Space time Definition and 159 Threads

If there were only one rotating massive body and a detector in the universe, would the detector be able to detect that body due to frame dragging, i am imagining the body acting on granular space time akin to a whirlpool, were space time is disturbed in a spiral motion. I am not talking about...

question stated in title. Thanks!

Is space time like a bowling ball on a trampoline or does it surround all matter like water does a submerged object?

How can we define SPACE TIME CURVATURE with respect to dark energy and dark matter ?

So I was thinking about the space time field and trying to wrap my head around how it is actually bent around a mass. Has anyone thought of thinking about the bending of space time around a mass like multiple orbits? Almost like in the way we describe the orbits of an electron around a...

What does spacetime curvature means?

Hi. What is spacetime? Where does it come from? It is a kind of matter, energy ...? Has power? Reacts with something in the neighborhood? How is curving? When the curving with the electromagnetic field why does not respond to his sign? Thank you.

Well when I watch movies I see space time as 2d. But how do we see the space time from Earth to a region lower than earth.

Is there any way of man, in the distant future, bend space time in a way that it would propell something faster than the speed of light and escape a black hole?

Is it true that the speed of light is a conversion factor between time and space? and that D = C*T? and if it is, how does that make any sense?

I am starting to learn Special and General realitivity by reading through Bernard F. Schutz's book "A First Course in General Realitivity". However I can't seem to grasp the relationship between two reference frames as compared with a Space-Time diagram. I understand the geometry of the diagrams...

How does M-Theory deal with space time? One of my friends said something like it verifies it. Is anything known about it?

I want to ask General Relativity is a force or Its a theory which explains how to space-time curve and space-time tells how to move

I was just doing some thinking about the folding of space time. I have seen a demonstration that a piece of paper is folded in two and a hole is poked through the two layers. Are there any negative consequences and if so what are the consequences of folding space time, and what are the...

Hello Everyone. I will be honest with you guys, I dropped out of school at 13 years old and I have no formal qualifications and certainly know very little about Quantum Physics... However I like to "THINK" and this has what has brought me here. What I am about to ask could very easily...

Non-maths general question on history of space time :) Hello, I'm doing a Bsc project on space-time and was hoping to receive some advice on how others would structure the history of the topic. I know this is a broad question but what I'm struggling with is how to narrow down the relevant...

Is it possible to have a space-time with no killing vector? Alternatively, can I define the metric only with the killing vector of the space time?

I hear the term 'space time' thrown around a lot, and I have a basic, and I mean BASIC, understanding of the concept, can someone explain to me space time, its importance to the study of physics and how it relates to E=mc^2.

Is it possible that the metric tensor gmn consist of functions of complex variables? Let say you have a system with stress energy tensor Tmn and consider gmn=V dt2+W dr2. Is it possible that the solution W or V turn out to be a complex function? And how do we interpret this complex metric...

Hello all, My post involves the unexpected continued expansion of the universe. As if matter is being accelerated by some means of unknown repulsion. Let us assume that current space time theory is correct. And that there is a "fabric" of space. We are all familiar with the grid...

Hello. This topic might seem stupid, but i got interested in quantum gravity and I didn't understand how gravity grasps and distorts spacetime. So my question is, how can gravity distort spacetime?

It is said that the space time continuum gives rise to space and time. So, is space time continuum a mixture of space and time or something totally different from space and time? Plz elaborate as per current scientific understanding only. No out and out philosophy please?

Hi when trying to derive this equation, i am stuck on: [\Gamma_{\mu}(x),\gamma^{\nu}(x)]=\frac{\partial \gamma^{\nu}(x)}{\partial x^{\mu}} + \Gamma^{\nu}_{\mu p}\gamma^{p} . This [\Gamma_{\mu}(x) term is the spin connection, if this is an ordinary commutator: a) is it a fermionic so +...

so i am hoping that all of you are familiar with the fact that a basic way of finding the distance between two points in 3d space is a^2+b^2+z^2=c^2. anyway i wanted to know in the equation ds^s=dx^2+dz^2+dy^2-(cdt)^2 does this show the distance between two points in in 3-d space including 1...

I have to compute the square of the Dirac operator, D=γaeμaDμ , in curved space time (DμΨ=∂μΨ+AabμΣab is the covariant derivative of the spinor field and Σab the Lorentz generators involving gamma matrices). Dirac equation for the massless fermion is γaeμaDμΨ=0. In particular I have to show that...

If I take it by literally meaning: Mass causes space time to curve. A rubber sheet where the mass is there, it causes the dent, the curvature. So it means the greater the momentum, the greater the curve or the dent. Now if we have a very big mass, I mean to say big in terms of size, the...

If space is expanding then how did the planets and stars come together to form galaxies? Why are the galaxies themselves not expanding and the solar system not expanding?

Hi all, I am wondering if it is possible to calculate, using Einstein Tensor, the space time curvature around the Earth. As far as I understand, Einstein Field Equations tell us that the presence of a matter curves the space time. So space time curvature is gravity and gravity is space time...

I am glad for a place like this where I can come to discuss what is on my mind with those interested. My delema is expanding my conceptual understanding of relativity and how it realates to space time and gravity. To begin I will go over how I have come to understand space time...

We know that 1. Mass causes bend in space-time and this is the how gravitation occurs. 2. The formula for gravitation (per the universal law of gravitation) is product of masses divided by the square of the distance between them and multiplied by the universal gravitation constant. I...

Why in deriving invariant distance in space time we use Pythagorean Theorem with a negative sign?

Can the amount of space/time warped by a black hole be measured and if so, where can I find measurements of previously measured black holes?

Hi everybody! what happens if an electron passes by with a speed of, say, 99.999999999...% of the speed of light (relative to me). Its mass will then be enormous. Will this electron cause a relevant curvature of spacetime? Can it be so fast that it acts like a black hole? I guess not. But why?

I have read an article that proposes that the space-time frame framework could be supplemented with a momentum -time framework. Link:http://www.newscientist.com/article/mg21128241.700-beyond-spacetime-welcome-to-phase-space.html Quoting from the article, they maintain *When you look...

I was reading a book that discussed a lot about warp drives and warp bubbles and that got me to thinking. I know that energy can warp or bend ST due to Einsteins famous equation but is that true for every kind of energy? could you manipulate ST with a strong enough magnetic field? Is there a...

Okay, so here's my questions: 1. In the theory of the expanding universe, the universe, well, expands. But space it's self would have to expand faster than light could travel or at the same speed for that to work. Umm, Hello? The space would travel faster than light. Would it not? If so...

Why is the Time component in the Space Time Interval negative? The space time interval is defined to be: ds^2=dt^2-dx^2-dy^2-dz^2 or depending on the convention used it may also be: ds^2=-dt+dx^2+dy^2+dz^2 The equation is defining distance using the pythagorean theorem. This results...

This occurred to me when I first heard of the Space Time Frame Drag effect, which was confirmed by the results of Gravity Probe B (GP-B). http://science.nasa.gov/science-news/science-at-nasa/2011/04may_epic/" I am not a scientist or a mathematician, so I turn to my fellow humans who are. Do...

Hi guys I had a question. We know that roles of space and time reverses inside a black hole. In the schwarzchild black hole for example r and t are interchanged into time and space respectively. this argument is used to say that because time moves in a single direction r can only decrease...

Would the effect of photon/quantum wrapping space time be negligible? the photon is small (with rest mass zero, however it does have "mass caused by motion") but so is the space it requires.

The bend in space-time due to Earth's gravity was measured by a gyroscope. A bend in space-time causes even light to bend, how does a gyroscope escape this? The angular momentum being discussed in a gyroscope, is this the same as the one we call "spin" in the entangled photons/electrons?

I'm new, so go easy on me... I see the term spacetime used... does that mean that time exists in the same way that space exists?

Hi, I'm a newbie here, i joined just now purely to ask this question that's been on my mind recently. Now i apologise if this question is fundamentally wrong (which it probably is), but I'm only the average person with an amateur interest in physics :P So don't laugh. Firstly, as you know, we...

space time fabric is not phisical concept, hence we have to ask, how do mass effect at all it? there can not be an interaction between those two

I have two questions about the space-time interval question. I'm doing a little research about space time, and about space time intervals, but I'm not sure which equation to take. Some sources say that its s^2 = x^2 - c^2 t^2, other say its s^2 =c^2 t^2 - x^2. So which one do I take? The...

Hello, Anyone has figure or website which illustrates how foliation of space time hypersurfaces look like or what they meant in the context of the following statement? "We have presented a means of embedding quantum non-locality within a background classical space-time (flat or curved)...

Can someone explain how a curvature in space-time,can cause motion? (Without telling the pillow example) Thanks

Hallo. A question about the relationship between the formulas found using the Lorentz transform and the invariance of the space time interval. Two events A and B occur at the same time and different space locations in system S, where A and B are at rest and at distance x. The system S'...

Hallo I'm new to this (wonderful) forum, and to SR too... I've a general question about the space time interval invariance. Say we have two points A and B, at rest each other, at distance AB. Now A and B simultaneously in their reference frame emit a flash of light. The space time interval...

Is this a possibility?