Questions tagged [spacetime-dimensions]

Concerning dimensions of space and time, whether our 3-space + 1-time or other dimensions.

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11 votes
4 answers
3k views

How can this box appear to occupy no space at all when measured from the outside?

In my story, there is a 10 meter wide room with a 'special box' in the middle. The box is represented in the picture with the blue outline. The box is 2.5 meters wide. So when you measure from the ...
1 vote
2 answers
115 views

Theoretically, would anti-gravity have a temporal component and if so what would that be? [closed]

This is purely speculative since we don’t know if we can actually create anti-gravity. Gravity and Time are two of the biggest mysteries in our universe. We don’t know why gravity is so weak or where ...
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8 votes
10 answers
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Teleportation without loss of consciousness

Trying to figure out a method for a teleportation machine that definitely does NOT "kill" the user in any way. The big thing is preventing a loss of consciousness during the process. Even if ...
0 votes
1 answer
126 views

Would the dimensions of hyperspace be the 4th, 5th, and 6th spatial dimensions? [closed]

The dimensions of our world are X, Y, and Z; while the dimensions of hyperspace are X’, Y’, and Z’. So, the extra dimensional theories all state that the extra dimensions are inside of the observable ...
4 votes
2 answers
175 views

Steering Alcubierre bubble?

So the question is - let's pretend we managed problems with exotic matter and/or energy (there are theoretical solutions without exotic matter, with only positive energy https://iopscience.iop.org/...
3 votes
1 answer
115 views

Does my concept for an "ergosphere highway" make scientific sense?

In my current science-based project, I have this idea for a string of rotating black holes (bonus points if you can figure out how they can be lined up without gravitating towards each other) that are ...
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26 votes
13 answers
6k views

Is there a good geometric analogy for a 'trap' dimension that you can stumble into easily but is very hard to exit?

I have a magical children’s fantasy land, which is bordered by mountains on its northern side. I want to make it so that anyone travelling too far north is likely to enter one of many trap pocket ...
8 votes
4 answers
222 views

Viewing the whole timeline from another temporal axis; why can't the first temporal dimension look back and see the future of the time travellers?

Introduction A common image in time travel stories is an image of all time, either as a line or a tree form. Take this image from Loki as an example: So a time traveller's organisation, like the one ...
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19 votes
4 answers
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Celestial navigation in a 4D universe

4D objects can rotate in two independent planes simultaneously, giving them 2 equators (great circles where the planes of rotation intersect the surface) and no poles. Both equators are objectively ...
15 votes
8 answers
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How is it possible that some extra-dimensional pouches can store living things while others can't?

The extra-dimensional pouch is a portable and lightweight container that is capable of storing almost unlimited tangible objects of any sizes inside a pocket dimension, but why might certain extra ...
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17 votes
10 answers
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How would a radar work while inside a FTL dimension?

In my universe FTL drives are easily mass manufactured and most citizens own them and use them. The FTL drives work by compressing a certain powder which then explodes, ripping open a wormhole which ...
4 votes
7 answers
380 views

Creatures which can be mortal in one dimension and immortal in another dimension, How do I avoid time freezing forever?

These beings can live a normal life, except they switch dimensions, their body still remains in the same place. But almost as if time froze, they are transported in another world, an infinite ...
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-1 votes
2 answers
131 views

Would an inter-dimensional being need to eat? [closed]

Would a being that could enter any space in any time, assume any shape, need sustenance or a source of energy to stay alive or does their very existence as inter-dimensional beings imply that they are ...
12 votes
15 answers
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How do Time Keepers log their diaries?

Set in distant future, a group of super advance civilization formed a special task force to observe and guard timelines, and they are called Time Keepers. The Time Keepers will scan for spacetime ...
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2 votes
2 answers
157 views

How can the number of inconsistencies within a universe increase with successive patches?

Gods are all powerful beings who are eternal and have existed within the past, present, and future of a universe's timeline. However, every god also had a beginning. These beings were once mortals who ...
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2 votes
5 answers
127 views

What tests might someone do to assess possible brain damage from time travel? [closed]

I have a character who travels in time, but after making major jumps (like 100 years forward), she begins experiencing side effects—first nose bleeds, but the symptoms begin to increase to things like ...
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6 votes
3 answers
145 views

Nesting abilities of migratory interdimensional creature

I'm waving hands a fair bit here, and I am doing that because I believe that it is internally coherent, so if you accept these things, you shouldn't need the story to suggest answers. I'm including as ...
2 votes
1 answer
177 views

How could 4th Dimensional "pockets" of space form in a 3D world, and how would 3D objects entering and exiting this space appear to observers?

I was inspired by a story that describes an event where many people die on a large industrial ship, and the 'cover up' story stated that the ship entered the 4th dimension, and when the ship appeared ...
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5 votes
3 answers
933 views

Can my 3-Dimensional-Space character orbit around a 4-Dimensional-Space planet?

The setting is as follows: a 3-Dimensional-Space(3-DS) character/Spaceship has entered the 4-DS and has encountered a planet (from far away). Now he wants to orbit around it, but the planet is a 4-DS ...
1 vote
5 answers
620 views

How can I implement time travel on a somewhat realistic way?

Requirements for answer: -hypothetically can work (I don’t care if it’s hard or energy expansive) Made by Mankind Can be used at any time preferably works for going to the past it’s enough if I ...
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8 votes
2 answers
396 views

Using transfinite numbers in a scifi story

I have been bandying about some exotic mathematics ideas as the basis for a hard scifi setting, and I wonder what technology/alien life would "make sense," here, given the physics arising ...
3 votes
1 answer
179 views

In fictional world with two time dimensions could I still keep laws of thermodynamics as they are in modern physics? [closed]

There was this question about spacetime with two time dimensions here, but I wonder what could that mean particularly for thermodynamics? To be more precise, could such a universe (none of dimensions ...
8 votes
5 answers
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Why would a five dimensional creature need memories?

We human lives in a four dimensional universe: three spatial dimensions and one dimension for time. We feel the flow of time as experiential due to the fact that our brain saves past experiences into ...
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6 votes
4 answers
248 views

Existence of elementary particles in an hysteretic space-time

I am toying for a while with the idea of an hysteretic space-time. Hysteresis is the dependence of the state of a system on its history. Though it could make for some interesting twists in the world,...
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1 vote
3 answers
139 views

Effect of opening up a hyperspace portal on a planet surface? [closed]

Let's say we know how to enter hyperspace. Someone decides it's a good idea to open a "portal" into hyperspace on the planet surface. (I'm assuming this would take a fair amount of energy?) ...
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2 votes
2 answers
158 views

Should I allow my teleporter to maintain his momentum after a teleport? [closed]

So I've designed a si-fi rpg with my friends that uses a mixture of magic and tech. One of my players is magically a teleporter and wants to know if his teleports would maintain his current velocity ...
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4 votes
3 answers
183 views

A Semi-Complex, yet fictional explanation for the possibility of portals or wormholes

I am working on a Young Adult fictional story that is based upon the ability for humans to travel through portals. I have done a little research about portals, an idea that has always been interesting ...
-3 votes
2 answers
839 views

Superpowers of a 5-Dimensional Being [closed]

So, I have seen the superpowers of a 4-Dimensional Being pop up a few times on this site. However, I will instead talk about the powers of a being with one extra dimension, making them a 5-Dimensional ...
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3 votes
4 answers
180 views

Is it possible to make up a self consistent quantum gravity for a fictional universe?

I understand that for real world physics the current Theory of Quantum Mechanics, and current Theory of General Relativity are incompatible. I'm thinking about how one thing different about ...
11 votes
9 answers
6k views

How would a higher-dimensional being enter a lower dimension?

So I could not get any answers for my previous question regarding what happens in a indeterministic world such as the worlds in a Cauchy Horizon of a Reissner Nördstrom Black Hole. However, I ...
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0 votes
1 answer
203 views

What can happen in a non-deterministic world? [closed]

I was reading about a theoretical charged Black Hole known as the Reissner Nördstrom Black Hole, where should someone enter its Cauchy Horizon, will end up in a world not bound by determinism. What ...
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2 votes
2 answers
158 views

Could aliens from beyond the singularity of a rotating black hole survive and colonise regions of a normal universe?

Would it be possible for aliens that originated and evolved in a planetary system beyond the ring singularity of a rotating black hole to send individuals out into a normal universe to colonise it? Or ...
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10 votes
5 answers
559 views

Is three-dimensional time consistent and paradox-free for time/dimension travelers?

This question was edited based on answers already submitted. I am designing a universe with both time travel and alternate realities, but I don't want the whole thing resting on hand-waving and ...
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3 votes
2 answers
201 views

How would wormholes and teleportation affect the passage of time?

Time is not a constant, Albert Einstein proved that much. Time dilation is a difference in the elapsed time measured by two clocks, either due to them having a velocity relative to each other, or by ...
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7 votes
2 answers
174 views

Formula for send and response times of messages at fraction of light speed?

I have a ship that begins the equation traveling at 50 percent the speed of light, but decelerating constantly to finally land on a certain planet (towards which it is moving the entire time). It ...
2 votes
1 answer
167 views

Message sent to a ship traveling away at 37.5% light speed? [closed]

I have a ship traveling away from Earth at around 37.5 percent of light speed. How long will a message take to reach first Earth, and then a response to reach the ship, both from Earth perspective and ...
3 votes
6 answers
1k views

What would a two-dimensional world look like?

As we know our real world is (if we ignore extreme physical theories) three-dimensional. I wonder what a two-dimensional world would look like and if live would be possible. In my opinion many ...
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5 votes
9 answers
453 views

Technology to see an invisible being

I have a world where there are two types of beings. One type, let's call them X, exist in our "dimension," and the other, let's call them Y, exist in another "phase" or dimension. Only 10% of X ...
1 vote
1 answer
187 views

What are some modern policies that can be applied to or improve 17th-century European society? [closed]

Supposedly, a relatively smart + educated young woman from modern society is transmigrated into a body of a woman living in a country that is similar to 17th-century Europe. Monarchy and nobility ...
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4 votes
5 answers
2k views

What would the experience be like for a human transported to 4 dimensions?

Our universe has 3 global spatial dimensions - that much I know. I am almost sure, based on an incredibly shoddy knowledge of physics, that there couldn't possibly be a 4th spatial dimension that we ...
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45 votes
13 answers
12k views

What does it actually mean to have two time dimensions?

The trivial answer is that it just means "you have two dimensions with inverted sign in your spacetime metric". But the perceptual result of that kind of choice doesn't actually look qualitatively ...
7 votes
1 answer
345 views

Schwarzschild Metric in a universe with the same space time metric as that described in the orthogonal series, but with massive gravitons?

The universe described in the orthogonal series http://www.gregegan.net/ORTHOGONAL/00/PM.html is one, in which the minus sign in the space time interval is replaced with a plus sign. So this universe ...
9 votes
5 answers
421 views

Sanity check: 4D bio-wheels

In our 3D world, it is basically impossible to evolve living wheels, or helicopter rotors, or anything similar because free rotation of an axle dictates that there is no fixed connection to the body ...
13 votes
2 answers
956 views

Body plan of a 4D human-analog?

I am attempting to design aliens that live in a universe with a 4+1 space-time--i.e., a universe with four orthogonal spatial dimensions, rather than three, in addition to a fifth time dimension. In ...
7 votes
4 answers
2k views

Aliens in a 4D universe try to explore our 3D spacetime fabric: How can they do it?

They do not necessarily meet humans and try to interact with them. This question is more about the technical possibility/impossibility of 4D aliens being able to "analyze" the inner structure of our ...
4 votes
3 answers
567 views

Can mass be shunted off into hyperspace, but the matter remains?

My question is this: can excess mass be bled off into hyperspace (the large and compact extra dimensions, not the Star Wars-esque swirling vortex), yet the matter remains in our universe? Is mass too ...
9 votes
4 answers
448 views

How can a species of natural time-travelers have a meaningful society?

Consider a fantasy species of "natural" time travelers. To define some specifics: Relevant Rules While it is not effortless, this species can move against the "arrow of time" much as a human can ...
12 votes
3 answers
552 views

What goes in, must come out - limitations of temporal displacement

I am plotting out a sci-fi setting, and trying to figure out the consequences of a non-conventional form of time travel. In the story, time travel has been achieved by means of temporal displacement....
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1 vote
3 answers
280 views

Is it possible for two dimensions to exist on one planet? [closed]

I'm writing a fantasy comics and I am stuck on a particular idea. Imagine if Hell existed on our planet. Like hell is here, we simply cannot see it, because there is an invisible barrier between the ...
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3 votes
0 answers
314 views

What would the periodic table look like in 2 dimensions? [closed]

I've read this question What would the periodic table of a 4-Dimensional universe look like?, and I think it answers part of my question about how atomic physics would work, but I'm not sure. Would a ...
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