|
|
You Can't Travel Back in Time, Scientists Say
[Copy link]
|
|
|
Originally posted by wei_loon5063 at 25-6-2007 09:37 PM
wa macha... long story eh.....
how to begin eh.....
ermm......
you know quantum mechanics, string theory? what it is? how strings of nothing but energy vibrate that create atoms...
these atoms create molecules and then cell and then consciousness..... get it? Biology...
how your mind works la.. your mind from cell right? cell? from atom.. atom? from quarks.. quarks? from strings of enery..
what is energy? can you see, listen, smell or taste energy? no... yet you feel it and it exist and you know it is there..
haiyaaaa i want to know bout gravity well la. perkataan gravity well pun aku tak nampak atas nih let alone explanation bout it. help me la for my quest to gravity well  |
|
|
|
|
|
|
|
|
|
|
|
Originally posted by cipanbakar at 26-6-2007 07:12 PM
haiyaaaa i want to know bout gravity well la. perkataan gravity well pun aku tak nampak atas nih let alone explanation bout it. help me la for my quest to gravity well
first imagine x,y,z and time.... put one a piece of paper.. flat paper.......
ok?
then the mass...........the mass will pull the paper of x,y,z and time down like below.... the so called well you see is gravitationala well.... the tunnel is worm hole la
 |
|
|
|
|
|
|
|
|
|
|
|
why the space warp to narrow cone shape? y not sphere?
ahh tonight need to chat with my sweetheart at @15. lambat kang marah pulak. see u tomoro |
|
|
|
|
|
|
|
|
|
|
|
Reply #143 cipanbakar's post
that is the symbol that represent that the space time being pulled.....
sweet heart? the academi fantasia one? :cak:
banyak nakal ko |
|
|
|
|
|
|
|
|
|
|
|
Reply #142 wei_loon5063's post
you know wei loon...
I am really weak when to imagine things from graph.... |
|
|
|
|
|
|
|
|
|
|
|
Reply #145 ussopp's post
I am good at imagining but not good at solving statistically  |
|
|
|
|
|
|
|
|
|
|
|
kalau guna astral??? |
|
|
|
|
|
|
|
|
|
|
|
Reply #149 wei_loon5063's post
wow.... ur so sensitive....  |
|
|
|
|
|
|
|
|
|
|
|
Reply #151 wei_loon5063's post
|
thats nice.... now, i want to ask something.... has the future been constructed? |
|
|
|
|
|
|
|
|
|
|
|
Originally posted by aku_EnSeM at 3-7-2007 05:42 PM 
thats nice.... now, i want to ask something.... has the future been constructed?
not quite.... I`ve watch a japanese anime.. about the guy that see future in his dream... then the witchdoctor say dream or anything in our mind is something possible... but not certain... like probalitity tree.... it is one of the possibilities... but how close we get there depend on what we do now |
|
|
|
|
|
|
|
|
|
|
|
Time Travel Machine Outlined Charles Q. Choi
Special to LiveScience
LiveScience.com
Mon Aug 20, 11:55 AM ET
A new concept for a time machine could possibly enable distant future generations to travel into the past, research now suggests.
Unlike past ideas for time machines, this new concept does not require exotic, theoretical forms of matter. Still, this new idea requires technology far more advanced than anything existing today, and major questions remain as to whether any time machine would ever prove stable enough to enable actual travel back in time.
Time machine researchers often investigate gravity, which essentially arises when matter bends space and time. Time travel research is based on bending space-time so far that time lines actually turn back on themselves to form a loop, technically known as a "closed time-like curve."
"We know that bending does happen all the time, but we want the bending to be strong enough and to take a special form where the lines of time make closed loops," said theoretical physicist Amos Ori at the Technion-Israel Institute of Technology in Haifa. "We are trying to find out if it is possible to manipulate space-time to develop in such a way."
Many scientists are skeptical as to whether or not time travel is possible. For instance, time machines often are thought to need an exotic form of matter with so-called "negative energy density." Such exotic matter has bizarre properties, including moving in the opposite direction of normal matter when pushed. Such matter could theoretically exist, but if it did, it might be present only in quantities too small for the construction of a time machine.
Ori's latest research suggests time machines are possible without exotic matter, eliminating a barrier to time travel. His work begins with a donut-shaped hole enveloped within a sphere of normal matter.
"We're talking about these closed loops of time, and the simplest kind of closed loops are circles, which is why we have this ring-shaped hole," Ori explained.
Inside this donut-shaped vacuum, space-time could get bent upon itself using focused gravitational fields to form a closed time-like curve. To go back in time, a traveler would race around inside the donut, going further back into the past with each lap.
"The machine is space-time itself," Ori said. "If we were to create an area with a warp like this in space that would enable time lines to close on themselves, it might enable future generations to return to visit our time."
Ori emphasized one significant limitation of this time machine |
|
|
|
|
|
|
|
|
|
matwalla This user has been deleted
|
Reply #155 Png_Prince's post
In the framework of General Relativity (GR) alone time travel can be shown mathematically but when Hawking start to consider combination with Quantum Mechanics (QM), base on the very basic concept of uncertainty principle he had shown the impossibility of time travel in his paper on chronological protection conjecture. Since then there are papers in the unified fields of GR and QM such as string , loop quantum grav..have tried to address the problems..some agree some may not with time travel. Some may not even agree with the existence of wormhole (ie Leonard Suskind from Stanford) ....but ofcourse many more agree (Michau Kaku of CUNY). Some just agree that wormhole is possible but sceptical with time travel (Hawking, Kipp S Thorn of Caltech). When people like Ed Whitten (of Princeton) introduce M-theory...and then Lisa Randall and Arkani Hameed (of Harvard) shows universe as just a lesser membrane floating in bulk of higher extradimensions...things of possibilities are vast.
To me; maybe nothing of standard model-obeyed-particle (including photon) are incapable to escape form a membrane ..(nothing can escape from this universe) therefore unless one can escape from the Universe one can do time travel. |
|
|
|
|
|
|
|
|
|
matwalla This user has been deleted
|
Reply #156 matwalla's post
should've been.....
...maybe nothing of standard model-obeyed-particle (including photon) are capable to escape from a membrane ..(nothing can escape from this universe)...
hai tersasul lak bila cak omputih nih.... |
|
|
|
|
|
|
|
|
|
|
|
Reply #158 tai_digidestany's post
|
John Titor ni penipu. Semua ramalan dia tak menjadi. |
|
|
|
|
|
|
|
|
|
|
|
|
mana tak menjadi? FYI, suma ramalan dier tu cuma subjektif dan bukannya secara fizikal yang mampu dilihat mata kita. Ingat lagi dia meramal akan ada lima perang saudara di US pada tahun 2005? Sebenarnya dia memberi hint kepada 5 taufan yang telah melanda USA sampai kerosakan yang dibuat begitu teruk sekali. Dua daripadanya Katrina & Rita. |
|
|
|
|
|
|
|
|
|
|
|
Reply #160 tai_digidestany's post
lagi2..apa kebarangkalian yg dia uat? yg betul?  |
|
|
|
|
|
|
|
|
|
| |
Category: Belia & Informasi
|
Post time 26-6-2007 07:12 PM
Post time 28-6-2007 09:23 AM
!!!!!!!
Author
