Accretion onto a noncommutative geometry inspired black hole

Kumar, Rahul; Ghosh, Sushant G.

doi:10.1140/epjc/s10052-017-5141-x

Cited by 18 publications

(7 citation statements)

References 40 publications

(76 reference statements)

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“…In string theory the scalar wave scattering by spherically symmetric d-dimensional black holes has also been analyzed [35]. In [36,37] the authors considering a noncommutative Schwarzschild black hole have explored the effect of the noncommutativity on the matter accretion rate.…”

Section: Introductionmentioning

confidence: 99%

Absorption and scattering of a noncommutative black hole

et al. 2020

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In this paper we aim to investigate the process of massless scalar wave scattering due to a self-dual black hole through the partial wave method. We calculate the phase shift analytically at the low energy limit and we show that the dominant term of the differential cross section at the small angle limit is modified by the presence of parameters related to the polymeric function and minimum area of a self-dual black hole. We also find that the result for the absorption cross section is given by the event horizon area of the self-dual black hole at the low frequency limit. We also show that, contrarily to the case of a Schwarzschild black hole, the differential scattering/absorption cross section of a self-dual black hole is nonzero at the zero mass limit. In addition, we verify these results by numerically solving the radial equation for arbitrary frequencies.

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Section: Introductionmentioning

confidence: 99%

Absorption and scattering of a noncommutative black hole

et al. 2020

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“…In recent years, various properties of NC gravity have been the focus of studies by several authors. These studies include, for example, charged solution of the NCi BH and polytropic fluid matter accretion onto the NCi BH [14,15], Chandrasekhar mass-limit for white dwarfs in the frame of NC gravity [16], rotating NCi BH solution and NCi BH solution in 4D Einstein Gauss Bonnet gravity [17,18], the effects of NC parameter on gravitational measurements such as redshift, deflection, and time delay of light [19], the quasinormal modes of massless scalar field perturbation in NC gravity [20], gravitational lensing and shadow of the NCi BHs [21,22], and quantum tunnel effects of NCi Schwarzschild BHs [23].…”

Section: Introductionmentioning

confidence: 99%

Quasiperiodic oscillations from noncommutative inspired black holes

Rayimbaev

Bokhari

Ahmedov

2022

Class. Quantum Grav.

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We investigate the dynamics of test particles in the spacetime of noncommutative inspired black holes (NCi BHs). In this context, we first analyse spacetime properties of the NCi BHs together with innermost stable circular orbits (ISCOs) for the particles. It is observed that whereas the ISCO radius does not depend on the NC parameter, the frequencies of the Keplerian orbits and harmonic oscillations are NC parameter dependent. As an application, we consider quasiperiodic oscillations (QPOs) to test effects of the NC gravity around the BHs using twin-peak QPOs frequencies. It is found that the frequency changes even in the presence of the critical NC parameter are smaller than the error in the frequency measurements. The method developed for testing gravity using data from twin peak QPOs may also be applied to other alternate theories of gravity to obtain restrictions on the central BH parameters. We show that the orbits of QPOs lie near ISCO. This assumption may be helpful in solving the ISCO measurement problems in astrophysical observations. In addition, we determine the mass of the central BH in microquasar GRS 1915-105 and the QPO orbit in both the relativistic precession and warped disk models. It is shown that these parameters do not depend on the quantum corrections in the NC gravity. Lastly, we investigate the gravitational capture cross-section for photons and show that the effect of the NC parameter is also less than the error in shadow measurements of the supermassive BH (SMBH) Messier 87 (M87).

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“…A popular way of proposing NC is by defining x i , x j = iη and p i , p j = iθ with η and θ being the NC parameters. It was shown that in the presence of NC, the spacetime metric alters [37], causing the event horizon to shift and the singularity at the centre of a black hole to vanish, which is replaced by a regular de-Sitter core [38][39][40]. It further alters some other properties associated with black holes, such as the stability of Cauchy horizon [41], mini black hole formation with the central singularity replaced by a self-gravitating droplet [42], the Hawking temperature [43].…”

Section: Introductionmentioning

confidence: 99%

Massive Neutron Stars and White Dwarfs as Noncommutative Fuzzy Spheres

Kalita

Mukhopadhyay

2022

Universe

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Over the last couple of decades, there have been direct and indirect evidences for massive compact objects than their conventional counterparts. A couple of such examples are super-Chandrasekhar white dwarfs and massive neutron stars. The observations of more than a dozen peculiar over-luminous type Ia supernovae predict their origins from super-Chandrasekhar white dwarf progenitors. On the other hand, recent gravitational wave detection and some pulsar observations provide arguments for massive neutron stars, lying in the famous mass-gap between lowest astrophysical black hole and conventional highest neutron star masses. We show that the idea of a squashed fuzzy sphere, which brings in noncommutative geometry, can self-consistently explain either of the massive objects as if they are actually fuzzy or squashed fuzzy spheres. Noncommutative geometry is a branch of quantum gravity. If the above proposal is correct, it will provide observational evidences for noncommutativity.

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Accretion onto a noncommutative geometry inspired black hole

Cited by 18 publications

References 40 publications

Absorption and scattering of a noncommutative black hole

Absorption and scattering of a noncommutative black hole

Quasiperiodic oscillations from noncommutative inspired black holes

Massive Neutron Stars and White Dwarfs as Noncommutative Fuzzy Spheres

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