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  1. #1
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    Discussion: Time Travel Impossible, Say Scientists

    Hong Kong physicists say they have proved that a single photon obeys Einstein's theory that nothing can travel faster than the speed of light -- demonstrating that outside science fiction, time travel is impossible.

    The Hong Kong University of Science and Technology research team led by Du Shengwang said they had proved that a single photon, or unit of light, "obeys the traffic law of the universe."

    "Einstein claimed that the speed of light was the traffic law of the universe or in simple language, nothing can travel faster than light," the university said on its website.

    NEWS: Warp Drive Engine Would Travel Faster Than Light

    "Professor Du's study demonstrates that a single photon, the fundamental quanta of light, also obeys the traffic law of the universe just like classical EM (electromagnetic) waves."

    The possibility of time travel was raised 10 years ago when scientists discovered superluminal -- or faster-than-light -- propagation of optical pulses in some specific medium, the team said.

    It was later found to be a visual effect, but researchers thought it might still be possible for a single photon to exceed light speed.

    Du, however, believed Einstein was right and determined to end the debate by measuring the ultimate speed of a single photon, which had not been done before.

    PHOTOS: Top 5 Time Travel Methods From the Movies

    "The study, which showed that single photons also obey the speed limit c, confirms Einstein's causality; that is, an effect cannot occur before its cause," the university said.

    "By showing that single photons cannot travel faster than the speed of light, our results bring a closure to the debate on the true speed of information carried by a single photon," said Du, assistant professor of physics.

    "Our findings will also likely have potential applications by giving scientists a better picture on the transmission of quantum information."

    Hacking Is a Matter of Time Knowledge and Patience

  2. #2
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    I am looking forward for sound discussions on the following. Let me put my point below.

    I would start by calling those scientist a bunch of poop bags .

    1)You might not be able to travel to the past , why coz if that was possible people form 2600 would have already reached 2012 that never happen this long, but you could for sure travel to the future. May be say from 2600 to 2700 , the possibility of future always remains . That's a universal fact.

    2) Based on an argument put forward by my friend Riyaz
    Time Dilation and the special theory of relativity support travel in time to the future via relative observance of velocities in different spatial time frames. But the laws of physics do not support any relative motion to the past, either information or matter.
    Considering the case of matter I don't know, but about information, well it could travel. You might have heard many stories of people who happen to saw dreams and those came true or people who traveled to future and made changes there. Well there might be physiological explanation for those. But the base line is human brains could travel or process faster than speed of light.

    Now that we all have to agree to that fact that brains doesn't stay under the limitation of "photon speed". The first barrier is over, now comes the question are we able to make changes in the future with the capability of brain. Lets give our brains the position of Bluetooth, a source that could act as a master or bot. And that You were able to Utilize your brain reach to 2.44 PM tomorrow. Now its a matter of finding another Master or bot source(brain) which is willing to accept or connect to your source. If that connection is obtained than information passing is achieved.

    Btw I would try to get a copy of that journal and post it here. Please put your taught s if you do have any or if this is of any interest to you.
    Hacking Is a Matter of Time Knowledge and Patience

  3. #3
    I think you are merging Physics with Philosophy.

    Speed of thought is not materialistic and Speed of light is materialistic - its a matter (photon - from electron - a less potential charge in an atom).

    To go in past, you need have discovered something which is materialistic and faster than light. Virtually, impossible.

    The argument should have been proven ages ago.
    It is as simple as this, if you can go in negative velocity, you can go in past.
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  4. #4
    InfoSec Consultant the_empty's Avatar
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    computers and gadgets are not enough...right fb1

    bdw..... this is really nice a thought. Practicality..... well I need to read first before putting any thoughts.

    bluetooth activated sir....

    see u in the future.

  5. #5
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    just my two cents

    this i have not yet read completely but looks simmilar.

    these all basically contradict the point that nothing can beat speed of light.

    also about thoughts, you may consider them non material however thoughts are essentially brain waves and brain waves no matter hos small they may be still form particles of universe and hence can be part of the universal laws.
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  6. #6


    Actually its pretty funny how fiction fashion about TIME-TRAVEL started by H.G Wells with his "The Time Machine" (1895) have always dominated the main-stream's thinking
    about the possibility of travelling in time. Not to mention, its impacts on scientific research.
    The ground-breaking paper by Einstein in magazine Annalen der Physik on the twenty-fifth of November 1915 was the first to spark research works in this
    Here’s the idea. Imagine rolling a marble across a large metal table. Because the table’s surface is flat, the marble will roll in a straight line. But if a fire subsequently engulfs the table, causing it to buckle and swell, a rolling marble will follow a different trajectory because it will be guided by the table’s warped and rutted surface. Einstein argued that a similar idea applies to the fabric of space. Completely empty space is much like the flat table, allowing objects to roll unimpeded along straight lines. But the presence of massive bodies affects the shape of space, somewhat as heat affects the shape of the table’s surface.

    The cosmological principle states the same thing - On a Macro scale, Universe is uniform. Finite energy within a cosmic horizon entails a finite number of particles, be they electrons, protons, neutrons, neutrinos, muons, photons, or any of the other known or as yet unidentified species in the particle bestiary.
    if you’re curious about the details—reveals that the number of distinct possible particle configurations within a cosmic horizon is about 1010122 (a 1 followed by 10122 zeros). This is a huge but decidedly finite number. Needless to say, for us as spectators, Universe is infinite.

    But string theory, theory of parallel universe have already stated that it might be possible to travel in time. If you saw a ball’s speed increase after someone threw it upward, you’d conclude that something was pushing it away from the earth’s surface. The supernova researchers similarly concluded that the unexpected speeding up of the cosmic exodus required something to push outward, something to overwhelm the inward pull of attractive gravity.

    All and all, its a question about Multiverse. If answer is yes, we can travel in time. Till then, any fiction statement might not be satisfying for me.
    Sources : Many.
    P.S : I'm not so much of a physicist. But I'm a bit typhooned with Theory of parallel universe. And as we belong to this state too, computation is here as well -
    Attached Images Attached Images  

  7. #7
    Deja Vu is a relatively common phenomenon amongst the general masses. The human brain is an extremely complex organ and can simulate an environment out of totally unrelated memories. We all have had incredibly ridiculous dreams at some point in life. When subjected to a specific scenario, the brain very well has the ability to create the sensation that you have seen/felt/interacted with the environment before.

    The brain however cannot transmit data without any medium. In physics, for data transmission to occur there has to be a medium or a carrier. According to the wave-particle duality theorem, all matter and waves can be inter-represented. If our brain was capable of sending/projecting data without a medium or carrier, that would break physics.

    Matter cannot travel faster than light for the simple fact that it has mass. At rest, the inertial mass of a body can be explained as follows:
    m = m0/(1-v^2/c^2)^1/2.
    Hence the Energy-mass equation can be written as:
    E = mc^2 where m = the above equation.

    As an object approaches the speed of light, the objects mass increases. This has been proven experimentally. Take a look at the following equation:
    At v = 0.5 times c (where c = speed of light in vaccum, 299798.458 m/s ~3x10^8 m/s)
    we have,
    m = m0/sqrt(1-v^2/c^2) where m0 is inertial mass i.e at rest
    m = m0/sqrt(1-0.25c^2/c^2)
    m = m0/sqrt(0.75)
    m ~ 1.15m0

    As an object approaches the spped of light, its mass increases rapidly. At the speed of light, the mass of the object will be infinity. And an infinite energy would be required as kinetic energy to pusht the body. By the Laws of Thermodynamic, energy can neither be created or destoyed, it can be changed from one form oto another and the total energy in the universe is constant.

  8. #8

    Lightbulb Also Include Multiple Dimensions in Discussions...

    Well I dont agree with those Scientists.

    I think time travel could be possible, we may not have the necessary equipments with us right now.

    I will go forward and say forget speed of light, If an Electron Can Be in Two Places at Once, Why Can't You?

    I feel Physics dont have answers to all the questions.

    Science is always not correct all the time. Which have been seen in the Past.
    We have came from a age where science used to belive ATOM is smallest partical, till the existance of Electrons and photons were prooved.

    Right now we only think in four dimensions (3 dimensions + time). But there could be possibility of existance of more dimensions. Well only sciense has not information of it at this moment doesnt mean those cant exist.

    The 10+1 dimensions
    The idea of attributing dimensions to an object is to describe its geometrical shape. Scientists today require 11 dimensions to describe the shape of space.

    1. A point is a single, structureless entity in space that can be described with a single dimension. A straight line is a serial collection of points that requires one dimension to describe it.

    2. A plane is a parallel collection of lines that requires two dimensions to describe it.

    3. Space as a collection of planes coming under our direct experience and perceptible by the scientific physical sensors is of three dimensions having the Cartesian coordinates X, Y, Z.

    4. Whatever the nature of time, it measures changes in space; the changes in space result in an alteration of its shape; so time is regarded by the scientists as the fourth dimension. The universe is described to be a space-time continuum.

    Thus far it is clear, but where are the other seven dimensions of space?
    The answer is, they are all warped inside the point!

    Scientists explain the warped seven dimensions with the analogy of a hosepipe. Viewed from a distance, the hosepipe appears as a wiggly, one-dimensional line. Every point in the 'line' is, in fact, a little circle around the circumference of the tube.

    Oskar Klein, the Swedish physicist in 1926 suggested that the fifth dimension proposed by Kaluza is not visible because it is shrunken to invisibility, like the 'points' in a hosepipe. Such a point in space is, in reality, a tiny circle going round the fifth dimension. We do not notice the extra dimension of space because it has been "compactified", or rolled up on itself to a very small size. size. Calculations put the circumference of this "tube" of space at about twenty powers of ten smaller than an atomic nucleus--far too small for us to have discerned it directly, even in sub-nuclear particle experiments.

    Scientists today view every point in space, not as a tiny circle, but as a tiny sphere, that warps into seven dimensions. It is calculated by Cartan and other mathematicians that the seven-dimensional or for short the seven sphere is possessed of a number of unique geometrical properties that explain the high symmetry of the sphere.

    With the point becoming a sphere, we can sort of understand the hidden or warped dimensions, though we can't visualize it.

    Why do we require dimensions to describe space?

    Space is the field of activity for the forces in the unverse. Perhaps space itself is a form of the basic energy in the universe. The different kinds of forces in the Newtonian physics were later unified by the scientists into two kinds: gravitational and electro-magnetic forces.

    Albert Einstein, in his general theory of relativity published in 1915, abolished the force of gravity, replacing it by an enigmatic field of geometrical distortion, a warping, or curving, of space-time. According to general relativity, bodies are not pulled by forces of gravity at all, as Newton had claimed centuries before. They simply meander as effortlessly as possible through an underlying warped space-time.* Viewed this way, the curvature of the Earth's orbit around the Sun is not really due to a force of gravity, but is a reflection of the curvature of space-time in the Sun's vicinity.

    Theodor Kaluza, in 1921, for the first time, tried to unify the two forces of gravity and electromagnetism into a single field theory and showed that electromagnetism can be regarded as a form of gravity--and here was the bizarre twist--the gravity of a fifth dimension. The theory abolishes electromagnetic forces, just as Einstein disposed of gravitational forces, and replaces them by warped geometry, this time five-dimensional geometry. In Kaluza's theory, an electromagnetic wave, such as a radio wave, is a ripple in the fifth dimension. The most remarkable feature of the theory is that Einstein's gravitational field equations, when extended to five dimensions, should reproduce exactly the laws of gravity and electromagnetism in the four space-time dimensions of direct experience.

    Today, physicists recognise not two, but four basic forces of nature. In addition to gravity and electromagnetism, two nuclear forces, called weak and strong, have also been discovered. Any successful unified field theory would have to accommodate these two nuclear forces as well.

    In the 1960s and 1970s, the scientists Steven Weinberg Abdus Salam, Sheldon Glashow and others proposed different "grand unified theories" (GUT for short) subsuming three apparently very different sorts of forces (with the exception of gravity).

    As scientists research the microuniverse of the atomic and subatomic particles, they find apparently broken but distinctive symmetries in the structure of the force fields (which they 'gauge fields'). The presence of these crucial symmetries already hints that some sort of hidden geometry is at work in the operation of the forces of nature.

    The story of expansion of the dimensions of space to accommodate and find the hidden symmetries goes on to include what are termed "messenger" particles such as the photons and gluons.
    Last edited by neo; 07-28-2011 at 12:30 PM. Reason: Removed incorrect URL
    Orkut id: neo1981
    Nothing is Impossible*

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  9. #9
    One mor artical I found interesting regarding this:

    Are we missing a dimension of time?

    Could "hypertime" help develop a theory of everything? Roger Highfield reports

    A scientist has put forward the bizarre suggestion that there are two dimensions of time, not the one that we are all familiar with, and even proposed a way to test his heretical idea next year.

    Itzhak Bars explains two time physics
    Telegraph Earth
    Time is no longer a simple line from the past to the future, in a four dimensional world consisting of three dimensions of space and one of time. Instead, the physicist envisages the passage of history as curves embedded in a six dimensions, with four of space and two of time.

    "There isn't just one dimension of time," Itzhak Bars of the University of Southern California in Los Angeles tells New Scientist. "There are two. One whole dimension of time and another of space have until now gone entirely unnoticed by us."

    Bars claims his theory of "two time physics", which he has developed over more than a decade, can help solve problems with current theories of the cosmos and, crucially, has true predictive power that can be tested in a forthcoming particle physics experiment.

    Orkut id: neo1981
    Nothing is Impossible*

    *Conditions Apply

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