Exploring tidal force effects and shadow constraints for Schwarzschild-like black hole in Starobinsky–Bel-Robinson gravity

Arora, Dhruv; Molla, Niyaz Uddin; Chaudhary, Himanshu; Debnath, Ujjal; Atamurotov, Farruh; Mustafa, G.

doi:10.1140/epjc/s10052-023-12185-4

Cited by 24 publications

(2 citation statements)

References 77 publications

(95 reference statements)

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“…By employing equations ( 16) and (17), we investigated the angular diameter of the black hole shadow as a function of the parameter μ, while maintaining the parameters g = 0.2 and q = 0.3 fixed, within a 1-σ confidence region [97,98], as illustrated in figure 2. Our investigation into the angular diameter of the black hole shadow focuses on supermassive black holes, specifically M87 * with mass and distance from Earth approximately M ≈ 6.5 × 10 9 M e and D ol ≈ 16.8 Mpc respectively, and SgrA * with mass and distance from Earth approximately M ≈ 4.28 × 10 6 M e and D ol ≈ 8.32 kpc respectively.…”

Section: Shadows Of Modified Bardeen Black Holementioning

confidence: 99%

Investigating the shadows and strong gravitational lensing of modified Bardeen black holes

Molla,

Ali,

Debnath

et al. 2024

Phys. Scr.

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This study is dedicated to exploring the distinctive observational features affected by the modified Bardeen black hole through meticulous analysis of its shadow and strong gravitational lensing observations. We thoroughly investigated the impact of the black hole's parameters q, g and $\mu$ on its shadow radius through numerical simulations and graphical representations. Utilizing the Event Horizon Telescope (EHT) data, we constrained the parameters $q$ and $\mu$ of the modified Bardeen black hole within specific ranges: $-1.24 M^2\leq \mu \leq 8M^2$ and $0\leq |q|\leq 1.38M $ for $M87^*$; and $-3.52 M^2\leq \mu \leq 19.6M^2$ and $0\leq |q|\leq 0.8M $ for $Sgr A^*$, while maintaining the fixed value $g=0.4M$. This restriction of the ($\mu$, $q$) parameter space by the EHT findings illustrates the viability of modified Bardeen black holes as astrophysical candidates. Additionally, we study strong gravitational lensing and its various observables for the modified Bardeen black hole, comparing its behavior to other astrophysical black holes such as the Schwarzschild ($\mu=0=q$) and Bardeen ($\mu=0$) black holes. By examining the astrophysical ramifications through strong gravitational lensing, considering supermassive black holes at the center of nearby galaxies, we uncovered that the modified Bardeen black hole exhibits distinct characteristics, offering a quantitative distinction from other black holes such as the Schwarzschild and Bardeen black holes. These findings in astrophysical consequences provide a promising pathway to differentiate the modified black hole from its counterparts in the realm of general relativity.

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Section: Shadows Of Modified Bardeen Black Holementioning

confidence: 99%

Investigating the shadows and strong gravitational lensing of modified Bardeen black holes

Molla,

Ali,

Debnath

et al. 2024

Phys. Scr.

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“…Recent work on tidal forces in different types of spacetime geometries is discussed in [25][26][27][28]. When an object falls freely towards the spacetime center in Schwarzschild spacetime, it always experiences compression in the angular direction and stretching in the radial direction.…”

Section: Introductionmentioning

confidence: 99%

First detection of SARS-CoV-2 Delta variant (B.1.617.2) in the wastewater of (Ahmedabad), India

Joshi

Kumar

Srivastava

et al. 2021

Preprint

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Contrary to the conventional genomic surveillance based on clinical samples (symptomatic patients), the wastewater-based genomic surveillance can identify all the variants shed by the infected individuals in the population, as it does also include RNA fragmented shredded by clinically escaped asymptomatic patients. We analyzed four samples to detect key mutations in the SARS-CoV-2 genome and track circulating variants in Ahmedabad during the first wave (Sep/ Nov 2020) and before the second wave (in Feb 2021) of COVID-19 in India. The analysis showed a total of 35 mutations in the spike protein across four samples categorized into 23 types. We noticed the presence of spike protein mutations linked to the VOC-21APR-02; B.1.617.2 lineage (Delta variant) with 57% frequency in wastewater samples of Feb 2021. The key spike protein mutations were T19R, L452R, T478K, D614G, & P681R and deletions at 22029 (6 bp), 28248 (6 bp), & 28271 (1 bp). Interestingly, these mutations were not observed in the samples of Sep and Nov 2020 but appeared before the devastating second wave of COVID-19, which started in early April 2021 in India, caused rapid transmission and deaths all over India. We found the genetic traces of the B.1.617.2 in samples of early Feb 2021 i.e., more than a month before the first clinically confirmed case of the same variant in March 2021 in Ahmedabad, Gujarat. The present study tells about the circulating variants in Ahmedabad and suggests early prediction VOCs employing the wastewater genomic surveillance approach that must be exploited at a large scale for effective COVID-19 management.HighlightsWhole-genome sequencing of SARS-CoV-2 from the WW samples was carried out.Variant of Concern (VoC: VOC-21APR-02; B.1.617.2) were detected in WW samples.WBE may detect prevalent SARS-CoV-2 variants and monitor their cryptic transmissionWW genomic surveillance can aid the decision-making system for public health policies.

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Black hole solutions to Einstein-Bel-Robinson gravity

Sajadi,

Mann,

Sheikhahmadi

et al. 2024

J. High Energ. Phys.

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In this paper, we study the physical properties of black holes in the framework of the recently proposed Einstien-Bel-Robinson gravity. We show that interestingly the theory propagates a transverse and massless graviton on a maximally symmetric background with positive energy. There is also a single ghost-free branch that returns to the Einstein case when β → 0. We find new black hole solutions to the equations, both approximate and exact, the latter being a constant curvature black hole solution, and discuss inconsistencies with metrics that were previously claimed to be approximate solutions to the equations. We obtain the conserved charges of the theory and briefly study the thermodynamics of the black hole solutions.

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Exploring tidal force effects and shadow constraints for Schwarzschild-like black hole in Starobinsky–Bel-Robinson gravity

Cited by 24 publications

References 77 publications

Investigating the shadows and strong gravitational lensing of modified Bardeen black holes

Investigating the shadows and strong gravitational lensing of modified Bardeen black holes

First detection of SARS-CoV-2 Delta variant (B.1.617.2) in the wastewater of (Ahmedabad), India

Black hole solutions to Einstein-Bel-Robinson gravity

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