PROBING PRIMORDIAL MAGNETIC FIELDS USING Lyα CLOUDS

Pandey, Kanhaiya L.; Sethi, Shiv K.

doi:10.1088/0004-637x/762/1/15

Cited by 51 publications

(58 citation statements)

References 59 publications

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“…It falls shortly below the interval for the B-field given by Pandey et al [7] for primordial magnetic field lines using Lyα clouds. Actually, recently Banerjee [8] has informed us that values of B-field as low as 10 −32 G may also seed galactic dynamos.…”

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confidence: 56%

Corrigendum: Astrophysical and terrestrial probes to test Einstein–Cartan gravity (2001 Class. Quantum Grav. 18 3907)

Andrade¹

2014

Class. Quantum Grav.

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This is a corrigendum for the paper under the title above and whose reference is Garcia de Andrade (2001 Class. Quantum Grav. 18 3907). In this paper, a wrong formula (44) between the proportionality between the magnetic field of a spin-polarized cylinder in Einstein-Cartan-Maxwell gravity and the spinpolarized density or Cartan spacetime torsion, is corrected. This correction is shown to produce several interesting physical consequences as that this spinpolarized cylinder produces a primordial magnetic field B ∼ 10 −22 G which is able to seed galactic dynamos. The mistake does not modify the external metric to the string-like configuration. Several important physical consequences may come out from this correction.Keywords: torsion, dynamos, strings, Einstein-Cartan gravity, cosmology Earlier the author published a paper in CQG [1] where spin-polarized cylinders with magnetic fields were used as a tool to test Einstein-Cartan theory of gravitation [2]. Unfortunately, recently we have discovered an important mistake in two formulas which we hereby correct. The importance of this correction is proved through an example on the computation of the primordial magnetic field on this string-like source which is shown to yield a seed magnetic field able to produce galactic magnetic fields from galactic dynamo mechanism [3], as recently discussed by this author [4]. The basic reason for this is the fact that the mistake is exactly in formulas (43) and (44), of that paper, which we repeat here as 0264-9381/14/079501+03$33.00

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confidence: 56%

Corrigendum: Astrophysical and terrestrial probes to test Einstein–Cartan gravity (2001 Class. Quantum Grav. 18 3907)

Andrade¹

2014

Class. Quantum Grav.

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“…Note when this paper was in the final stage of preparation, Pandey & Sethi (2013) showed that magnetic fields can be strongly constrained by first object formation, in particular through Lyα data.…”

Section: The Cmb Faraday Rotation Effectmentioning

confidence: 99%

“…In the present investigation we focus on the thermal Sunyaev-Zel'dovich (tSZ) effect, the cluster number density, and Lyα data. The large-scale-based tests, such as tSZ, Lyα, cosmic shear (gravitational lensing), and X-ray cluster surveys, have been studied in Shaw & Lewis (2012), Tashiro & Sugiyama (2011), Tashiro et al (2012, Fedeli & Moscardini (2012), and Pandey & Sethi (2013), but again in the context of a smoothed magnetic field. Another possible observational signature of large-scale correlated cosmological magnetic fields may be found in cosmic-ray acceleration and corresponding gamma ray signals (see Essey et al 2012 and references therein).…”

Section: Introductionmentioning

confidence: 99%

Constraining Primordial Magnetic Fields Through Large-Scale Structure

Kahniashvili

Maravin

Natarajan

et al. 2013

ApJ

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We study primordial magnetic field effects on the matter perturbations in the universe. We assume magnetic field generation prior to the big bang nucleosynthesis (BBN), i.e., during the radiation-dominated epoch of the universe expansion, but do not limit analysis by considering a particular magnetogenesis scenario. Contrary to previous studies, we limit the total magnetic field energy density and not the smoothed amplitude of the magnetic field at large (of the order of 1 Mpc) scales. We review several cosmological signatures, such as halo abundance, thermal Sunyaev-Zel'dovich effect, and Lyα data. For a cross-check, we compare our limits with that obtained through the cosmic microwave background faraday rotation effect and BBN. The limits range between 1.5 nG and 4.5 nG for n B ∈ (−3; −1.5).

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“…The PMF effects on the cosmological density fields or the matter power spectrum (MPS), also, are studied by the many authors [35,52,56,[73][74][75][76][77][78][79][80][81][82]. References [73][74][75][76] groundbreaking analytical research on the effects of the first order perturbations source from PMFs on the MPS.…”

Section: Introductionmentioning

confidence: 99%

Evolution of the cosmic matter density field with a primordial magnetic field

Yamazaki

2016

Phys. Rev. D

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A cosmological magnetic field affects the time evolution of the cosmic matter density field. The squared Alfven velocity of the cosmic fluid is proportional to an ensemble average energy density of a primordial magnetic field (PMF), and it prevents the matter density field from collapsing in the horizon scale. The matter-radiation equality time also is delayed by the presence of an ensemble average energy density of a PMF. The ensemble average energy density of the PMF also affects the matter power spectrum (MPS) through the Meszaros effect and the potential decay. Since the ensemble average energy density of the PMF is not a first order perturbation but a zero order source in the linear perturbation equations for the cosmology, to correctly understand the overall effects of the PMF on the MPS, we should significantly revise previous approaches to research for the MPS with the PMF by considering the both effects of the zero and first order sources from the PMF in the linear perturbation theory. We apply the effects of the zero order sources from the PMF to theoretical computations of the MPS for the first time. We also analyze the overall PMF effects on the MPS. The CMB polarizations are affected the weak lensing. The weak lensing is determined by the MPS. Therefore, we have to consider the zero order sources of the PMF to gain a correct understanding not only of the MPS but also the CMB polarization. * yamazaki.dai@nao.ac.jp 2

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PROBING PRIMORDIAL MAGNETIC FIELDS USING Lyα CLOUDS

Cited by 51 publications

References 59 publications

Corrigendum: Astrophysical and terrestrial probes to test Einstein–Cartan gravity (2001 Class. Quantum Grav. 18 3907)

Corrigendum: Astrophysical and terrestrial probes to test Einstein–Cartan gravity (2001 Class. Quantum Grav. 18 3907)

Constraining Primordial Magnetic Fields Through Large-Scale Structure

Evolution of the cosmic matter density field with a primordial magnetic field

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