Questions tagged [casimir-effect]

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Could a proton be produced using the dynamical Casimir effect?

According to the standard model, would it be theoretically possible to emit protons or other complex particles from the vacuum using the dynamical Casmir effect? Or is it only possible to emit ...
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How does gravity-spacetime interaction modulate the Casimir force? [closed]

Suppose there is a point source of strong gravity. Far away from this point source in terms of the speed of light, there exists a vacuum in space where no dust is. This vacuum nonetheless can ...
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Casimir Effect Analogue

The Casimir effect from what I understand is computed as the integral over a macroscopic object (e.g. a pair of conducting metal plates) of an essentially quantum phenomenon, namely the energy of the ...
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110 views

Casimir effect evidence

How does the attraction between two metal plates support a new effect (or force)? Isn't it expected that two plates attract each other due to the London dispersion? If so, how does the experiment ...
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117 views

Blocking quantum effects

A Faraday cage blocks electromagnetic fields, provided they are not intense enough to change the state to something non-conductive (e.g. slicing it in two with a laser). Is there any analogous system ...
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Producing negative mass in a realistic way

The Casimir effect produces a region of negative energy between two plates. Is it possible, at least theoretically and ignoring the practical consequences of the enormous force that implies, to ...
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93 views

Can real particles become virtual?

I know that virtual particles can become real for example with the dynamic Casimir Effect. But is the opposite also possible? I.e. can real particles become virtual?
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Does the Casimir effect violate the Generalized Second Law of Thermodynamics?

In order to avoid violation of the Generalized Second Law of Thermodynamics by classical non-minimally coupled scalar fields, Ford et al demonstrated that the quantum inequalities prevent the negative ...
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44 views

Is it possible to produce Fermions from the dynamical Casimir effect?

As I understand it, the dynamical Casimir effect has been demonstrated in the laboratory and has been found to allow the emission of photons from the vacuum. Given the right frequency of the ...
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2answers
175 views

Vacuum energy conversion (to heat)

Two metal plates placed close together in vacuum will collide due to more and more vacuum (electromagnetic) energy being converted from quantum EM modes to kinetic energy of the plates because of the ...
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1answer
105 views

Could the Casimir effect be bad science?

Could the Casimir effect be due to incident light used to observe the effect during the experiments? It seems to me that the effect occurs because of the photoelectric effect because the conditions to ...
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94 views

Casimir Force and bosonic String Theory dimensions

I was reading the lecture notes on Quantum field theory by David Tong. In the section on Casimir force he derived the force of attraction felt by the plates due to the field vacuum energy in $1+1$ ...
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1answer
96 views

Is the Casimir energy in CFT an observable?

We know that if we transform a 2d conformal field theory from a plane to a cylinder with perimeter $L$, the ground state energy will be shifted by $$E = -\frac{c}{24L}$$ due to the Schwarzian ...
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What's the current status of the Casimir force $\leftrightarrow$ vacuum energy controversy?

Most textbooks explain the Casimir force by using the infinitely large ground state energy associated with quantum fields. Since the total energy between two conducting plates is different from the ...
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Could quantum noise do work?

Could quantum noise do work? Could quantum fluctuations do work? Related reference I am asking this question because it seems to me that there are certain Casimir configurations,  like the ...
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An interesting Casimir configuration [duplicate]

A problem related to an interesting Casimir configuration.  I have the following configuration , related to a modified Casimir experiment.  We have two parallel metal plates and an orthogonal ...
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1answer
115 views

Solving a Casimir configuration, the U - bracket

A problem related to an interesting Casimir configuration.  I have the following configuration, related to a modified Casimir experiment.  We have two parallel metal plates and an orthogonal metal ...
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3answers
185 views

Poor man's Alcubierre drive?

In general relativity,  the fundamental notions are the curvature (Ricci tensor) and the stress energy tensor. Energy density and curvature are connected .  The Casimir vacuum between parallel plates ...
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1answer
50 views

Would a planet with mirror surface emit radiation due to dynamical Casimir effect? If so, where the energy would come from?

The dynamical casimir effect tells that an accelerating mirror should produce photons. Due to equivalence principle a mirror in uniform gravitational field also should produce photons. So, should a ...
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2answers
85 views

Do the apparent Black Hole dimensions contract as the observer falls into Black Hole?

According the Special Relativity, all objects contract their length if moving fast. As the observer falls into black hole, his relative speed to it increases up to the speed of light. But from his ...
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1answer
62 views

Casimir Effect for other interactions

I read about the Casimir and dynamical Casimir effect. However it is always mentioned in the context of electromagnetism and with two perfectly conducting plates. My question is whether there can be a ...
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1answer
191 views

Does energy conservation apply to Casimir effect?

If you cancel out some quantum field modes using two 'Casimir' plates you decrease the average energy density in the region and gain potential energy in Casimir force approximately proportional to the ...
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Why Casimir effect moves plates in water?

If two plates are put partly in waving water parallel to each other, there will be less wavelengths between the plates than elsewhere and this will cause the plates to move towards each other. Why do ...
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209 views

What does Pauli-Villars Regularization physically mean?

Calculating loop correlators, Pauli-Villars regularization is introduced to avoid divergence. It is to cut off the high frequency(loop-momentum) contribution. Thus a question naturally arises. Why is ...
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Hawking radiation from black hole inside a Casimir cavity

Would a black hole inside a Casimir cavity emit Hawking radiation more slowly than a black hole outside a Casimir cavity? Various descriptions of each phenomena involve either virtual particles or ...
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164 views

Does light travel faster in between Casimir plates?

Speed of light is in general $c/n$ where $n$ is a refractive index. But for example introducing two parallel plates with very small spatial separation will perturb the energy density of vacuum ...
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1answer
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Casimir Force and Electric Field?

I found the wiki article a bit misleading because I took $<\mathbf{E}>$ as an electric field... the equation in question is $$\frac{F}{A} = -\frac{d}{da} \frac{<\mathbf{E}>}{A} = - \frac{\...
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Vacuum energy length scale detectable by Casimir effect?

According to Sean Carroll's The Cosmological constant (Eqn.20) cosmological observations imply that the magnitude of the vacuum energy density in natural units is given by $$|\rho^{(obs)}_\Lambda|\le (...
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78 views

Casimir effect - gravitational influence?

Regarding the Casimir effect, is gravitational attraction too weak in order to explain the attraction between the plates?
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Casimir effect in the double slit experiment

Has anyone to your knowledge, ever detected, or perhaps just tried to detect, a Casimir effect between the plate (with the slits) and the screen behind in the double slit experiment?
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133 views

Arranging coefficients in a derivation of the Casimir energy

I'm working on the derivation of the Casimir energy from quantum field theory. From the K-G equation (with $c=1$ and $\hbar=1)$ I found the vacuum energy: $$\langle 0|H|0\rangle=E_{vac}=V\int_{-\...
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Casimir effect - constraint of wave length on photons and virtual photons

In Casimir effect, I would like to know, maybe from Quantum Field Theory, why the photons (and virtual photons) have to check the relation $L=n\lambda\,$ with $n>0$ to be considered as present ...
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1answer
151 views

How is Casimir effect related to String theory?

I'm looking at the Casimir effect calculation. As I understand it, it says that because wavelengths can only take on discrete values between two sheets there is a difference in the energy of the ...
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Is zero-point energy real?

In the context of canonical quantization, the ground state/zero-point energy of a harmonic oscillator is $$ E_0 = \frac{1}{2}\hbar \omega. $$ The vacuum is alleged to be permeated with this zero-point ...
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70 views

Dynamical Casimir Effect in expanding space?

The Dynamical Casimir Effect is the production of real photons from the vacuum in a system where one has moving mirrors. The frequency of the photons is related to the ratio of the velocity v of the ...
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How is the dynamic Casimir effect different from normal radiation from accelerating charges?

The Casimir effect involves two parallel conducting plates very close to each other. The static Casimir effect consists in an attractive force between the two plates, explained by the spatial ...
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Calculating the Casimir force in 1+1 dimensions for a real scalar field

Let $\phi(x,t)$ be a real scalar field in 1+1 dimension that lives in an interval $x \in [0,L]$. That is, $\phi(0,t)=\phi(L,t)=0$. Now after some calculations for the vacuum energy and using ...
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Casimir Force between two circular conducting plates

I'd be happy if someone could tell me where to find a derivation (if there is even one) or if there exists an explicit expression that estimates the Casimir force between two parallel circular ...
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1answer
47 views

The Drude model and Casimir force

Some years ago I have read a paper (which I could not find now) where it was argued that using the Drude model to calculate the Casimir force between real metals does not make any sense because the ...
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1answer
170 views

Which fundamental force is responsible for the Casimir effect? [duplicate]

I've read about the Casimir effect, and there seem to be no particle mediating the force; but the virtual particles called virtual photons. Is it enough to conclude that the Casimir effect is due to ...
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1answer
200 views

Virtual and Real particles

In a discussion with my astrophysics lecturer, we ended up talking about virtual particles. One of the most astonishing phenomena he pointed out was the fact that annihilation of virtual particles ...
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Sounds in space, a follow up; the Casimir effect

Sounds in Space, vibration of virtual particles This question is a continuation of this previous question. My question is given two plates located in space is it possible to transmit acoustic ...
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838 views

Is gravity a partial product of the Casimir effect? Thus, is gravity the partial macro effect of electromagnetism/quantum fluctuations?

From the Casimir effect, we know that when two plates are placed very close to each other in a vacuum, they attract each other because the 'pressure' of the quantum fluctuations that press on the two ...
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Why do the energies of the infinite square well decrease as width of the well increases?

The stationary state wavefunctions for the infinite square-well of width $a$ are given by $$\psi_n(x)=\sqrt{\frac{2}{a}}\sin{(\frac{n\pi x}{a})}.$$ These correspond to energies, $$E_n=\frac{n^2\pi^2\...
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Is the fact that the sum of all natural numbers $\sum_{n=1}^\infty n = -\frac{1}{12}$ essential to the understanding of the Casimir Force In QED?

Apparently this result is used in many areas physics including the extra dimensions of string theory, which is not the scope of the question. The result is apparently also used to understand the ...
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Query about approaches to extract energy out of Quantum Vacuum Fluctuations [duplicate]

Are we aware of any theoretically sound approach that would potentially allow us to extract energy out of the Quantum Vacuum Fluctuations indefinitely. The magnitude of the energy extracted doesn't ...
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280 views

Is there any relation between Casimir effect and Unruh radiation?

I hope this question is appropriate for this site. The question refers to the link: https://arxiv.org/abs/1302.2775 where it proposes that: Abstract: The property of inertia has never been fully ...
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107 views

Casimir energy expression for massive scalar field [closed]

While studying the Casimir effect, I had no problem getting the result for the energy of a massive scalar field: $$E(a,m)= -\frac{mc^2}{4} - \frac{\hbar c}{4 \pi a} \int_{2\mu}^{\infty} \frac{\sqrt{y^...
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279 views

A query regarding Casimir Effect

As I understand the Casimir effect is the effect that when two uncharged conducting plates are placed appropriately close to each other, the net pressure b/w the plates due to virtual photons (or ...
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168 views

Casimir force, even dimension

Considering a Scalar field (massless) in a $D$ dimensional space, with Dirichlet boundary condition in $x$ direction, \begin{eqnarray} \phi(0,x_2,x_3,....x_D,t)=\phi(a,x_2,x_3,...x_D,t) \end{eqnarray} ...