arXiv: General Physics最新文献_第3页

Traversable wormholes with logarithmic shape function in f(R,T) gravity 在f(R,T)重力下具有对数形状函数的可穿越虫洞

arXiv: General Physics Pub Date : 2020-04-26 DOI: 10.1142/S021988782150064X

A. Dixit, Chanchal Chawla, A. Pradhan

引用次数: 4

Cosmological constant, matter, cosmic inflation and coincidence 宇宙常数，物质，宇宙膨胀和巧合

arXiv: General Physics Pub Date : 2020-04-14 DOI: 10.1142/S0217732320501230

S. Xue

引用次数: 8

Angular momentum balance and vortex production in wall-bounded flows 有壁流动中的角动量平衡与涡的产生

arXiv: General Physics Pub Date : 2020-04-10 DOI: 10.1063/1.5141513

A. Paglietti

引用次数: 0

Arithmetic Loophole in Bell's Theorem: Overlooked Threat to Entangled-State Quantum Cryptography 贝尔定理中的算术漏洞:对纠缠态量子密码学被忽视的威胁

arXiv: General Physics Pub Date : 2020-04-06 DOI: 10.12693/APHYSPOLA.139.70

M. Czachor

{"title":"Arithmetic Loophole in Bell's Theorem: Overlooked Threat to Entangled-State Quantum Cryptography","authors":"M. Czachor","doi":"10.12693/APHYSPOLA.139.70","DOIUrl":"https://doi.org/10.12693/APHYSPOLA.139.70","url":null,"abstract":"Bell's theorem is supposed to exclude all local hidden-variable models of quantum correlations. However, an explicit counterexample shows that a new class of local realistic models, based on generalized arithmetic and calculus, can exactly reconstruct rotationally symmetric quantum probabilities typical of two-electron singlet states. Observable probabilities are consistent with the usual arithmetic employed by macroscopic observers, but counterfactual aspects of Bell's theorem are sensitive to the choice of hidden-variable arithmetic and calculus. The model is classical in the sense of Einstein, Podolsky, Rosen, and Bell: elements of reality exist and probabilities are modeled by integrals of hidden-variable probaility densities. Probability densities have a Clauser-Horne product form typical of local realistic theories. However, neither the product nor the integral nor the representation of rotations are the usual ones. The integral has all the standard properties but only with respect to the arithmetic that defines the product. Certain formal transformations of integral expressions one finds in the usual proofs a la Bell do not work, so standard Bell-type inequalities cannot be proved. The system we consider is deterministic, local-realistic, rotationally invariant, observers have free will, detectors are perfect, so is free of all the canonical loopholes discussed in the literature.","PeriodicalId":369778,"journal":{"name":"arXiv: General Physics","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129703493","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 11

Normalization of the Ground State of the Supersymmetric Harmonic Oscillator 超对称谐振子基态的归一化

arXiv: General Physics Pub Date : 2020-03-31 DOI: 10.31526/lhep.2020.160

Ahmed Abi Ayad

引用次数: 0

Megascopic Quantum Phenomena 宏观量子现象

arXiv: General Physics Pub Date : 2020-03-24 DOI: 10.1007/978-3-030-34941-7_14

Michal Svrvcek

引用次数: 0

Stability, dark energy parameterization and swampland aspect of Bianchi type-V Ih cosmological models with f(R,T)-gravity 具有f(R,T)-引力的Bianchi - v - Ih宇宙学模型的稳定性、暗能量参数化和沼泽特征

arXiv: General Physics Pub Date : 2020-03-23 DOI: 10.1142/S0219887820502138

A. Dixit, A. Pradhan

{"title":"Stability, dark energy parameterization and swampland aspect of Bianchi type-V Ih cosmological models with f(R,T)-gravity","authors":"A. Dixit, A. Pradhan","doi":"10.1142/S0219887820502138","DOIUrl":"https://doi.org/10.1142/S0219887820502138","url":null,"abstract":"Stability, dark energy (DE) parameterization and swampland aspects for the Bianchi form-$VI_{h}$ universe have been formulated in an extended gravity hypothesis. Here we have assumed a minimally coupled geometry field with a rescaled function of $f(R, T)$ replaced in the geometric action by the Ricci scalar $R$. Exact solutions are sought under certain basic conditions for the related field equations. For the following theoretically valid premises, the field equations in this scalar-tensor theory have been solved. It is observed under appropriate conditions that our model shows a decelerating to accelerating phase transition property. Results are observed to be coherent with recent observations. Here, our models predict that the universe's rate of expansion will increase with the passage of time. The physical and geometric aspects of the models are discussed in detail. In this model, we also analyze the parameterizations of dark energy by fitting the EoS parameter $omega(z)$ with redshift. The results obtained would be useful in clarifying the relationship between dark energy parameters. In this, we also explore the correspondence of swampland dark energy. The swampland criteria have also been shown the nature of the scalar field and the potential of the scalar field.","PeriodicalId":369778,"journal":{"name":"arXiv: General Physics","volume":"118 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123331020","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

The size of our causal Universe 因果宇宙的大小

arXiv: General Physics Pub Date : 2020-03-23 DOI: 10.1093/mnras/staa1000

E. Gaztañaga

{"title":"The size of our causal Universe","authors":"E. Gaztañaga","doi":"10.1093/mnras/staa1000","DOIUrl":"https://doi.org/10.1093/mnras/staa1000","url":null,"abstract":"A Universe with finite age also has a finite causal scale. Larger scales can not affect our local measurements or modeling, but far away locations could have different cosmological parameters. The size of our causal Universe depends on the details of inflation and is usually assumed to be larger than our observable Universe today. To account for causality, we propose a new boundary condition, that can be fulfill by fixing the cosmological constant (a free geometric parameter of gravity). This forces a cancellation of vacuum energy with the cosmological constant. As a consequence, the measured cosmic acceleration can not be explained by a simple cosmological constant or constant vacuum energy. We need some additional odd properties such as the existence of evolving dark energy (DE) with energy-density fine tuned to be twice that of dark matter today. We show here that we can instead explain cosmic acceleration without DE (or modified gravity) assuming that the causal scale is smaller than the observable Universe today. Such scale corresponds to half the sky at z=1 and 60 degrees at z=1100, which is consistent with the anomalous lack of correlations observed in the CMB. Late time cosmic acceleration could then be interpreted as the smoking gun of primordial Inflation.","PeriodicalId":369778,"journal":{"name":"arXiv: General Physics","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114194586","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 17

Modified holographic energy density-driven inflation and some cosmological outcomes 修正全息能量密度驱动的暴胀和一些宇宙学结果

arXiv: General Physics Pub Date : 2020-03-20 DOI: 10.1142/S0219887820500668

Gargee Chakraborty, S. Chattopadhyay

{"title":"Modified holographic energy density-driven inflation and some cosmological outcomes","authors":"Gargee Chakraborty, S. Chattopadhyay","doi":"10.1142/S0219887820500668","DOIUrl":"https://doi.org/10.1142/S0219887820500668","url":null,"abstract":"Motivated by the work of Nojiri et al. (2019) [S. Nojiri, S. D. Odintsov and E. N. Saridakis, Holographic inflation, Phys. Lett. B 797 (2019) 134829], the present study reports a model of inflation under the consideration that the inflationary regime is originated by a type of holographic energy density. The infrared cutoff has been selected based on the modified holographic model that is a particular case of Nojiri-Odintsov holographic dark energy cite{odi1} that unifies phantom inflation with the acceleration of the universe on late-time. On getting an analytical solution for Hubble parameter we considered the presence of bulk viscosity and the effective equation of state parameter appeared to be consistent with the inflationary scenario with some constraints. It has also been observed that in the inflationary scenario the contribution of bulk viscosity is not of much significance and its influence is increasing with the evolution of the universe. Inflationary observables have been computed for the model and the slow-roll parameters have been computed. Finally, it has been observed that the trajectories in $n_s - r$ are compatible with the observational bound found by Planck. It has been concluded that the tensor to scalar ratio for this model can explain the primordial fluctuation in the early universe as well.","PeriodicalId":369778,"journal":{"name":"arXiv: General Physics","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121517938","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 11

A magnetic-monopole-based mechanism to the formation of the Hot Big Bang modeled Universe 热大爆炸模型宇宙形成的磁单极子机制

arXiv: General Physics Pub Date : 2020-03-07 DOI: 10.1142/S0217732320500303

Q. Peng, jing-jing liu, C. Chou

引用次数: 0