Questions tagged [spacetime-dimensions]

For questions concerning dimensions of space and time, whether our 3-space + 1-time or other dimensions.

Filter by
Sorted by
Tagged with
4 votes
3 answers
357 views

Could three-dimensional beings engineer a multi-dimensional structure?

Consider the bigger-on-the-inside concept of sci-fi staples like the TARDIS from Doctor Who. A generally accepted explanation for how a space’s interior could be larger than its exterior shape and “...
inkwell87's user avatar
  • 889
10 votes
8 answers
4k views

This teleporter causes gravitational warping of the user’s body—how come it doesn’t kill them?

So I’ve got a nice point-A-to-point-B teleporter machine, and for some extra flavor I’d like to have the experience of using it include a healthy dose of gravitational/physical warping to push, pull, ...
amphibiaenjoyer's user avatar
5 votes
2 answers
176 views

Light effects when facing a wormhole with faster time flow on the other side

Simply put, let's say there is a portal that leads to the past, and that it's "catching up" : an observator from the present looking into the past sees time go faster, and an observator in ...
Gouvernathor's user avatar
1 vote
3 answers
204 views

Would lenses work in a universe with four spatial dimensions?

Let us assume that we have a universe with four spatial dimensions rather than the three of our universe, in which matter can exist that is a four-dimensional analogue of three-dimensional matter. ...
Monty Wild's user avatar
  • 55.9k
2 votes
3 answers
225 views

In a universe with loop dimensions how is the density of a massive body calculated? [closed]

In ordinary 3D space one can calculate the density (average density) of a massive body by dividing the mass of that body by the volume it inhabits D = M/V with M in say kg and V in say m^3 so D = [kg/...
Darren Nicholls's user avatar
44 votes
14 answers
5k views

How can I make the rules of my Faerie Portal free from contradiction?

On the hilltop in the field near my house, there lives a coven of witches. Or, more accurately, there is a coven of witches living in a pocket of the Faerie Realm which has recently become attached to ...
Daron's user avatar
  • 65.6k
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 ...
Fawaz Al Lawz's user avatar
1 vote
2 answers
166 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 ...
Max's user avatar
  • 61
8 votes
10 answers
2k views

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 ...
amphibiaenjoyer's user avatar
0 votes
1 answer
176 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 ...
Blue Skin and Glowing Red Eyes's user avatar
4 votes
2 answers
195 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/...
Nervous Cat's user avatar
7 votes
3 answers
312 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 ...
Zanly's user avatar
  • 119
27 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 ...
user avatar
8 votes
4 answers
243 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 ...
KeizerHarm's user avatar
  • 14.3k
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 ...
Logan R. Kearsley's user avatar
17 votes
12 answers
4k views

How is it possible that some extra-dimensional pouches can store living things while others can't? [closed]

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 ...
user6760's user avatar
  • 46.5k
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 ...
HomegrownPotatoes's user avatar
4 votes
7 answers
566 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 votes
2 answers
203 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 ...
Luke Duffy's 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 ...
user6760's user avatar
  • 46.5k
3 votes
2 answers
172 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 ...
Incognito's user avatar
  • 38.5k
2 votes
5 answers
134 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 ...
Jay Dee's user avatar
  • 492
6 votes
3 answers
155 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 ...
Niko Greenwood's user avatar
2 votes
1 answer
217 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 ...
EricNie's user avatar
  • 31
5 votes
3 answers
992 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 ...
4.12.22.4.18.0.'s user avatar
1 vote
5 answers
629 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
9 votes
2 answers
425 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 ...
Kristian Berry's user avatar
3 votes
1 answer
204 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 ...
Nervous Cat's user avatar
7 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 ...
user6760's user avatar
  • 46.5k
6 votes
4 answers
253 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,...
L.Dutch's user avatar
  • 276k
1 vote
3 answers
151 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?) ...
MajorTom's user avatar
  • 1,466
2 votes
2 answers
161 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 ...
Hannah's user avatar
  • 21
4 votes
3 answers
197 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 ...
Dejah Williams's user avatar
-3 votes
2 answers
965 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 ...
CYCLOPSCORE's user avatar
  • 2,913
3 votes
4 answers
201 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 ...
Anders Gustafson's user avatar
11 votes
9 answers
7k 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 ...
CYCLOPSCORE's user avatar
  • 2,913
0 votes
1 answer
207 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 ...
CYCLOPSCORE's user avatar
  • 2,913
2 votes
2 answers
165 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 ...
Ichthys King's user avatar
  • 15.6k
10 votes
5 answers
654 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 ...
DWKraus's user avatar
  • 63.2k
3 votes
2 answers
242 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
205 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 ...
Jesse Tate's user avatar
2 votes
1 answer
169 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 ...
Jesse Tate's user avatar
3 votes
6 answers
2k 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 ...
zomega's user avatar
  • 133
5 votes
9 answers
521 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 ...
Shalon Sims's user avatar
1 vote
1 answer
189 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 ...
Vivi's user avatar
  • 19
4 votes
5 answers
5k 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 ...
Nico A's user avatar
  • 149
45 votes
13 answers
13k 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 ...
Logan R. Kearsley's user avatar
8 votes
1 answer
389 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 is one, in which the minus sign in the space time interval is replaced with a plus sign. So this universe has four fundamentally similar dimensions ...
Anders Gustafson's user avatar
9 votes
5 answers
444 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 ...
Logan R. Kearsley's user avatar
15 votes
4 answers
1k 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 ...
Logan R. Kearsley's user avatar