scholarly journals Ultimate Unification: Gravity-led Democracy vs. Uber-Symmetries

2020 ◽  
Author(s):  
Stephane Maes
Keyword(s):  
Black Holes ◽  
Magnetic Monopoles ◽  
Massive Gravity ◽  
Small Scale ◽  
Symmetry Groups ◽  
Symmetric State ◽  
Charged Black Holes ◽  
Small Scales ◽  
Real Universe

In this paper, we start from conventional GUTs and ToEs and discuss their challenges due not only to the lack of observations of proton decays and magnetic monopoles, but also to the fact that when gravity is considered, especially with mechanisms à la multi-folds, where gravity emerges from entanglement, both these phenomena are expected to not exist. With only a few exception, ToEs are badly hurt, including many superstrings, and most GUTs are knocked out. Because of the massive gravity at small scale contributed by entanglement in a multi-fold universe, we encounter new lifecycles for charged black holes and discover that, at small scales, gravity is no more the weakest interaction. In fact, sources and carriers of all interactions democratically carry gravity along with their interaction the same way and all interactions have similar strength. It becomes a new symmetric state with an Ultimate Unification of all the forces, but without the hierarchies of symmetry groups typically involved in GUTs, and without intermediate GUTs not involving gravity from the get-go. These results are obtained in a multi-fold universe, but with discussions of what can be said about our real universe.

Chiral asymmetries in near-horizon region of charged black hole and teleparallelism

2021 ◽  
pp. 2150073
Author(s):  
L. C. Garcia de Andrade
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
Magnetic Monopoles ◽  
Charged Black Hole ◽  
Kerr Spacetime ◽  
Charged Black Holes ◽  
Physical Information ◽  
Quantum Anomalies ◽  
Spacetime Metric

The issue of encoding physical information into metric structure of physical theories has been discussed recently by the author in the case of black hole teleparallelism. In this paper, one obtains a teleparallel chiral currents from quantum anomalies and topological torsional invariants of Nieh-Yan type. The Pontryagin index is also obtained in the case of rotating Kerr spacetime metric of non-static black holes. Magnetic monopoles which appears in this approach can be eliminated by a torsion constraint. These ideas are applied to Kerr and Kerr–Newmann charged black holes.

scholarly journals Charged black holes in new massive gravity

2011 ◽  
Vol 695 (1-4) ◽  
pp. 359-364 ◽  
Author(s):  
Ahmad Ghodsi ◽  
Mohammad Moghadassi
Keyword(s):  
Black Holes ◽  
Massive Gravity ◽  
Charged Black Holes

Nonlinearly charged black holes surrounded by cloud of strings and quintessence in Einstein-Massive gravity

2021 ◽  
pp. 2150184
Author(s):  
Askar Ali
Keyword(s):  
Black Holes ◽  
Heat Capacity ◽  
Black Hole Solution ◽  
Massive Gravity ◽  
Thermodynamic Quantities ◽  
First Law Of Thermodynamics ◽  
Charged Black Holes ◽  
Stability And Instability ◽  
Set Up ◽  
Electrically Charged

In this work, a new model of double-Logarithmic electrodynamics has been minimally coupled to Einstein-massive gravity and the nonlinearly charged black holes in the presence of quintessential cosmic dark energy and string cloud background are investigated. In this set up, new magnetically charged black hole solution has been derived. Thermodynamics of these black holes are also analyzed and different thermodynamic quantities are computed. Basic thermodynamic quantities such as heat capacity and Hawking temperature have been plotted and the regions corresponding to thermodynamic stability and instability are pointed out. The generalized first law of thermodynamics and the associated Smarr’s relation have also been written down in this context of massive gravity and matter sources. At last, the nonlinearly electrically charged black holes are also briefly studied.

scholarly journals Charged black holes in nonlinear massive gravity

2013 ◽  
Vol 87 (6) ◽  
Author(s):  
Yi-Fu Cai ◽  
Damien A. Easson ◽  
Caixia Gao ◽  
Emmanuel N. Saridakis
Keyword(s):  
Black Holes ◽  
Massive Gravity ◽  
Charged Black Holes

scholarly journals Phase transition of charged black holes in massive gravity through new methods

2016 ◽  
Vol 528 (11-12) ◽  
pp. 819-834 ◽  
Author(s):  
S. H. Hendi ◽  
S. Panahiyan ◽  
B. Eslam Panah ◽  
M. Momennia
Keyword(s):  
Phase Transition ◽  
Black Holes ◽  
Massive Gravity ◽  
Charged Black Holes ◽  
New Methods

scholarly journals Critical Solutions of Scalarized Black Holes

Symmetry ◽  
2020 ◽  
Vol 12 (12) ◽  
pp. 2057
Author(s):  
Jose Luis Blázquez-Salcedo ◽  
Sarah Kahlen ◽  
Jutta Kunz
Keyword(s):  
Black Holes ◽  
Scalar Field ◽  
Critical Value ◽  
Magnetic Monopoles ◽  
Space Time ◽  
Quartic Coupling ◽  
Charged Black Holes ◽  
Hairy Black Holes ◽  
Domain Of Existence ◽  
Scalar Hair

We consider charged black holes with scalar hair obtained in a class of Einstein–Maxwell– scalar models, where the scalar field is coupled to the Maxwell invariant with a quartic coupling function. Besides the Reissner–Nordström black holes, these models allow for black holes with scalar hair. Scrutinizing the domain of existence of these hairy black holes, we observe a critical behavior. A limiting configuration is encountered at a critical value of the charge, where space time splits into two parts: an inner space time with a finite scalar field and an outer extremal Reissner–Nordström space time. Such a pattern was first observed in the context of gravitating non-Abelian magnetic monopoles and their hairy black holes.

scholarly journals Small-scale primordial fluctuations in the 21cm Dark Ages signal

2020 ◽  
Author(s):  
Philippa S Cole ◽  
Joseph Silk
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
Power Spectrum ◽  
High Redshift ◽  
Power Spectra ◽  
Mass Range ◽  
Small Scale ◽  
Primordial Black Hole ◽  
Small Scales ◽  
Single Field

Abstract Primordial black hole production in the mass range 10 − 104 M⊙ is motivated respectively by interpretations of the LIGO/Virgo observations of binary black hole mergers and by their ability to seed intermediate black holes which would account for the presence of supermassive black holes at very high redshift. Their existence would imply a boost in the primordial power spectrum if they were produced by overdensities reentering the horizon and collapsing after single-field inflation. This, together with their associated Poisson fluctuations would cause a boost in the matter power spectrum on small scales. The extra power could become potentially observable in the 21cm power spectrum on scales around k ∼ 0.1 − 50 Mpc−1 with the new generation of filled low frequency interferometers. We explicitly include the contribution from primordial fluctuations in our prediction of the 21cm signal which has been previously neglected, by constructing primordial power spectra motivated by single-field models of inflation that would produce extra power on small scales. We find that depending on the mass and abundance of primordial black holes, it is important to include this contribution from the primordial fluctuations, so as not to underestimate the 21cm signal. Evidently our predictions of detectability, which lack any modelling of foregrounds, are unrealistic, but we hope that they will motivate improved cleaning algorithms that can enable us to access this intriguing corner of PBH-motivated parameter space.

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