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Questions related from Hossein Javadi
Over the past century, much effort has been put into defining the particle. Various definitions have been proposed in this issue, including point-like, wave function collapse, quantum field...
04 December 2021 6,988 3 View
If so, what means massless photon? If no, why a moving photon has the mass equal to m=E/c^2? 'The theory of relativity deduces, from its fundamental assumption, a clear and convincing answer to...
23 May 2018 7,063 71 View
A brief overview of the cosmological models, it is well illustrated that our cosmological knowledge is the cognitive function we have acquired on the earth. Ptolemy's cosmological model was...
28 April 2018 8,712 11 View
There is still no consensus on whether the fields are composed of particles or no. For examples: Art Hobson, There are no particles, there are only fields, American Journal of Physics 81, 211...
17 February 2018 4,005 11 View
"All our theories today seem to imply that the universe should contain a tremendous concentration of energy, even in the emptiest regions of space. The gravitational effects of this so-called...
16 February 2018 6,654 38 View
In 1924 de Broglie assumed that for particles the same relations are valid as for the photon: E=hf and E=pc Where E and p are the energy and momentum of the...
18 January 2018 5,275 30 View
Quantum gravity could be probed by entangled masses http://physicsworld.com/cws/article/news/2018/jan/15/quantum-gravity-could-be-probed-by-entangled-masses I have described the relationship...
15 January 2018 7,506 8 View
The Standard Model of particle physics describes the universe in terms of Matter (fermions) and Forces (bosons). Particles of matter transfer discrete amounts of energy by exchanging bosons with...
23 December 2017 1,973 9 View
Usually, this phenomenon is explained by relativistic mass of the electron. How can we describe it by zero rest mass of the photon?
22 December 2017 9,087 53 View
Why dark energy produces a repulsive force field is a bit complicated. Quantum theory says virtual particles can pop into existence for the briefest of moments before returning to nothingness....
16 October 2017 9,941 9 View
The Standard Model describes the phenomena within its domain accurately, it is still incomplete. Perhaps it is only a part of a bigger picture of the modern physics which includes the deeper and...
13 October 2017 5,854 17 View
I saw the following text and have thought this is debatable. The gravitational redshift or blueshift shows that, in the gravitational field, the energy of light is reduced or increased. The law of...
09 December 2016 8,792 21 View
Einstein described gravity as equivalent to curves in space and time, but physicists have long searched for a theory of gravitons, its putative quantum-scale source. Physicists have searched for a...
08 November 2016 7,806 26 View
Physicist says our Universe could have spawned from a black hole According to our best understanding of the Universe, if you travel back in time as far as you can, around 13.8 billion years or so,...
21 October 2016 3,719 42 View
If spacetime is like a liquid—a concept some physicists say could help resolve a confounding disagreement between two dominant theories in physics—it must be a very special liquid indeed. A recent...
15 October 2016 8,303 22 View
Why does the same object weigh more when it is hot than when it is cold? The reason why hot objects are heavier is because E=mc^2. If you have absolutely identical objects that have the same...
10 February 2016 9,861 20 View
Quantum field theory comes from starting with a theory of fields, and applying the rules of quantum mechanics. A field is simply a mathematical object that is defined by its value at every point...
22 January 2016 7,380 39 View
Once a photon of light is born, it travels at a speed of 300,000 km/sec until it collides with a charged particle and is diverted in another...
28 December 2015 8,204 48 View
The Nobel Prize in Physics 1965 was awarded jointly to Sin-Itiro Tomonaga, Julian Schwinger and Richard P. Feynman "for their fundamental work in quantum electrodynamics, with deep-ploughing...
07 December 2015 2,848 98 View
"THE MEANING OF RELATIVITY” is a description of General Relativity by Einstein. http://www.gutenberg.org/files/36276/36276-pdf.pdf?session_id=c5241a18ca850266faa6c085d03962643b2430f6 Einstein...
16 November 2015 2,415 68 View
Symmetries are not hard to find. Plates in the china shop look the same when rotated; serving platters are identical to their mirror reflection. But much of the world is messy and asymmetric, and...
30 October 2015 7,226 17 View
"Two pieces of matter that are close to each other have less [positive] energy than the same two pieces a long way apart, because you have to expend energy to separate them against the...
25 October 2015 8,967 34 View
The Nobel Prize in Physics 2015 recognises Takaaki Kajita in Japan and Arthur B. McDonald in Canada, for their key contributions to the experiments which demonstrated that neutrinos change...
12 October 2015 3,217 36 View
For a physicist, the vacuum is the lowest-energy state, after taking these quantum e ects into account. This lowest-energy state may not possess all the symmetries of the underlying equations of...
12 September 2015 3,519 34 View
Is the Universe homogeneous?http://arxiv.org/abs/1104.1300New evidence for a preferred direction in spacetime challenges the cosmological...
27 July 2014 3,294 16 View
This may probably seem an unusual question in physics however, taking it into consideration may lead us to solve some of the problems in this science. As every physicist knows, in QM and...
16 April 2014 159 9 View
I am trying to explain something that I have posted to group before, but seem they need explanations more. At first we need to leave our ideas of point particles and zero rest mass particles. In...
31 March 2014 1,525 3 View
The Einstein field equation or Einstein equation is a dynamical equation that describes how matter and energy change the geometry of space-time, this curved geometry being interpreted as the...
27 March 2014 10,048 11 View
WE ARE born. We die. We call the span that separates these events time. Its passage is perhaps the most fundamental feature of our human experience, yet we are incapable of saying exactly what it...
01 January 1970 6,736 98 View
At the beginning of the 20th century, Newton’s second law was corrected considering the limit speed c and the relativistic mass. At that time there has not been a clear understanding of the...
01 January 1970 2,263 21 View
“Those photons are said to be virtual because the ground state cannot radiate. Their presence can be however directly revealed when the system parameters are non-adiabatically modulated in time,...
01 January 1970 3,596 6 View
https://www.quora.com/What-are-the-basic-elements-that-must-be-available-in-the-theory-of-everything/answer/Hossein-Javadi-1?share=7f7b7870&srid=F7rA What is a theory of everything? “A Theory...
01 January 1970 7,295 6 View
01 January 1970 849 27 View
Scattering of light by matter has been studied extensively in the past. Yet, the most fundamental process, the scattering of a single photon by a single atom, is largely unexplored. One prominent...
01 January 1970 6,663 15 View
https://www.researchgate.net/post/In_the_cosmological_equation_what_is_the_relationship_between_vacuum_energy_and_cosmological_constant
01 January 1970 3,566 37 View
01 January 1970 5,862 3 View
01 January 1970 8,003 3 View
