bose condensation
Recently Published Documents


TOTAL DOCUMENTS

293
(FIVE YEARS 20)

H-INDEX

39
(FIVE YEARS 1)

2021 ◽  
Author(s):  
Wen-Xiang Chen

This article points out that when the boundary condition $\frac{T}{T_{c}}=z$ (when z is a complex number) is preset, bosons can produce Bose condensation without an energy layer. Under Bose condensation, incident waves may condense in various black holes in the theory of loop quantum gravity. This paper shows that under the gravitational subsystem composed of two bosons, the extreme value of the measurement uncertainty principle can be smaller because the probability flow density is related to the time parameter. This is a model to verify the existence of gravitons.


Author(s):  
A. V. H. McPhail ◽  
M. D. Hoogerland

Bose–Einstein condensates of weakly interacting, ultra-cold atoms have become a workhorse for exploring quantum effects on atomic motion, but does this condensate need to be in the ground state of the system? Researchers often perform transformations so that their Hamiltonians are easier to analyse. However, changing Hamiltonians can require an energy shift. We show that transforming into a rotating or oscillating frame of reference of a Bose condensate does not then satisfy Einstein’s requirement that a condensate exists in the zero kinetic energy state. We show that Bose condensation can occur above the ground state and at room temperature, referring to recent literature.


2021 ◽  
Author(s):  
A. D. Belanovsky ◽  
P. M. Vetoshko ◽  
Yu. M. Bunkov

Abstract The explosive development of quantum magnonics is explained by its potential of use in quantum computers, processing information and the formation of hybrid quantum systems. The processes of spatial correlation of quantum systems are fundamental and lead to such phenomena as the Josephson effect and superconductivity. In particular, they determine the phenomenon of the magnon superfluidity and magnon Bose condensation which were first discovered in antiferromagnetic superfluid 3He. In this article, we consider the features of magnon Bose condensation in yttrium iron garnet film. We simulate the processes of magnon BEC coherency and magnon tunneling through the gap.


2021 ◽  
Author(s):  
Wen-Xiang Chen

This article points out that when the boundary conditions$\frac{T}{T_{c}}=z$ (when z is plural) are preset, bosons can produce Bose condensation without an energy layer. Under Bose condensation, the incident wave may condense in the Schwarzschild black hole. At that time, the Schwarzschild black hole event horizon Potential barriers can be generated nearby, and we think that Schwarzschild black holes can also generate superradiation phenomena(This article uses the natural unit system).This implies that the cosmic censorship conjecture may be violated.


2021 ◽  
Author(s):  
Wen-Xiang Chen

This article points out that when the boundary condition $\frac{T}{T_{c}}=z$ (when z is a complex number) is preset, bosons can produce Bose condensation without an energy layer. Under Bose condensation, incident waves may condense in various black holes in the theory of loop quantum gravity. At that time, potential barriers will be generated near the horizon of various black holes, and we believe that these black holes will also produce super-radiation phenomena (this article uses the natural unit system). We assume that the simple loop quantum gravity theoretical model that can produce superradiation phenomena that does not exist in the traditional theory provides experimental evidence for loop quantum gravity.


2021 ◽  
Vol 52 (2) ◽  
pp. 202-238
Author(s):  
V. A. Zagrebnov
Keyword(s):  

2021 ◽  
Vol 126 (6) ◽  
Author(s):  
Michael O. Flynn ◽  
Thomas E. Baker ◽  
Siddharth Jindal ◽  
Rajiv R. P. Singh
Keyword(s):  

Author(s):  
James P. Sethna

Quantum statistical mechanics governs metals, semiconductors, and neutron stars. Statistical mechanics spawned Planck’s invention of the quantum, and explains Bose condensation, superfluids, and superconductors. This chapter briefly describes these systems using mixed states, or more formally density matrices, and introducing the properties of bosons and fermions. We discuss in unusual detail how useful descriptions of metals and superfluids can be derived by ignoring the seemingly important interactions between their constituent electrons and atoms. Exercises explore how gregarious bosons lead to superfluids and lasers, how unsociable fermions explain transitions between white dwarfs, neutron stars, and black holes, how one calculates materials properties in semiconductors, insulators, and metals, and how statistical mechanics can explain the collapse of the quantum wavefunction during measurement.


2020 ◽  
Vol 229 (22-23) ◽  
pp. 3517-3536
Author(s):  
D. Blaschke ◽  
A. V. Friesen ◽  
Yu. L. Kalinovsky ◽  
A. Radzhabov

AbstractWithin the three-flavor PNJL and EPNJL chiral quark models we have obtained pseudoscalar meson properties in quark matter at finite temperature T and baryochemical potential μB. We compare the meson pole (Breit-Wigner) approximation with the Beth-Uhlenbeck (BU) approach that takes into account the continuum of quark-antiquark scattering states when determining the partial densities of pions and kaons. We evaluate the kaon-to-pion ratios along the (pseudo-)critical line in the T − μB plane as a proxy for the chemical freezeout line, whereby the variable x = T∕μB is introduced that corresponds to the conserved entropy per baryon as initial condition for the heavy-ion collision experiments. We present a comparison with the experimental pattern of kaon-to-pion ratios within the BU approach and using x-dependent pion and strange quark potentials. A sharp “horn” effect in the energy dependence K+∕π+ ratio is explained by the enhanced pion production at energies above √sNN=8 GeV, when the system enters the regime of meson dominance. This effect is in line with the enhancement of low-momentum pion spectra that is discussed as a precursor of the pion Bose condensation and entails the occurrence of a nonequilibrium pion chemical potential of the order of the pion mass. We elucidate that the horn effect is not related to the existence of a critical endpoint in the QCD phase diagram.


Sign in / Sign up

Export Citation Format

Share Document