Quarks, Hadrons, and Emergent Spacetime

Żenczykowski, P.

doi:10.1007/s10699-018-9562-2

Cited by 11 publications

(19 citation statements)

References 34 publications

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“…However, there is no strong justification for such belief. The 'Planck scale' (be it energy, length or density) arises only from geometric arguments involving fundamental constants and there is no physical guarantee that quantum-gravity effects must not appear at other scales [62]. In fact, it has become clear in recent times, studying dynamical solutions leading to the formation of black holes, that one can not affect the behaviour of collapse close to the Planck regime (i.e.…”

Section: Introductionmentioning

confidence: 99%

Black hole mimicker hiding in the shadow: Optical properties of the γ metric

et al. 2019

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Can the observation of the 'shadow' allow us to distinguish a black hole from a more exotic compact object? We study the motion of photons in a class of vacuum static axially-symmetric space-times that is continuously linked to the Schwarzschild metric through the value of one parameter that can be interpreted as a measure of the deformation of the source. We investigate the lensing effect and shadow produced by the source with the aim of comparing the expected image with the shadow of a Schwarzschild black hole. In the context of astrophysical black holes we found that it may not be possible to distinguish an exotic source with small deformation parameter from a black hole. However, as the deformation increases noticeable effects arise. Therefore, the future more precise measurement of the shadow of astrophysical black hole candidates would in principle allow to put constraints on the deviation of the object from spherical symmetry.

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Section: Introductionmentioning

confidence: 99%

Black hole mimicker hiding in the shadow: Optical properties of the γ metric

et al. 2019

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“…= 0.34 × 10 −24 g, is of the order of nucleon or pion mass [6]. The above observation that there is a set of four basic mass scales (m P , m W , m U , and m N ) that can be obtained through dimensional analysis by omitting one of the four fundamental constants was made earlier in [7].…”

Section: Milgrommentioning

confidence: 88%

“…Thus, it may well be that the distance scale at which the quantum nature of space becomes manifest is dynamical and much larger than l P [5] (and the related mass scale -much smaller than m P ). With space regarded as an attribute (or a derivative) of matter, it may even be claimed that it is physics at hadronic (or, more generally speaking, elementary particle) scales that should direct our ideas on the quantization of space [6]. In spite of such caveats, dimensional analysis certainly provides us with important hints on the Unknown.…”

Section: From Stoney To Planckmentioning

confidence: 99%

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MOND and natural scales of distance and mass

Żenczykowski

2019

Mod. Phys. Lett. A

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We describe a MOND-related approach to natural scales of distance and mass, viewing it as a logical step following Planck's modification of the Stoney system of units. The MOND-induced scales are not based on the strength of any physical interaction (electromagnetic, gravitational, or otherwise). Instead, they are specified by three physical constants of a general nature that define the scales of action, speed, and acceleration, ie. h -the Planck constant, c -the speed of light, and a M -the MOND acceleration constant. When the gravitational constant G is added, two further distance scales (apart from the size of the Universe) appear: the Planck scale and a nanometer scale that fits the typical borderline between the classical and the quantum descriptions.

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“…This belief may be questioned, due to the lack of experimental evidence and to the possible existence of other fundamental scales (e.g. [37]). Then it is possible to argue that deviations from classical GR may appear at density scales other than the Planck density.…”

Section: Introductionmentioning

confidence: 99%

Note on the mass–radius relations for spherical compact objects in general relativity with semi-classical corrections

Nussupbekov

Malafarina

2020

Eur. Phys. J. C

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We consider the effects that modifications to general relativity (GR) at high densities may have on the structure of spherical compact objects. Such effects can be modeled via semi-classical corrections that are manifest in an additional effective (i.e. non-physical) term in the energy momentum tensor. In particular, we consider two kinds of effective corrections that are quadratic in the density: one inspired by loop quantum gravity (LQG) and one inspired by Einstein-Cartan Theory (ECT). For both corrections, we consider two standard toy models of compact objects, one with polytropic equation of state and the other described by the MIT-bag model. We show that the LQG-inspired corrections can produce objects with greater radius and total mass, while the ECT-inspired corrections produce objects that are smaller and less massive than their counterparts in GR.

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Quarks, Hadrons, and Emergent Spacetime

Cited by 11 publications

References 34 publications

Black hole mimicker hiding in the shadow: Optical properties of the γ metric

Black hole mimicker hiding in the shadow: Optical properties of the γ metric

MOND and natural scales of distance and mass

Note on the mass–radius relations for spherical compact objects in general relativity with semi-classical corrections

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