Questions tagged [spacetime-dimensions]

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

Filter by
Sorted by
Tagged with
18 votes
4 answers
1k views

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 ...
user avatar
15 votes
8 answers
3k views

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 ...
user avatar
  • 45.9k
17 votes
10 answers
4k views

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 ...
user avatar
4 votes
7 answers
257 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 ...
user avatar
  • 1,732
-1 votes
2 answers
95 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 ...
user avatar
12 votes
15 answers
3k views

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 ...
user avatar
  • 45.9k
2 votes
2 answers
136 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 ...
user avatar
  • 38k
2 votes
5 answers
113 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 ...
user avatar
  • 490
6 votes
3 answers
129 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 ...
user avatar
2 votes
1 answer
130 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 ...
user avatar
  • 31
5 votes
3 answers
893 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 ...
user avatar
1 vote
5 answers
595 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 ...
user avatar
8 votes
2 answers
329 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 ...
user avatar
3 votes
1 answer
142 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 ...
user avatar
8 votes
5 answers
2k views

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 ...
user avatar
  • 45.9k
6 votes
4 answers
237 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,...
user avatar
  • 236k
1 vote
3 answers
110 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?) ...
user avatar
  • 1,007
2 votes
2 answers
150 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 ...
user avatar
  • 21
4 votes
3 answers
167 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 ...
user avatar
-3 votes
2 answers
644 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 ...
user avatar
  • 2,855
3 votes
4 answers
166 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 ...
user avatar
12 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 ...
user avatar
  • 2,855
0 votes
1 answer
194 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 ...
user avatar
  • 2,855
2 votes
2 answers
150 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 ...
user avatar
  • 11.7k
10 votes
5 answers
481 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 ...
user avatar
  • 51.4k
3 votes
2 answers
180 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 ...
user avatar
7 votes
2 answers
153 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 ...
user avatar
2 votes
1 answer
166 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 ...
user avatar
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 ...
user avatar
  • 123
4 votes
9 answers
376 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 ...
user avatar
1 vote
1 answer
182 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 ...
user avatar
  • 19
3 votes
5 answers
762 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 ...
user avatar
  • 139
45 votes
13 answers
11k 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 ...
user avatar
7 votes
1 answer
334 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 ...
user avatar
9 votes
5 answers
404 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 ...
user avatar
12 votes
2 answers
839 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 ...
user avatar
7 votes
4 answers
1k 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 ...
user avatar
4 votes
3 answers
561 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 ...
user avatar
9 votes
4 answers
396 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 ...
user avatar
12 votes
3 answers
521 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....
user avatar
1 vote
3 answers
265 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 ...
user avatar
  • 941
3 votes
0 answers
264 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 ...
user avatar
  • 632
4 votes
3 answers
235 views

How do one teach thermodynamics to Higher dimensional beings?

Suppose an entity from a higher dimensions who can experience time flowing both forward and backward wants to understand our world and how far humanity have advanced in tech and science, is it ...
user avatar
  • 45.9k
10 votes
2 answers
647 views

How to feed parity transformed John Doe?

We do not know how exactly it happened, but poor John Doe made a space-time trip along a three dimensional analog of a Möbius strip (a Klein bottle). He is now back on Earth, but he is now the mirror ...
user avatar
12 votes
6 answers
1k views

Flipped over through fourth dimension. When do I start to notice biological problems?

In the middle of the night, while J. Random Human is sleeping, A. Hypersphere picks him hyper-up extremely carefully (so that none of his matter falls out in a direction he doesn't have), flips him ...
user avatar
  • 2,379
2 votes
0 answers
157 views

What would conditions be like at the hyperbolic horizon? [closed]

I am imagining a fantasy world where the horizon is a real place. If you travel to where the dome of the sky appears to meet the ground, you can even find intrepid human settlements on the edge of - ...
user avatar
  • 251
15 votes
1 answer
2k views

Aritifical Gravity through Rotating wheel generalisation in a spatial 4th dimension

I'm taking the example of a rotating wheel space station, in which artificial gravity is created through rotation due to the inertia inside. The idea in the 3D environment is that the wheel (2D) is ...
user avatar
5 votes
1 answer
417 views

Using Microscopic Dimensions to Hide Objects

Idea prompted by Brian Greene's The Elegant Universe: String theory postulates microscopic dimensions in space. Could you conceal an object by rotating it into one of the microscopic dimensions and ...
user avatar
  • 527
4 votes
2 answers
315 views

Astronomy in a universe with two "straight" dimensions plus a highly curved dimension

So for lack of a better term (I'm sure there is a better term) imagine a universe without curvature as being like a sheet of paper. You have left, right, forwards, backwards, up, and down. Now take ...
user avatar
  • 877
7 votes
4 answers
1k views

Would an explosion or energy discharge permeate to other spatial dimensions?

Let's assume there are more than 3 spatial dimension, for example 4 (the 4th not beeing time, but spatial) Would a common energy discharge, explosion etc. affect the 4th dimension? I am not sure if ...
user avatar