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PostPosted: 29 Aug 2013, 23:36 
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Θα έχετε ακούσει ίσως για την πρωτοποριακη δουλεια του Aulcubierre την δεκαετια του 90 που για πρωτη φορα εδειξε ότι το warp speed ειναι έστω και θεωρητικά δυνατόν. Τελευταίως έχουν ξεκινήσει πρακτικές έρευνες με στόχο να διαπιστωσουν αν και πως είναι δυνατόν:

http://www.blastr.com/2012/09/deep_spac ... come_n.php
http://www.blastr.com/2013-8-28/enterpr ... warp-drive


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PostPosted: 30 Aug 2013, 10:23 
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Στο Space.com εξηγεί την θεωρία καλύτερα: http://www.space.com/21140-star-trek-warp-drive-possible.html

I am better at this in English, because most of my physics studies are in English. You have to get around the universal speed limit which is the speed of light. And this is according to Einstein's theory of relativity. In order to travel at the speed of light, you need to be massless or your mass becomes infinite (according to the equations of general relativity). Also, accelerating to the speed of light needs infinite energy. Which means that nothing can travel faster than the speed of light. Neutrinos having small mass travel at near the speed of light but not at the speed of light.

What they are proposing though is different: it is not the object that will travel at that speed; rather they will bend spacetime, contract it in front as to move the object in a bubble that contracts spacetime in front of the object. And because this needs a lot of energy they are trying to harness vacuum energy. What is vacuum energy? According to quantum mechanics, empty space is not empty. At least not in physical terms. What are called virtual particles, usually a matter-antimatter pair, pop up and get destroyed all the time. Vacuum has potential energy, and it is this energy they are trying to harness. I do not know the details of this, and we will have to wait and see what they come up with.

In the above article it explains the experiment, but not how they are going to warp spacetime. I will probably have to wait for the paper if they succeed.


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PostPosted: 30 Aug 2013, 15:35 
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Τα πιο πρόσφατα άρθρα που πέτυχα μεταξύ άλλων τον τελευταίο καιρό σχετικά:

http://www.nytimes.com/2013/07/23/scien ... hare&_r=1&
http://www.newscientist.com/article/mg2 ... hY4ruC-JSo

Είναι καταπλητικό δε το ότι χρησιμοποιούν και όρους όπως "warp bubble" αυτούσιους οπως στο Star Trek!
Σιγά-σιγά προχωράει η έρευνα πάντως. Είναι ενδιαφέρον μεταξύ άλλων αυτό που λέγεται στο δεύτερο από τα δύο παραπάνω links, σχετικά με τη μείωση της απαιτούμενης ενέργειας, η οποία θεωρούνταν από την αρχή της έρευνας για warp drive από τα μεγαλύτερα εμπόδια:

Quote:
When the idea was first proposed mathematically in 1994 it required a vast amount of negative vacuum energy which made the idea seem impossible. I did some work in 2011 and 2012 as part of the 100 Year Starship symposium and discovered ways to reduce the energy requirements by many orders of magnitude, so for a 10-metre diameter spacecraft with a velocity of 10 times light speed, I can reduce the negative energy needed.

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PostPosted: 10 Sep 2013, 21:54 
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Σε αυτό το άρθρο γράφεται εντελώς αυθαίρετα (δεν μπορώ να φανταστώ πώς και γιατί) η εξής ψευδής δήλωση:
Quote:
Alcubierre's warp drive theory was retroactively incorporated into the "Star Trek" mythos by the 1990s TV series "Star Trek: The Next Generation."

O Rick Sternbach, σε σχόλιό του το οποίο ανάρτησε και στο Facebook και το οποίο κοινοποιήθηκε και από τους Michael & Denise Okuda, απαντά και βάζει τα πράγματα στη θέση τους:
Quote:
Nope. Mike Okuda and I, artists and technical consultants on the show, wrote the Star Trek: The Next Generation Technical Manual in 1991, having never previously heard of Alcubierre, and having furnished sci/tech notes about invented warp drive physics to the writers and producers since the beginning of TNG back in 1987. We did discuss cracking the c barrier with a number of other scientists and engineers, particularly Dr. Steve Howe, formerly with the Los Alamos National Laboratory.

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PostPosted: 11 Sep 2013, 01:04 
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Μερικά links από τη wikipedia.
http://www.cbsnews.com/8301-205_162-575 ... -feasible/
http://news.bbc.co.uk/2/hi/science/nature/364496.stm
http://news.discovery.com/space/history ... 120917.htm

Εντούτοις, φαίνεται ότι η ενέργεια που ξοδεύεται για να καμπυλωθεί το διάστημα είναι πολύ, πολύ περισσότερη από όσο είναι πρακτικά εφικτό...


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PostPosted: 01 May 2014, 17:21 
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Joined: 26 Sep 2013, 23:59
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Είναι θαυμάσιο που η NASA αφιερώνει ένα μικρό μέρος των κονδυλίων της για την έρευνα σχετικά με την δυνατότητα κατασκευής ενός warp drive.

Ένα ενδιαφέρον άρθρο που παρουσιάζει τα πράγματα στην πραγματική τους διάσταση σχετικά με το συγκεκριμένο ερευνητικό πρόγραμμα της διαστημικής υπηρεσίας στο παρακάτω link

http://spaceref.com/nasa-hack-space/propulsion/clarifying-nasas-warp-drive-program.html.

Επίσης, η ίδια η NASA έχει την δική της σελίδα-overview σχετικά με την συγκεκριμένη τεχνολογία.

http://www.nasa.gov/centers/glenn/technology/warp/warp.html.


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PostPosted: 11 Jun 2014, 15:55 
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Διαβαζα αυτό το άρθρο σήμερα, το οποίο παρουσιάζει concept designs, βασισμένα στις θεωρητικές έρευνες του δρ. Dr. Harold White της NASA σχετικά με το warp drive:

"NASA's real life Enterprise may take us to other star systems one day"


http://sploid.gizmodo.com/holy-crap-nas ... 1589001939

Ποιός δεν θα ήθελε να ταξιδέψει με ένα τέτοιο διαστημόπλοιο!? :)


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PostPosted: 11 Jun 2014, 16:34 
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Ένα ακόμη ενδιαφέρον link!

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PostPosted: 11 Jun 2014, 16:39 
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Πέρα από το όνομα (Enterprise, τι άλλο θα ήταν, φυσικά!), παρατηρήσατε και τα logo, ε; :D Life imitating art... Input σε αυτά είχε και ο Michael Okuda!

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