Pellegrini not happy with Felipe Andersons form

first_imgWest Ham manager Manuel Pellegrini has backed club-record signing Felipe Anderson despite his lack of form and believes the Brazilian can still turn it around.West Ham fans are unhappy with Anderson’s work-rate, but Pellegrini believes the midfielder will find his form in the Premier League.Anderson signed for West Ham from Lazio in a transfer deal reported to worth up to £42m but has only managed one goal and one assist from 10 Premier League starts.Pellegrini told Sky Sports: “Happy with his [Anderson’s] performance? In a global way, I think I am not happy, I think Felipe is not happy. I think that everyone is not happy because he has demonstrated that he can do more.Report: Rice is committed to West Ham not a United moveReport: Rice is committed to West Ham not a United move George Patchias – September 4, 2019 Declan Rice is committed to his West Ham contract and not a move to Manchester United.In an interview reported by football.london, Rice opens up…“He had good moments in part of the game [in the league against Spurs], he also had bad moments, but he is not the first player that needs some time to know what is the Premier League.“But what I don’t have any doubt about with Felipe is his performance or his commitment with the team. He knows his performances must improve and he is giving his best to do it.“I trust a lot in him and he is always a player that can make easy mistakes but can also give you different things.”last_img read more

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Research team claims to have directly sampled electricfield vacuum fluctuations

first_img © 2015 Phys.org Scientists ‘squeeze’ light one particle at a time Theoretical physicists believe that empty space is not empty at all, instead it is filled with quantum particles that pop in and out of existence creating what are known as electric-field vacuum fluctuations. Prior research has led to efforts that have measured such fluctuations indirectly, but no one, until now, has claimed to be able to measure them directly.The experiment conducted by the team in Germany involved using a long pulse of light to study a shorter pulse of light by firing both through a crystal at the same time. The long pulse had a horizontal polarization while the shorter pulse had a vertical polarization. In such an arrangement, properties of the crystal are dependent on the electric field that exists inside of it, which in turn causes a change in the polarization of the beams that are fired into it and then emerge on the other side. The researchers adjusted the timing of the light pulses to map out fluctuations in the electric field. To offset vacuum fluctuations related to their own existence, they put in just the probe pulse—nothing else. When repeated many times, the researchers found the polarization varied slightly, which the researchers attributed to vacuum fluctuations. To be able to actually see what was going on, the team varied the width and duration of the pulses but not the number of photons in a given beam. They noted that the shot noise should have stayed constant as the pulse grew in size, but it did not, which the team claims was due to electric-field vacuum fluctuations.Not everyone is convinced—many in the field on reading the paper by the team were quick to point out that variations in the pulse could just as easily have come from something else. Clearly more work will have to be done before the claims made by the team are accepted by the physics community. Journal information: Science Citation: Research team claims to have directly sampled electric-field vacuum fluctuations (2015, October 2) retrieved 18 August 2019 from https://phys.org/news/2015-10-team-sampled-electric-field-vacuum-fluctuations.html Explore furthercenter_img Vacuum fluctuations may be thought of as a flickering of the quantum light field even in total darkness. The positive (red) and negative (blue) regions are randomly distributed in space and they change constantly at high speed – similar to black-and-white noise on a TV screen with no signal input. This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only. More information: “Direct Sampling of Electric-Field Vacuum Fluctuations.” Science. DOI: 10.1126/science.aac9788ABSTRACTThe ground state of quantum systems is characterized by zero-point motion. Those vacuum fluctuations are generally deemed an elusive phenomenon that manifests itself only indirectly. Here, we report direct detection of the vacuum fluctuations of electromagnetic radiation in free space. The ground-state electric field variance is found to be inversely proportional to the four-dimensional space-time volume sampled electro-optically with tightly focused few-femtosecond laser pulses. Sub-cycle temporal readout and nonlinear coupling far from resonance provide signals from purely virtual photons without amplification. Our findings enable an extreme time-domain approach to quantum physics with nondestructive access to the quantum state of light. Operating at multi-terahertz frequencies, such techniques might also allow time-resolved studies of intrinsic fluctuations of elementary excitations in condensed matter.Press release (Phys.org)—A team of researchers working at the University of Konstanz, in Germany is claiming to have directly sampled electric-field vacuum fluctuations, which would be the first ever made. In their paper published in the journal Science, the team describes an experiment they carried out and a part of it which they claim indicates that they have measured vacuum fluctuations directly for the first time.last_img read more

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