A wormhole is a hypothetical geometric bridge between separate regions of space-time. The equations allow us to describe it; keeping it open and turning it into a temporary machine is another story.
What really is a wormhole?
In general relativity, gravity is not a force that acts on a stationary stage: it is the curvature of space-time itself. Some mathematical solutions contain two regions connected by a throat. The popular image of the tunnel is useful, but it should not be confused with a conduit dug into outer space: the shortcut is geometry.
The Einstein–Rosen bridge associated with an ideal black hole is not traversable. Morris and Thorne's models studied what conditions a gorge would have to meet for a person to be able to cross it without encountering a horizon or destructive tidal forces. The result made the traversable wormhole a rigorous tool for asking where the possibilities of relativity end.
From space shortcut to time machine
Let's assume two connected mouths. If one of them makes a trip at relativistic speed and returns, or remains near an intense gravitational field, it will accumulate less proper time than the other. The internal connection can preserve the phase shift. Entering through one mouth and leaving through the other would allow us to reach an earlier moment with respect to the outside. The machine would not travel to a date prior to its creation: the phase shift would begin when the mouths were synchronized and separated.
The decisive obstacle
The throat tends to collapse. In standard general relativity, holding it requires violating energy conditions, in particular the averaged zero energy condition. This distribution is called exotic matter: it is not antimatter or an unknown mineral, but an energy pattern with unusual gravitational properties. Quantum theory produces local negative densities, but we do not know how to accumulate them on the necessary scale and form.
What would have to be resolved
Create or find a suitable topology.
Stabilize the throat with energy compatible with quantum inequalities.
Limit radiation, feedback and tidal forces.
Prevent the formation of closed temporal curves from destroying the configuration.
That's why wormholes are valuable even if they can never be built: they connect exotic matter, chronological protection and quantum gravity in a single experimentally honest question.
Únete a la comunidad y recibe como bienvenida una selección de cortometrajes sobre viajes en el tiempo. Después, te enviaremos nuevos análisis, paradojas y hallazgos sin ruido ni spam.
5 lessonsES · ENPhilosophy + consciousness
THE NEXT JOURNEY BEGINS WITH A QUESTION
You cannot return to the past. But you can change how you inhabit time.
Go beyond equations and explore what time reveals about your identity, your freedom and the responsibility of every choice. Five lessons connecting philosophy, consciousness, paradoxes and ethics.
Online course in Spanish and English · External access at TimeTravelers.cc
Gestionar consentimiento
Para ofrecer las mejores experiencias, utilizamos tecnologías como las cookies para almacenar y/o acceder a la información del dispositivo. El consentimiento de estas tecnologías nos permitirá procesar datos como el comportamiento de navegación o las identificaciones únicas en este sitio. No consentir o retirar el consentimiento, puede afectar negativamente a ciertas características y funciones.
Funcional
Always active
Technical storage or access is strictly necessary for the legitimate purpose of allowing the use of a specific service explicitly requested by the subscriber or user, or solely for the purpose of carrying out the transmission of a communication over an electronic communications network.
Preferences
Technical storage or access is necessary for the legitimate purpose of storing preferences not requested by the subscriber or user.
Statistics
Technical storage or access that is used exclusively for statistical purposes.The storage or technical access that is used exclusively for anonymous statistical purposes. Without a requirement, voluntary compliance by your Internet service provider, or additional records from a third party, the information stored or retrieved solely for this purpose cannot be used to identify you.
Marketing
The storage or technical access is necessary to create user profiles to send advertising, or to track the user on a website or across multiple websites for similar marketing purposes.