Questions tagged [quantum-mechanics]
The quantum-mechanics tag has no usage guidance.
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Why is there more dark matter than normal matter that makes atoms?
Why does the universe need an excess of dark matter over matter? Is there some conservation law or symmetry that would otherwise be broken if dark matter didn't exist? A neutral hydrogen atom has two ...
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Which wavelength is most likely to be emitted over the lifetime of a black hole by hawking radiation and which is most likely at any given time?
What equations tells us the most likely wavelength emitted for a given black hole mass at any instant in time and over the whole life of the black hole?
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Why does electron degeneracy pressure not stop massive star collapse?
I was thinking a little bit, and never asked myself the following. If white dwarfs do not collapse, because electron degeneracy pressure stops the star from collapsing by its own gravity, and this is ...
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How would white light cavities (WLC) work for gravitational wave detection?
A study done by Michael A. Page, Maxim Goryachev, Haixing Miao, and peers states that WLCs can be used to improve the sensitivity of LIGO. LIGO currently uses photons (for very constant speed at which ...
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When calculating the mass of stars, is it considered that additional mass could be added because of pair-production?
I would like to know that, since stars emit a lot of photons where some of them could be producing electrons-positrons pairs, if its mass affects the calculations, and if because of this is different ...
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Was quantum metrology important for gravitational-wave astronomy?
This article from 2010 titled Quantum metrology for gravitational wave astronomy, 6 years before the announcement of the first direct detection of gravitational waves from a binary black hole merger, ...
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Can Quantum tunneling be possible within Blackhole ? And if so, could that be the source of Dark Energy?
Quantum tunneling starts happening when there are empty energy states available for the electrons to occupy and the energy barrier is of the order of the wavefunction of the electrons.
Could there be ...
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Can somebody explain heisenberg uncertainty principle to 14 year old me? [closed]
I'm a young student that's very curious about physics and especially some physics theories. I've watched a TED video about the Heisenberg uncertainty principle, but I couldn't fully understand it and ...
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Does Hawking Radiation really exist and Why "negative energy" in virtual particles? [duplicate]
I'm doing some research on black holes for a science video contest - more specifically, on Hawking Radiation. As far as I know, there are these constant quantum fluctuations of "virtual" ...
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How spaghettification is possible at the Event Horizon of a supermassive black hole?
if gravity is too strong then it will break a object apart as gravity is strong enough to break the chemical composition of object why we consider "Spaghettification" relevant in this case ?
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What is dark energy made of? [duplicate]
What are the fundamental constituents of Dark Energy?
Can we quantize dark energy in the first place, if it is a kind of Energy?
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How String Theory calculates the Entropy of the Black Hole in a Background dependent way?
How does string theory get an agreement to the Hawking-Bekenstein equations to calculate the quantum entropy of a black hole in a background dependent way?
Is there any sort of area parameter in ...
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How would you define "space" in GR (General Relativity) and in QFT (Quantum Field Theory)?
Is there a univocal definition of space that can be accepted in GR and in QFT?
In GR space is actually "Spacetime", a 4-dimensional entity that includes time. In this case it's impossible to ...
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What is the final destiny of a photon?
What happens with a photon when it moves ouit of a galaxy into the 'infinity void', where there's nothing but 'darkness'? Does the photon decay in the end when there are no interactions?
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Is blue light not traveling faster then red light in space?
I just can't understand why light and other massless particles are not traveling at different speeds?
Gravity effects anything with a mass but light has no mass but a black hole, and weak lensing ...
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Looking for a celestial body that weights ~$10^{17} kg$?
I am exploring the outcome of a problem assigned in a quantum mechanics homework where the mass of of some beam of "something" is insignificant to the result. So much so that something weighing ...
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Why do we use the Planck length?
We are not able to quantize spacetime and the theory of loop quantum gravity has been proved wrong but we still use the Planck length in astrophysics. Why?
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Field excitement in quantum field theory? [closed]
How at the beginning of this universe the fields as proposed in quantum fields theory get excited??
How exactly these fields originated?
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Is a Gravastar with no horizon with ultracompact and extreme density possible?
Is that possible with some strange Quantum Effect could give rise to a completely new kind of a star? Gravastar(Gravitational Vacuum Star) an object hypothesized in astrophysics as an alternative to ...
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Which quantum reality will be seen in a future Earth [closed]
If we orbit near a black hole to travel to future and come back to Earth, which of the quantum realities will be observed in the future Earth?
My question is regarding many worlds interpretation of ...
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Which quantum reality will be seen in a far away galaxy [closed]
I recently watched Brian Greene documentaries on parallel universes and am trying to wrap my brain around multiple quantum universes that form at every event and Einstein's relativity that in space-...
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Contradiction of special theory of relativity and quantum mechanics
Why do special theory of relativty (with the core message of E=mc²) and quantum mechanics do not go together? Why is the special theory of relativity in the quantum model not valid?
Can anyone list ...
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Question about stellar remnants
I know that after a star undergoes the process of mass loss, depending on the mass of the core the stellar remnants gets converted into a white dwarf star, neutron star or a black hole. Hence, if the ...
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Is there a better explanation of Hawking radiation?
I'm writing a piece on Hawking radiation, and find I have something of a problem. The "given" explanation which I find on Wikipedia and elsewhere is unsatisfactory:
"Physical insight into the ...
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is it possible to prove some version of the "cosmic censorship hypothesis" of Roger Penrose which proposes that this is impossible?
Can singularities not hidden behind an event horizon, known as "naked singularities", arise from realistic initial conditions, or is it possible to prove some version of the "cosmic censorship ...
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Are white dwarf stars supported by proton degeneracy as well?
In general, fermions form a degenerate gas under high density or extremely low temperature. It's clear that white dwarf stars are supported by electron degeneracy pressure. However, there are still a ...
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