl corrections and find that with increasing Weyl corrections the region of the event horizon existence for the black hole in the parameter space increases for the negative Weyl coupling parameter and decreases for the positive one. Moreover, we also obtain a rotating charged black hole with weak Weyl corrections by the method of complex coordinate transformation. Our results show that the sign of Weyl coupling parameter α yields the different spatial topology of the event horizons for the black hole with its parameters lied in some special regions in the parameter space. We also analyze the dependence of the ergosphere on the Weyl coupling parameter α and find that with the increase of the Weyl corrections the ergosphere in the equatorial plane becomes thick for a black hole with α > 0, but becomes thin in the case with α < 0, which means that the energy extraction become easier in the background of a black hole with the positive Weyl coupling parameter, but more difficult in the background of a black hole with the negative one.

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“…However, as a quantum phenomenon, the strength of the effects is immeasurably small in this low energy effective theory since the coupling constants are very small and are of the order of the square of the Compton wave length of the electron. Recently, the extended theoretical models without the small coupling constant limit have been investigated for some physical motivations [30][31][32][33][34][35][36][37][38][39][40][41][42][43][44][45][46][47]. The optical behaviors of the coupled photons in the extended Weyl correction model have been studied in the strong field region [48,49], which shows that the measurement of relativistic images and time delay in the strong field can provide a mechanism to detect the polarization direction of coupled photons.…”

Section: Introductionmentioning

confidence: 99%

Double shadow of a regular phantom black hole as photons couple to the Weyl tensor

2016

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We have studied the shadow of a regular phantom black hole as photons couple to the Weyl tensor. We find that due to the coupling photons with different polarization directions propagate along different paths in the spacetime so that there exists a double shadow for a black hole, which is quite different from that in the non-coupling case where only a single shadow emerges. The overlap region of the double shadow, the umbra, of the black hole increases with the phantom charge and decreases with the coupling strength. The dependence of the penumbra on the phantom charge and the coupling strength is converse to that of the umbra. Combining with the supermassive central object in our Galaxy, we estimated the shadow of the black hole as the photons couple to the Weyl tensor. Our results show that the coupling brings about richer behaviors of the propagation of coupled photon and the shadow of the black hole in the regular phantom black hole spacetime.

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Gravitoelectromagnetic inflation from a 5D vacuum state: A new formalism

Abstract: We propose a novel formalism for inflation from a 5D vacuum state which could explain both, seeds of matter and magnetic fields in the early universe. *

Cited by 38 publications

References 31 publications

Primordial large-scale electromagnetic fields from gravitoelectromagnetic inflation

Primordial large-scale electromagnetic fields from gravitoelectromagnetic inflation

Rotating charged black hole with Weyl corrections

Double shadow of a regular phantom black hole as photons couple to the Weyl tensor

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