Unanswered Questions
1,969 questions with no upvoted or accepted answers
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Quantum event horizon?
Is there a limit in an event horizon like there is with a blackhole and similarly with a causal quantum event that limits quantum behavior and segregates it form causal classical behaviour at this ...
CommunityBot
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Matter beyond event horizon
Assuming that antimatter is matter with time arrow reversed, would it be right to say that matter beyond black hole event horizon then would become antimatter because of space and time axes exchanged? ...
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Should any matter form a singularity before crossing the event horizon?
I guess the destiny of any object that falling into a black hole will depend on its size and the density of the black hole it falling in. And from distant observer it should looks different.
A small, ...
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Multidimensional Area and Volume
In 3D the volume is $xyz$, the product of three coordinates. But in $N$ dimension ,how to define area and volume?
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Conformal Transformation: Minkowski sheet to cylinder
What conformal transformation can I make to 2d Minkowski with metric $ds^2=-dt^2+dx^2$ to show that it is conformal to a cylinder?
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Can a black hole move at speed of light?
Black hole comes in all sizes ranging from microscopic black hole on a quantum scale to supermassive black hole that resides in the center of probably every galaxy. Photon have no rest mass hence they ...
rob♦
- 91.5k
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Problem with spin connection term
While working out Kaluza-Klein compactification, I am getting the unwanted spin connection term $\omega_{c}^{ac}$ .I have tried to show that this is zero.But I am not quite sure of it.
What I tried ...
- 207k
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Given the interval values $s^2$ between pairs of events, and given coordinates of these events, how to evaluate the components of the metric tensor?
Considering a suitable set $\mathcal S$ of events in a flat region of spacetime,
given for all pairs of these events the corresponding interval values, $s^2$$ : \mathcal S \times \mathcal S \...
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How do you calculate the time-time component of a tangent vector in spacetime?
The norm of a tangent vector of a spacetime manifold is the sum of the square of its components:$$\lVert \boldsymbol {V_t}\rVert^2=\left(\frac{\partial t}{\partial\tau}\right)^2+\left(\frac{\partial x}...
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Feynman diagram for Hawking radiation?
I'm starting to wrap my head around Feynman diagrams, and the idea of "real" vs. "virtual" particles, but one area where this distinction seems to break down is in describing Hawking radiation, where ...
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Can a charged particle be retrieved from beyond the event horizon?
So I read this question, which is similar, but not the same. My question involves a standard, non-charged, non-rotating Schwartzchild black hole.
If a charged particle, (let's use an electron) passes ...
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On Information-less systems
Is there any system in the universe that is information less, I.e., has or possesses no physical information.
For example if I have a system of particles and if I throw this system into a black hole(...
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Primordial black hole double-slit thought experiment
Imagine the double-slit experiment where the particles emitted were black holes the mass-energy equivalent of sub-atomoic particles. Would they form an interference pattern?
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3
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If all that existed was a supermassive black hole and yourself would you ever have knowledge of its presence, how could you detect it?
So this question is a two-parter.
To elaborate on the first question, let's say you are 10 light-years away from this black hole and it is the mass of the one in the center of our galaxy.
2nd question:...
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What is the covariant derivative of the Ricci Tensor?
How do I take the covariant derivative of the Ricci Tensor? Could someone be so kind as to give me the process of how it is done?
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