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Is Schrodinger's Cat itself an observer?
12 votes

To build upon Bruce's answer, what happens according to Schrödinger's equation is the following: The initial quantum state of the system (after putting the cat in the box) is $$|\text{cat alive}⟩ |\...

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Can an electron and a proton be artificially or naturally merged to form a neutron?
6 votes

To answer the question of whether this occurs naturally: Yes. This is what happens with neutron degeneracy in neutron stars: Neutron degeneracy is analogous to electron degeneracy and is demonstrated ...

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Is Electric Potential real?
Accepted answer
3 votes

You're probably thinking of the Aharonov–Bohm effect. Quoting from the article: The Aharonov–Bohm effect, sometimes called the Ehrenberg–Siday–Aharonov–Bohm effect, is a quantum mechanical phenomenon ...

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Is direction of angular velocity just a definition or has a physical significance?
2 votes

Since the question mentioned higher-dimensional space, I wanted to give an answer that works in any-dimensional space, not just 3. I'll start with formal, mathematical definitions and then connect ...

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How does a spectrum analyzer works. Example with particular case: eyes
2 votes

See the question Which transform most closely mimics the human auditory system? on the Signal Processing SE. In short, the ear has a filter bank of gammatone-like filters tuned to different ...

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Why use a particular regularization for $\int_0^\infty \mathrm{d}x\,e^{i p x}$?
2 votes

Something that fixes $\frac{i}{p}$ uniquely is that, independently of regulator, it is the constant term of the asymptotic expansion of $$\int_0^b \mathrm{e}^{ipx} \,\mathrm{d}x = \frac{i - \mathrm{e}^...

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Simplest possible thought experiment that illustrates the difference between the past and the future?
Accepted answer
1 votes

I suggest a pragmatic interpretation of the question: Design an experiment E such that a discriminator D (such as an individual or team of scientists) can determine whether a recording R of E is being ...

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Is it worth reading The Elegant Universe?
Accepted answer
1 votes

As a matter of opinion, I would say: absolutely. In fact, The Elegant Universe was one of the books that really got me interested in theoretical physics. It uses examples that are easy for the layman ...

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Are there 4D spacetime not described by GR?
0 votes

No. Nordström's theory of gravity was an early competitor to GR and is an equally self-consistent theory in 4 dimensions. According to Nordstrom's scalar theory of gravity and the equivalence ...

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If spacetime is curved, how would anyone know? If anyone could tell, would that really be spacetime curving?
0 votes

Then suddenly, some incredibly huge cosmic event happens, and unthinkably large gravitational waves pass through the area... But if space itself is changing, how would they know? Richard Feynman's ...

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Wormholes, time travel, and time dilation
0 votes

Wormholes, time machines, and the weak energy condition by Morris, Thorne, and Yurtsever contains the following description and illustration: Figure 2 is a spacetime diagram for the conversion of a ...

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