inhomogeneous universe
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2021 ◽  
Vol 81 (9) ◽  
Author(s):  
M. Z. Bhatti ◽  
Z. Yousaf ◽  
F. Hussain

AbstractThe objective of this article is to investigate the effects of electromagnetic field on the generalization of Lemaître–Tolman–Bondi (LTB) spacetime by keeping in view the Palatini f(R) gravity and dissipative dust fluid. For performing this analysis, we followed the strategy deployed by Herrera et al. (Phys Rev D 82(2):024021, 2010). We have explored the modified field equations along with kinematical quantities and mass function and constructed the evolution equations to study the dynamics of inhomogeneous universe along with Raychauduary and Ellis equations. We have developed the relation for Palatini f(R) scalar functions by splitting the Riemann curvature tensor orthogonally and associated them with metric coefficients using modified field equations. We have formulated these scalar functions for LTB and its generalized version, i.e., GLTB under the influence of charge. The properties of GLTB spacetime are consistent with those of the LTB geometry and the scalar functions found in both cases are comparable in the presence of charge and Palatini f(R) curvature terms. The symmetric properties of generalized LTB spacetime are also studied using streaming out and diffusion approximations.



2021 ◽  
Vol 103 (8) ◽  
Author(s):  
Chi Tian ◽  
Stefano Anselmi ◽  
Matthew F. Carney ◽  
John T. Giblin ◽  
James Mertens ◽  
...  


2021 ◽  
pp. 135-156
Author(s):  
Scott Dodelson ◽  
Fabian Schmidt


2021 ◽  
pp. 111-133
Author(s):  
Scott Dodelson ◽  
Fabian Schmidt


2020 ◽  
Vol 125 (22) ◽  
Author(s):  
Andrea Caputo ◽  
Hongwan Liu ◽  
Siddharth Mishra-Sharma ◽  
Joshua T. Ruderman


2020 ◽  
Vol 102 (10) ◽  
Author(s):  
Andrea Caputo ◽  
Hongwan Liu ◽  
Siddharth Mishra-Sharma ◽  
Joshua T. Ruderman


2020 ◽  
Vol 2020 (10) ◽  
pp. 011-011 ◽  
Author(s):  
Andrés Arámburo García ◽  
Kyrylo Bondarenko ◽  
Sylvia Ploeckinger ◽  
Josef Pradler ◽  
Anastasia Sokolenko


2020 ◽  
Vol 495 (3) ◽  
pp. 2607-2619 ◽  
Author(s):  
S P O’Sullivan ◽  
M Brüggen ◽  
F Vazza ◽  
E Carretti ◽  
N T Locatelli ◽  
...  

ABSTRACT Measuring the properties of extragalactic magnetic fields through the effect of Faraday rotation provides a means to understand the origin and evolution of cosmic magnetism. Here, we use data from the LOFAR Two-Metre Sky Survey (LoTSS) to calculate the Faraday rotation measure (RM) of close pairs of extragalactic radio sources. By considering the RM difference (ΔRM) between physical pairs (e.g. double-lobed radio galaxies) and non-physical pairs (i.e. close projected sources on the sky), we statistically isolate the contribution of extragalactic magnetic fields to ΔRM along the line of sight between non-physical pairs. From our analysis, we find no significant difference between the ΔRM distributions of the physical and non-physical pairs, limiting the excess Faraday rotation contribution to <1.9 rad m−2 (${\sim}95{{\ \rm per\ cent}}$ confidence). We use this limit with a simple model of an inhomogeneous universe to place an upper limit of 4 nG on the cosmological co-moving magnetic field strength on Mpc scales. We also compare the RM data with a more realistic suite of cosmological magnetohydrodynamical simulations that explore different magnetogenesis scenarios. Both magnetization of the large-scale structure by astrophysical processes such as galactic and AGN outflows, and simple primordial scenarios with seed magnetic field strengths <0.5 nG cannot be rejected by the current data; while stronger primordial fields or models with dynamo amplification in filaments are disfavoured.



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