Koliko je coveku trebalo da nadmasi brzinu zvuka pa puta jedno milion ce mu trebati da otkrije kako da putuje brzinom svetlosti
Nerealno je pricati o tome, jer ima milion faktora koje covek ne moze ni da dokuci sta bi se desavalo pri takvim brzinama.
Teorija je jedno a praksa je majka.

Ma nesto tesko obzirom da nam ni ovaj hadronski mamut od kolajdera nece da proradi.

Letelica se u toku leta ne bi pomerala u klasicnom smislu te reci, jer bi se umesto pomeranja same letelice pomerao odnosno iskrivljavao prostor oko letelice. Tako da ne verujem da bi letelica uopste bila izlozena uticajem nekakve akceleracije od znacaja. Ali, takva letelica bi bila izlozena drugom vrstom izazova u tom smislu da bi se nalazila u samom sredistu jednog procesa koji deformise samo tkivo prostora, i veliko je pitanje kako odrzati letelicu u jednom takvom ekstremnom ambijentu ukoliko bi se uopste pokazalo da se ovaj warp drive moze realizovati...

Aha, ok. Znaci to nije letelica vec menjac vremeno-prostora. Kako da zakrivimo vremensko prostorni kontinuum?

Stvar je u tome sto uticaj nije samo na prostor/vreme, vec i na sve u okviru toga, znaci i na aome, molekule, .... a to dovodi do toga da se nista ne bi osetilo.

Ama kada se utice na atome i sve ostalo, neko mora da oseti nesto. Svaka promena ima posledicu.

Jok, jer' je uticaj identican za sve. Grubo receno. Ako bi na nekom delu broda bio drugaciji uticaj, on bi bio razlicit od ostatka i drugacije bi se manifestovao. U samom "balonu uticaja" za sve je isto.

Ideja je da se to ucini pomocu neke egzoticne materije, poput negativne energije ili tamne energije, jer je energija potrebna za tako nesto blago receno ogromna ako bi se za to koristila obicna (barionska) materija. Dakle, warp drive je za sada fikcija ali fikcija koja bi uz malo srece eventualno mogla postati stvarnost. A jedino bi nam nesto poput warp drive'a omogucilo intergalakticka putovana...


Evo nekoliko pasusa sa Wikipedia stranice o Alcubierre (warp) drive'u, razjasnjava neke nejasnoce vezane za samu letelicu:

In 1994, the Mexican physicist Miguel Alcubierre proposed a method of stretching space in a wave which would in theory cause the fabric of space ahead of a spacecraft to contract and the space behind it to expand.[1] The ship would ride this wave inside a region known as a warp bubble of flat space. Since the ship is not moving within this bubble, but carried along as the region itself moves, conventional relativistic effects such as time dilation do not apply in the way they would in the case of a ship moving at high velocity through flat spacetime. Also, this method of travel does not actually involve moving faster than light in a local sense, since a light beam within the bubble would still always move faster than the ship; it is only "faster than light" in the sense that, thanks to the contraction of the space in front of it, the ship could reach its destination faster than a light beam restricted to travelling outside the warp bubble. Thus, the Alcubierre drive does not contradict the conventional claim that relativity forbids a slower-than-light object to accelerate to faster-than-light speeds. However, there are no known methods to create such a warp bubble in a region that does not already contain one, or to leave the bubble once inside it, so the Alcubierre drive remains a theoretical concept at this time.


Concept of the Alcubierre drive, showing the opposing regions of expanding and contracting spacetime that propel the central region

The Alcubierre Metric defines the so-called warp drive spacetime. This is a Lorentzian manifold which, if interpreted in the context of general relativity, exhibits features reminiscent of the warp drive from Star Trek: a warp bubble appears in previously flat spacetime and moves off at effectively superluminal speed. Inhabitants of the bubble feel no inertial effects. The object(s) within the bubble are not moving (locally) faster than light, instead, the space around them shifts so that the object(s) arrives at its destination faster than light would in normal space.[3]

Physics of the Alcubierre drive

For those familiar with the effects of special relativity, such as Lorentz contraction and time dilation, the Alcubierre metric has some apparently peculiar aspects. In particular, Alcubierre has shown that even when the ship is accelerating, it travels on a free-fall geodesic. In other words, a ship using the warp to accelerate and decelerate is always in free fall, and the crew would experience no accelerational g-forces. Enormous tidal forces would be present near the edges of the flat-space volume because of the large space curvature there, but by suitable specification of the metric, these would be made very small within the volume occupied by the ship.[1]

The original warp drive metric, and simple variants of it, happen to have the ADM form which is often used in discussing the initial value formulation of general relativity. This may explain the widespread misconception that this spacetime is a solution of the field equation of general relativity. Metrics in ADM form are adapted to a certain family of inertial observers, but these observers are not really physically distinguished from other such families. Alcubierre interpreted his "warp bubble" in terms of a contraction of "space" ahead of the bubble and an expansion behind. But this interpretation might be misleading,[4] since the contraction and expansion actually refers to the relative motion of nearby members of the family of ADM observers.

In general relativity, one often first specifies a plausible distribution of matter and energy, and then finds the geometry of the spacetime associated with it; but it is also possible to run the Einstein field equations in the other direction, first specifying a metric and then finding the energy-momentum tensor associated with it, and this is what Alcubierre did in building his metric. This practice means that the solution can violate various energy conditions and require exotic matter. The need for exotic matter leads to questions about whether it is actually possible to find a way to distribute the matter in an initial spacetime which lacks a "warp bubble" in such a way that the bubble will be created at a later time. Yet another problem is that, according to Serguei Krasnikov,[5] it would be impossible to generate the bubble without being able to force the exotic matter to move at locally FTL speeds, which would require the existence of tachyons. Some methods have been suggested which would avoid the problem of tachyonic motion, but would probably generate a naked singularity at the front of the bubble.[6][7]

Mislio sam na spoljasnost, oko broda. Glupa usporedba, ali kao sto sigurno nije zdravo stati iza mlaznog motora kada se daje gas (ili ispred usisnika ), tako verovatno nece biti zdravo stajati ispred ili iza broda sa worp pogonom. Ako poredim dalje, kao sto vreli gasovi sprze travu iza mesta poletanja, kao sto ti vreli gasovi zagrevaju atmosferu, kao sto avioni presecaju putanje ptica i aerodromi narusavaju njihova stanista, tako i worp mora imati uticaj na nas vremensko-prostorni kontinuum garantovano. Ali to je daleka prica.
 Svuda se spominje izmena prostor-vremena ispred i iza mehura u kome je letilica u svom stabilnom vremn-prostoru. Sta ce to ciniti neprobojnu granicu izmedju mehura i okoline i sta ce to menjati prostor-vreme ispred i iza letilice, ne koja energija je potrebna (ostavimo to, recimo da imamo izvor energije), ali kako se to menja, koji je "mehanizam" te promene. Sta treba da se desi da se to desi i kako to kontrolisati.
Da li mi imamo uopste sigurne podatke o otme da se prostor i vreme "krive" i u kom slucaju?
Kada dolazi do "krivljenja" ("sabijanja, sirenja") prostorno vremenskog kontinuuma? To je mislim esencijalno pitanje. To je sve jos na zescem teorijskom nivou. Ali, ko trazi taj i nadje.
 

Svaka masa/energija samim svojim prisustvom zakrivljuje tkivo prostor-vremena tu gde se nalazi, i sila gravitacije je primera radi samo manifestacija zakrivljenosti prostor-vremena prouzrokovana prisustvom nekog masivnog svemirskog tela (naravno, i manjih tela ali tu vec bez golim okom vidljivog efekta). Ali, cak i najmasivnije zvezde imaju relativno skroman efekat na prostor-vremensko tkivo, u smislu da ga ne zakrivljuju vise od stvaranja jednog manjeg "udubljenja" na prostor-vremenskom tkivu dok bi za warp drive bilo potrebno stvoriti jedno zakrivljenje prostor-vremenskog tkiva nalik na Grand Canyonu. A posto i najmasivnije zvezde stvaraju tek manja udubljenja, mislim da je onda jasno o kolikim bi se tu energijama radilo (da ne bude zabune, masa ili energija, svejedno je, jer masa i energija su u sustini ista stvar ili kao sto jedna mudra glava rece e=m*c^2 ).

Inace, u praksi bi se neki prostor mogao zakriviti tako sto bi se neka tacka ili regija (tj. skup tacaka) u svemiru gadjala sa razlicitih strana nekim visoko koncentrisanim oblikom energije poput lasera (laser kao svaki oblik svetlosti se sastoji od fotona koji nemaju masu ali imaju energiju). Koncentracija velike kolicine energije na tim tackama prouzrokovala bi veliko zakrivljenje prostor-vremenskog tkiva, a ako su energije tih lasera dovoljno velike onda bi se prostor-vremensko tkivo moglo zakriviti dovoljno za stvaranje jednog warp drive "mehura". Naravno, da bi se dobio bas onakav oblik zakrivljenja kakvim bi se stvorio warp drive "mehur", kolicina i distribicuja te energije na tom delu prostor-vremenskog tkiva mora biti rasporedjena oko polozaja mehura (i letelice u njoj) na veoma odredjen nacin, isto kao i kada bi se ilustracije radi neki slican efekat napravio u vodi (ova analogija sa vodom ima smisla jer i gravitacija i zakrivljenje prostor-vremenskog tkiva funkcionise po istom principu talasa).