Plasmon Mediation of Charge Pairing in High Temperature Superconductors

A Bose-Einstein condensate (BEC) of a nonzero momentum Cooper pair constitutes a composite boson or simply a boson. We demonstrated that the quantum coherence of the two-component BEC (boson and fermion condensates) is controlled by plasmons. It has been proposed that plasmons, observed in both electron-doped and hole-doped cuprates, originates from the long-range Coulomb screening, where the transfer momentum q ⟶ 0 . We further show that the screening mediates boson-fermion pairing at condensate state. While only about 1 % of plasmon energy mediates the charge pairing, most of the plasmon energy is used to overcome the modes that compete against superconductivity such as phonons, charge density waves, antiferromagnetism, and damping effects. Additionally, the dependence of frequency of plasmons on the material of a superconductor is also explored. This study gives a quantum explanation of the modes that enhance and those that inhibit superconductivity. The study informs the nature of electromagnetic radiations (EMR) that can enhance the critical temperature of such materials.

Spectra to Structure: Deep Reinforcement Learning for Molecular Inverse Problem

Spectroscopy is the study of how matter interacts with electromagnetic radiations of specific frequencies that has led to several monumental discoveries in science. The spectra of any particular molecule is highly information-rich, yet the inverse relation from the spectra to the molecular structure is still an unsolved problem. Nuclear Magnetic Resonance (NMR) spectroscopy is one such critical tool in the tool-set for scientists to characterise any chemical sample. In this work, a novel framework is proposed that attempts to solve this inverse problem by navigating the chemical space to find the correct structure that resulted in the target spectra. The proposed framework uses a combination of online Monte- Carlo-Tree-Search (MCTS) and a set of offline trained Graph Convolution Networks to build a molecule iteratively from scratch. Our method is able to predict the correct structure of the molecule ∼80% of the time in its top 3 guesses. We believe that the proposed framework is a significant step in solving the inverse design problem of NMR spectra to molecule.

Gravitational and electromagnetic radiation from binary black holes with electric and magnetic charges: elliptical orbits on a cone

Extending the electromagnetic and gravitational radiations from binary black holes with electric and magnetic charges in circular orbits in Liu et al. (Phys. Rev. D 102:103520, 2020), we calculate the total emission rates of energy and angular momentum due to gravitational and electromagnetic radiations from dyonic binary black holes in precessing elliptical orbits. It is shown that the emission rates of energy and angular momentum due to gravitational and electromagnetic radiations have the same dependence on the conic angle for different orbits. Moreover, we obtain the evolutions of orbits and find that a circular orbit remains circular while an elliptic orbit becomes quasi-circular due to electromagnetic and gravitational radiations. Using the evolution of orbits, we derive the waveform models for dyonic binary black hole inspirals and show the amplitudes of the gravitational waves for dyonic binary black hole inspirals differ from those for Schwarzschild binary black hole inspirals, which can be used to test electric and magnetic charges of black holes.

Efectos de la radiación electromagnética: Un estudio de caso

En este trabajo se analizan los efectos biológicos de las radiaciones electromagnéticas a partir de la recopilación y comparación de fuentes bibliográficas que evidencian el estudio de dicho fenómeno físico, analizado mediante una metodología cualitativa basada en la revisión bibliográfica de trabajos que reportan aspectos fundamentales del tema en cuestión y examinados por medio de una matriz de análisis que recoge los puntos de vista más importantes de cada investigación. Dentro de los resultados obtenidos no hay coincidencia, ya que algunos autores apoyan la idea de que estas radiaciones son perjudiciales para la salud humana, mientras que otros no descartan la posibilidad de que estas puedan ser inofensivas para el ser humano, pero sin desechar el riesgo de que a largo plazo puedan generar problemas de salud. Después de realizar las evaluaciones correspondientes y utilizar los métodos ya mencionados con anterioridad, se concluye que las radiaciones electromagnéticas pueden llegar a ser perjudiciales para la salud humana a exposiciones prolongadas, por esto se advierte sobre posibles enfermedades y se dan recomendaciones al respecto. This work analyzes the biological effects of electromagnetic radiation based on the compilation and comparison of bibliographic sources that evidence the study of this physical phenomenon, analyzed by means of a qualitative methodology based on the bibliographic review of works that report fundamental aspects of the subject in question and examined by means of an analysis matrix that gathers the most important points of view of each research. Within the results obtained there is no coincidence, since some authors support the idea that these radiations are harmful to human health, while others do not rule out the possibility that they may be harmless to humans, but without discarding the risk that in the long term they may generate health problems. After performing the corresponding evaluations and using the methods mentioned above, it is concluded that electromagnetic radiations may be harmful to human health with prolonged exposure, and for this reason a warning is given about possible diseases and recommendations are given in this regard.

Exposure to radio-frequency electromagnetic radiation shortens sleep duration and lengthens sleep latency and sleep inertia in humans living in proximity to the base transceiver stations

Radio-frequency electromagnetic radiations (RF-EMRs) are ubiquitous at present. Therefore, it is essential to assess the impact of RF-EMRs on human health. In this study, we examined the non-thermal effects of RF-EMR expo-sure on behavioral sleep patterns in humans. A total of 1072 randomly se-lected individuals living in the proximity of base transceiver stations (BTS) participated in the study. The sample consisted of 122 subjects from zone A (Inter-tower region), 310 from zone B (0-150 m), 316 from zone C (150-300 m), 197 from zone D (300-500 m), and 127 from the control zone (without BTS installations). We classified the zones as a function of distance from the BTS. We measured electric-field strength at each participant’s house using Narda Broadband Field Meter-550 equipped with EF0-391 probe. We used Munich-Chronotype Questionnaire to determine each subject’s behavioral sleep patterns. ANOVA results revealed the highest E-field strength in zone-A than the other zones and control. Results from ANCOVA, Kruskal-Wallis, and Mann-Whitney U tests showed that the participants from zone A had shorter sleep duration, and longer sleep latency and inertia than those living in other zones. Further, a significant effect of co-factors ‘gender’ and ‘year of resi-dence’ was validated on mid-sleep (work and free days). Compared to wom-en and > 5-year residents, men and 1-5-year residents had delayed mid-sleep. We concluded that RF-EMR might alter the behavioral sleep patterns of subjects living in the vicinity of BTS. However, further confirmatory and extensive studies are necessary, involving a large sample living near many more BTS installations.