Analysis of big bounce in Einstein–Cartan cosmology

Cubero, Jordan L.; Popławski, Nikodem J.

doi:10.1088/1361-6382/ab5cb9

Cited by 16 publications

(13 citation statements)

References 59 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…dilaton) exist but they have not received much support and seem to be contradicted by the Higgs mechanism [301]. 71 Einstein Cartan theory [295,294,297] and Teleparallelism [271,270] which trades curvature for torsion (no curvature exist; yet Teleparallelism is equivalent to GR) can avoid singularities and support big bounce solutions [288,289,291,296,297,271,270,292]. sion in our model also implies no singularities 72 and possible support for big bounces.…”

Section: Gravity Out Of Entanglementmentioning

confidence: 84%

“…We showed in section 4.8 that it provides a new effective Ricci curvature scalar and tensor and that the Hilbert-Einstein action reflects actually that scalar. Another consequence of the reasoning and construction of the action is that Hilbert-Einstein action is the correct action and not a first order approximation in R as sometimes proposed [23,300,298,299,25,308,295,294,297](and many more proposals exist and keep on coming). Earlier, we also showed a possible additional microscopic torsion (that may or may not exist).…”

Section: Gravity Emergence From Entanglement and No Supra Luminositymentioning

confidence: 99%

See 1 more Smart Citation

Quantum Gravity Emergence from Entanglement in a Multi-Fold Universe

Maes¹

2020

Preprint

217

View full text Add to dashboard Cite

We start from a hypothetical multi-fold universe U_{MF}}, where the propagation of everything is slower or equal to the speed of light and where entanglement extends the set of paths available to Path Integrals. This multi-fold mechanism enables EPR (Einstein-Podolsky-Rosen) “spooky actions at distance” to result from local interactions in the resulting folds. It produces gravity-like attractive effective potentials in the spacetime, between entangled entities, that are caused by the curvature of the folds. When quantized, multi-folds correspond to gravitons and they are enablers of EPR entanglement. Gravity emerges non-perturbative and covariant from EPR entanglement between virtual particles surrounding an entity.In U_{MF}, we encounter mechanisms that predict gravity fluctuations when entanglement is present, including in macroscopic entanglements. Besides providing a new perspective on quantum gravity, when added to the Standard Model and Standard Cosmology, U_{MF} can contribute explanations of several open questions and challenges. It also clarifies some relationships and challenges met by other quantum gravity models and Theories of Everything. It leads to suggestions for these works.We also reconstruct the spacetime of U_{MF}, starting from the random walks of particles in an early spacetime. U_{MF} now appears as a noncommutative, discrete, yet Lorentz symmetric, spacetime that behaves roughly 2-Dimensional at Planck scales, when it is a graph of microscopic Planck size black holes on a random walk fractal structure left by particles that can also appear as also microscopic black holes. Of course, at larger scales, spacetime appears 4-D, where we are able to explain curvature and recover Einstein’s General Relativity. We also discover an entanglement gravity-like contributions and massive gravity at very small scales. This is remarkable considering that no Hilbert Einstein action, or variations expressing area invariance, were introduced. Our model also explains why semi classical approaches can work till way smaller scale than usually expected and present a new view on an Ultimate Unification of all forces, at very small scales.We also explore opportunities for falsifiability and validation of our model, as well as ideas for futuristic applications that may be worth considering, if U_{MF} was a suitable model for our universe U_{real}.

show abstract

Section: Gravity Out Of Entanglementmentioning

confidence: 84%

Section: Gravity Emergence From Entanglement and No Supra Luminositymentioning

confidence: 99%

Quantum Gravity Emergence from Entanglement in a Multi-Fold Universe

Maes¹

2020

Preprint

217

View full text Add to dashboard Cite

show abstract

“…EC agrees with solar system, binary pulsar, and cosmological tests of general relativity because even at nuclear densities, the corrections from torsion to the Einstein equations are negligible [48][49][50][51][52][53][54][55]57]. The spin-torsion coupling in EC generates gravitational repulsion at extremely high densities and thus avoids the formation of singularities in black holes and at the big bang [67][68][69][70][71][72][73][74][75][76]. The collapsing matter in a black hole bounces at a finite density and then expands into a new, finite region of space with positive curvature on the other side of the event horizon, which may be regarded as a new universe [77][78][79][80][81][82][83][84][85].…”

Section: Torsion and Commutation Relation For Momentummentioning

confidence: 81%

Noncommutative Momentum and Torsional Regularization

Popławski

2020

Found Phys

Self Cite

View full text Add to dashboard Cite

We show that in the presence of the torsion tensor S k ij , the quantum commutation relation for the four-momentum, traced over spinor indices, is given byIn the Einstein-Cartan theory of gravity, in which torsion is coupled to spin of fermions, this relation in a coordinate frame reduces to a commutation relation of noncommutative momentum space, [p i , p j ] = i ijk Up 3 p k , where U is a constant on the order of the squared inverse of the Planck mass. We propose that this relation replaces the integration in the momentum space in Feynman diagrams with the summation over the discrete momentum eigenvalues. We derive a prescription for this summation that agrees with convergent integrals:

show abstract

“…Torsion allows for additional degrees of freedom, and so in the past, models with torsion were proposed to solve certain early Universe problems, replacing the initial singularity with a big bounce and inflation [3][4][5]. Recently, cosmological models with torsion were used to investigate alternatives to dark energy [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Cosmological signatures of torsion and how to distinguish torsion from the dark sector

Bolejko¹,

Cinus²,

Roukema³

2020

Phys. Rev. D

View full text Add to dashboard Cite

Torsion is a non-Riemannian geometrical extension of general relativity that allows including the spin of matter and the twisting of spacetime. Cosmological models with torsion have been considered in the literature to solve problems of either the very early (high redshift z) or the present-day Universe. This paper focuses on distinguishable observational signatures of torsion that could not be otherwise explained with a scalar field in pseudo-Riemannian geometry. We show that when torsion is present, the cosmic duality relation between the angular diameter distance, D A , and the luminosity distance, D L , is broken. We show how the deviation described by the parameter η ¼ D L =½D A ð1 þ zÞ 2 − 1 is linked to torsion and how different forms of torsion lead to special-case parametrizations of η, including η 0 z, η 0 z=ð1 þ zÞ, and η 0 lnð1 þ zÞ. We also show that the effects of torsion could be visible in low-redshift data, inducing biases in supernovae-based H 0 measurements. We also show that torsion can impact the Clarkson-Bassett-Lu (CBL) functionwhere D is the transverse comoving distance. If D is inferred from the luminosity distance, then, in general, nonzero torsion models, CðzÞ ≠ 0. For pseudo-Riemannian geometry, the Friedmann-Lemaître-Robertson-Walker metric has CðzÞ ≡ 0; thus, the measurement of the Clarkson-Bassett-Lu function could provide another diagnostic of torsion.

show abstract

Analysis of big bounce in Einstein–Cartan cosmology

Cited by 16 publications

References 59 publications

Quantum Gravity Emergence from Entanglement in a Multi-Fold Universe

Quantum Gravity Emergence from Entanglement in a Multi-Fold Universe

Noncommutative Momentum and Torsional Regularization

Cosmological signatures of torsion and how to distinguish torsion from the dark sector

Contact Info

Product

Resources

About