All Questions
Tagged with particle-physics general-relativity
12
questions with no upvoted or accepted answers
2
votes
0
answers
100
views
Can squeezed vacuum reduce the mass of a black hole?
Could the negative energy density parts of squeezed light really reduce the mass of a black hole, as stated here (“A pulse of negative energy injected into a charged black hole might momentarily ...
- 135
2
votes
0
answers
60
views
Evolving energy density of a particle species in cosmology
Suppose you have a momentum distribution of some decoupled $X$ particles in the early universe $f(\mathbf{p})$ that is injected in (well above the electroweak scale so that degrees of freedom for all ...
- 499
2
votes
0
answers
180
views
Spin particles in curved spacetime
On the Lorentz space, particles are axiomatized as unitary projective representations of the Poincaré group (according to Wigner if I recall correctly). It is then possible to specify a (non-charged) ...
- 41
2
votes
0
answers
131
views
Elementary particle (electron) and non-elementary (proton) spagettification
I understand that spagettification means the vertical stretching and horizontal compression of objects into long thin shapes in a non-homogenous gravitational field, it is caused by tidal forces.
Now ...
- 29k
2
votes
0
answers
77
views
does an accelerated charge would be slower relative to an neutral particle due to radiating and lose energy ? both in free fall
this part from this article https://en.wikipedia.org/wiki/Paradox_of_a_charge_in_a_gravitational_field
"Putting together these two basic facts of general relativity and electrodynamics, we seem to ...
1
vote
0
answers
58
views
Black $p$-brane solution
Im trying to confirm that the metric (11) in the paper below is a solution to Einstein's equations (6). I tried to use the metric and extract $\lambda=(1-(r_+/r)^{D-3})^{1/2-\gamma/2(D-3)}$ and $R=r(1-...
- 63
1
vote
0
answers
53
views
Is there an upper boundary to magnetism?
This is gonna take some explaining, and full disclosure: I'm still undergrad, so please, forgive my ignorance here. Though please also hear me out: magnetism, like gravity, falls off with distance, ...
- 111
1
vote
0
answers
62
views
Lagrangian of free particle relativistic case
Why must the covariant Lagrangian of a free particle be a first-order differential?
1
vote
1
answer
103
views
Apparent analogies between statements from linear algebra and covariant tensor calculus
When using covariant tensors in relativity or particle physics, there are some statements that seem like analogues of statements known from linear algebra. For example, if we have a symmetric real-...
- 121
1
vote
0
answers
153
views
Mass is rigidity?
In General Relativity, a totally rigid body cannot be accelerated. It will behave like something of infinite mass.
Similarly a body of two separated particles which connected to each other with a ...
- 11.2k
0
votes
1
answer
78
views
Moving particle with GR not taken into account vs GR taken into account
If we imagine a lightwave moving through space without considering how the space is deformed due to the energy and momentum of the light, we would find it redshifted once we take GR into account ...
- 631
0
votes
1
answer
49
views
On two different size planets occurs radioactive decay, is the amount of decay the same?
Imagine there is a planet as big as our sun and a earth like planet. On both planets is a box with equal amounts of radioactive polonium. In between the planets is a measure station. After 10 years ...
- 3,348