In sfarsit a fost creeata masa NEGATIVA!

Washington State University a scris:‘Negative mass’ created at Washington State University

APRIL 10, 2017


Michael Forbes WSU physics By Eric Sorensen, WSU science writer

PULLMAN, Wash. – Washington State University physicists have created a fluid with negative mass, which is exactly what it sounds like. Push it, and unlike every physical object in the world we know, it doesn’t accelerate in the direction it was pushed. It accelerates backwards.
The phenomenon is rarely created in laboratory conditions and can be used to explore some of the more challenging concepts of the cosmos, said Michael Forbes, a WSU assistant professor of physics and astronomy and an affiliate assistant professor at the University of Washington. The research appears today in the journal Physical Review Letters, where it is featured as an “Editor’s Suggestion.”
Hypothetically, matter can have negative mass in the same sense that an electric charge can be either negative or positive. People rarely think in these terms, and our everyday world sees only the positive aspects of Isaac Newton’s Second Law of Motion, in which a force is equal to the mass of an object times its acceleration, or F=ma.
In other words, if you push an object, it will accelerate in the direction you’re pushing it. Mass will accelerate in the direction of the force.
“That’s what most things that we’re used to do,” said Forbes, hinting at the bizarreness to come. “With negative mass, if you push something, it accelerates toward you.”

Conditions for negative mass
He and his colleagues created the conditions for negative mass by cooling rubidium atoms to just a hair above absolute zero, creating what is known as a Bose-Einstein condensate. In this state, predicted by Satyendra Nath Bose and Albert Einstein, particles move extremely slowly and, following the principles of quantum mechanics, behave like waves. They also synchronize and move in unison as what is known as a superfluid, which flows without losing energy.
Led by Peter Engels, WSU professor of physics and astronomy, researchers on the sixth floor of Webster Hall created these conditions by using lasers to slow the particles, making them colder, and allowing hot, high energy particles to escape like steam, cooling the material further.
The lasers trapped the atoms as if they were in a bowl measuring less than a hundred microns across. At this point, the rubidium superfluid has regular mass. Breaking the bowl will allow the rubidium to rush out, expanding as the rubidium in the center pushes outward.
To create negative mass, the researchers applied a second set of lasers that kicked the atoms back and forth and changed the way they spin. Now when the rubidium rushes out fast enough, if behaves as if it has negative mass.
“Once you push, it accelerates backwards,” said Forbes, who acted as a theorist analyzing the system. “It looks like the rubidium hits an invisible wall.”
Avoiding underlying defects
The technique used by the WSU researchers avoids some of the underlying defects encountered in previous attempts to understand negative mass.
“What’s a first here is the exquisite control we have over the nature of this negative mass, without any other complications” said Forbes.  Their research clarifies, in terms of negative mass, similar behavior seen in other systems.
This heightened control gives researchers a new tool to engineer experiments to study analogous physics in astrophysics, like neutron stars, and cosmological phenomena like black holes and dark energy, where experiments are impossible.
“It provides another environment to study a fundamental phenomenon that is very peculiar,” Forbes said.
Forbes’ colleagues on the Physical Review Letters paper include WSU research assistants Mohammad Khamehchi, Khalid Hossain and Maren Mossman, as well as Thomas Busch in Japan and Yongping Zhang in China and Japan. The work was supported in part by a WSU New Faculty Seed Grant and the National Science Foundation.

News media contact:
Michael Forbes, WSU assistant professor of physics and astronomy, (206) 280-9082, m.forbes@wsu.edu

Abstract:
A negative effective mass can be realized in quantum systems by engineering the dispersion relation. A powerful method is provided by spin-orbit coupling, which is currently at the center of intense research efforts. Here we measure an expanding spin-orbit coupled Bose-Einstein condensate whose dispersion features a region of negative effective mass. We observe a range of dynamical phenomena, including the breaking of parity and of Galilean covariance, dynamical instabilities, and self-trapping. The experimental findings are reproduced by a single-band Gross-Pitaevskii simulation, demonstrating that the emerging features—shock waves, soliton trains, self-trapping, etc.—originate from a modified dispersion. Our work also sheds new light on related phenomena in optical lattices, where the underlying periodic structure often complicates their interpretation.

negativ a scris:

Nu au obtinut masa negativa, ci au reusit sa redirectioneze impulsul prin rotatia particulelor din condensatul Bose Einstein. Au obtinut un fel de compensator inertial, (am mai explicat chestia asta aici) dar asta nu înseamna masa negativa (eu stiu mai bine cum e cu negativitatea asta    ) Orice socoteala am facut, nu mi-a dat masa negativa sau zero. Masa e un element fundamental, cum e spatiul si timpul. Nu pot fi negative, fiind infinite, deci invariante.
"... negative mass, which is exactly what it sounds like." Reporterii lu' peste înteleg si mai putin decât nedumeritii cercetatori.

virgil a scris:1.Daca creasta unui val izbeste malul, se spune conventional ca avem masa pozitiva, sensul impulsului fiind indreptat inspre mal.
2. Daca un gol al valului se apropie de mal, se poate spune ca avem masa negativa, sensul impulsului fiind indreptat spre apa.
. . . . .

virgil_48 a scris:

virgil a scris:1.Daca creasta unui val izbeste malul, se spune conventional ca avem masa pozitiva, sensul impulsului fiind indreptat inspre mal.
2. Daca un gol al valului se apropie de mal, se poate spune ca avem masa negativa, sensul impulsului fiind indreptat spre apa.
. . . . .

In loc sa respingi aberatiile, ti le insusesti si cauti sa le justifici.
A devenit o moda. Ce scrii in citat nu are legatura cu masa.
Daca dintr-un corp cu masa X tai o bucata cu masa Y, si ramane
numai masa Z, nu inseamna ca Y este o masa negativa. Numai
in operatia algebrica apare cu minus.

virgil a scris:taie tu din electronul X o bucata Y si vezi ce ramane.

negativ a scris:

virgil a scris:taie tu din electronul X o bucata Y si vezi ce ramane.

În principiu ar trebui sa ramâna doua fragmente legate prin "spooky action at distance". Nu stiu daca merge si pentru electron.

virgil a scris:. . . . .
taie tu din electronul X o bucata Y si vezi ce ramane.
Masa este o vibratie a unui mediu scos din starea de echilibru neutru, prin vibratie, dar nu la orice frecventa se incheaga o particula, ci numai la frecventa de rezonanta a unei stari posibile. Din moment ce avem o oscilatie electromagnetica este normal sa avem stari pozitive sau negative, precum pulsatiile unui curent alternativ redresat. Separand alernantele pozitive obtinem o entitate pozitiva, iar din alternantele negative obtinem o entitate negativa. Cele doua entitati sunt compementare. Asa se justifica atat masa cat si sarcina de un anumit semn.

virgil_48 a scris:

virgil a scris:. . . . .
taie tu din electronul X o bucata Y si vezi ce ramane.
Masa este o vibratie a unui mediu scos din starea de echilibru neutru, prin vibratie, dar nu la orice frecventa se incheaga o particula, ci numai la frecventa de rezonanta a unei stari posibile. Din moment ce avem o oscilatie electromagnetica este normal sa avem stari pozitive sau negative, precum pulsatiile unui curent alternativ redresat. Separand alernantele pozitive obtinem o entitate pozitiva, iar din alternantele negative obtinem o entitate negativa. Cele doua entitati sunt compementare. Asa se justifica atat masa cat si sarcina de un anumit semn.

Daca tu crezi ca masa este o vibratie si nu materie, alcatuita din
particule, inseamna ca îndoctrinarea si inselatoria isi fac datoria.

virgil a scris:
Orice vibratie, presupune ca exista si "ceva" care vibreaza fata de ce este in jurul ei. Acel "ceva" inseamna materia primordiala aflata intr-o stare de neutralitate, precum puricii pe ecranul TV, lipsit de semnal. Cel mai simplu semnal este fotonul sau cuanta de energie, care reprezinta prima forma de manifestare ordonata a substantei, care in anumite situatii poate genera o particula, adica o forma stabila de energie capabila sa se organizeze in alte forme vibratorii. Particula este caracterizata de anumite proprietati, precum sarcina in spatiul electromagnetic, si masa in spatiul gravitational. 
Ai gasit aceste idei in cartea de fizica, de consideri ca sunt indoctrinat?

un logician a scris:..... este numai o chemare la logica, realism si gandire personala.

virgil_48 a scris:Ai observat ca nu prea am tangente cu cartea de fizica de ma
intrebi unde am gasit anumite idei. Nu trebuie sa te ingrijorezi,
ce scriu eu aici, este numai o chemare la logica, realism si
gandire personala.

WoodyCAD a scris:. . . . .

Atunci cand va putea sa aplice/explice "NEGATIV/POZITIV" planetei TERRA, LUNII, SOARELUI..etc...maimutica va pricepe!
(Un nou sistem unitar-conceptual de gandire)