Newsletter on Black Holes Research: September-2018

Einstein’s general relativity confirmed near a black hole

Observations created with ESO’s terribly massive Telescope have for the primary time clearly unconcealed the results of Einstein’s Einstein’s theory of relativity on the motion of a star passing through the acute force field terribly getting ready to the supermassive part within the center of the Milky Way Galaxy. This long-sought result represents the climax of a 26-year-long observation campaign victimization ESO’s telescopes in Chile. [1]

Hawking radiation from cubic and quartic black holes via tunneling of GUP corrected scalar and fermion particles

We analyzed the impact of the generalized uncertainty (GUP) principle on the Hawking radiation from the furry part in U(1) gauge-invariant scalar-vector-tensor theory by utilizing the semiclassical Hamilton-Jacobi methodology. To do so, we tend to assess the tunneling chances and Hawking temperature for scalar and particle particles for the given part with cuboid and biquadrate interactions. For this purpose, we tend to utilize the changed Klein-Gordon equation for bosons and additionally nuclear physicist equations for fermions, severally. [2]

Overcharging black holes and cosmic censorship in Born-Infeld gravity

The Born-Infeld gravity may be a modification of the speculation of relativity theory impressed by the nonlinear Born-Infeld electrodynamics. The theory is described by a series of higher curvature terms added to the Einstein-Hilbert action with the parameter κ. The Born-Infeld gravity has many attention-grabbing actual neutral and charged part solutions. we have a tendency to study the matter of overcharging extremal part solutions of Born-Infeld gravity employing a charged take a look at a particle to form a naked singularity. [3]

Exotic renormalization group flows from black holes

In this thesis, we tend to construct a spread of region solutions that have coplanar horizons and area unit asymptotically Anti-de Sitter, therefore relevant within the context of the gauge/gravity correspondence. we tend to use the correspondence to research the renormalization cluster flows of the corresponding twin field theories. Our solutions break translations on one or a lot of spacial directions of the twin theory, therefore creating them appropriate for describing lattices in the powerfully coupled matter. once a short introduction to the gauge/gravity duality, 3 totally different set-ups area unit thought-about. First, within the context of sort IIB supergravity, our solutions area unit twin to anisotropic plasmas that arise from deforming associate degree infinite family of CFTs. Second, we tend to construct black holes in D = eleven supergravities, creating our solutions relevant for ABJM theory. and at last, we tend to take a bottom-up approach, coming up with a gravity model that the region solutions permit the United States to model fascinating part transitions that area unit triggered by the sturdy breaking of change of location unchangeableness. [4]

Characteristics of Spinning Black Holes

Aims: The present paper derives an expression for the frequency or wavelength of Hawking radiation emitted by spinning black holes in terms of the event horizon (λ=16πRs & v =c/16πRs), once the scientific theory of radiation ( E=hv ), energy of Hawking radiation and event horizon of the spinning black holes ( Rs = GM/c2 ) ar used. This frequency or wavelength of Hawking radiation may be regarded as the characteristics of spinning black holes and this work is extended to derive an expression for the change in the frequency of Hawking radiation with respect to the radius of the event horizon (v / Rs = – c / 16πRs2).

Study Design: The secondary data for the frequencies and wavelengths of Hawking radiation has been calculated from the primary data of rest masses for stellar – mass black holes (M ~ 5 ­ 20 Mʘ) in XRBs and (M ~ 106 – 109.5 Mʘ) in AGN resulting the wavelength( λ = 16πRs) & and frequency (v = c / 16πRs). Our result corresponds to the results of analysis work entitled: Frequency of Hawking radiation from black holes by Mahto et al. revealed in International Journal of uranology and area Science (2013). [5]

Reference

[1] Einstein’s general relativity confirmed near a black hole

Date: July 30, 2018, Source: University of Cologne (web link)

[2] Hawking radiation from cubic and quartic black holes via tunneling of GUP corrected scalar and fermion particles

Javed W, Babar R, Övgün A. Hawking radiation from cubic and quartic black holes via tunneling of GUP corrected scalar and fermion particles. arXiv preprint arXiv:1808.09795. 2018 Aug 9. (web link)

[3] Overcharging black holes and cosmic censorship in Born-Infeld gravity

Jana S, Shaikh R, Sarkar S. Overcharging black holes and cosmic censorship in Born-Infeld gravity. arXiv preprint arXiv:1808.09656. 2018 Aug 29. (web link)

[4] Exotic renormalization group flows from black holes

SOSA-RODRIGUEZ OM. Exotic renormalization group flows from black holes (Doctoral dissertation, Durham University). (web link)

[5] Characteristics of Spinning Black Holes

Dipo Mahto1* and Alok Ranjan2

1Department of Physics, Marwari College, T.M.B.U, Bhagalpur, India.

2Research Scholar, Department of Physics, T.M.B.U, Bhagalpur, India. (web link)

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