Everything posted by Mordred
-
Interpretations of QM
Do what I do ignore interpretations stick to the numbers. Its too easy to for a choice of interpretation to be followed with religious like zeal
-
EPR & SR
I'll have to study the article in greater detail however if you recall above I described how non locality vs local defined in regards to Bell type experiments. You happened to find an article that clearly states that post. "2.5. Dynamical nonlocality and the whole-part dialogue Dynamical nonlocality [37] impacts the dialogue concerning the relationship between parts and wholes. Motivated by the AB non-locality and by weak measurements, we look for new manifestations of the dynamics of QM which are not predicted by the dynamics of classical mechanics. The key difference is that the equation of motion of QM exhibits a new kind of non-locality, which is best described by using modular variables." equations are 2.32 and 2.33 for this examination for the local (classical) vs non local (quantum). As I have time tomorrow will read it in more detail thanks for sharing
-
How does the light from distant stars get to our eyes?
Its amazing at the amount of output a star like our sun emits per second. Our sun outputs roughly \[3.8*10^{26}\] watts per second. 1 watt per second equals 1 joule per second The Earth receives roughly 1400 watts/m^3 of that energy. At peak emission given by wiki the peak wavelength of our sun is approx 883 nm convert to joules per second gives roughly 2.25 *10^{-19} joules . A quick back of envelope calculation gives roughly 10^{46} photons but that's a very rough estimate (granted I also only applied the peak wavelength not the entire ensemble of wavelengths) the total photons radiated is far far higher. So yes a star emits an incredible amount of EM radiation. However I wouldn't advise thinking of light in the fashion of a stream of bullet like photons. Instead your better off understanding light as a superposition of EM waves. Where the sum of energy levels of the waves at a given volume correspond to a probable number density of photons as per Bose Einstein statistics. The photons themselves of that wave do not necessarily have to originate from the star but can be generated on route as well as interfered with on route. The number density will still correspond with the mean energy density or blackbody temperature
- EPR & SR
-
EPR & SR
One of the things about mathematics is the symbology often takes a second place to the relations ( I could literlly hand someone 10 different articles covering precisely the same thing and no two papers apply the same symbology) outside of common standardized forms) However P is simply the entangled particle state with the A and B identifying each particle state whether is spin up, down, left, right, etc. M is simply the probability density matrix of each. with rho \[\rho\] being the density of the operator from that matrix. ie the momentum, position operator. the trace of matrix M can best be covered here https://en.wikipedia.org/wiki/Trace_(linear_algebra) however the above was simply an FYI in so far as one has to take care on how the term local vs non local applies for a given examination the usage can often vary
-
Time and relativity (split from The Nature of Time)
You can't really separate the two gravity is spacetime curvature the time dilation itself results from that curvature where inertial mass and gravitational mass have equivalency ( m_i=m_g). As I mentioned they did test the weak equivalence principle on the moon "Lunar Laser Ranging Tests of the Equivalence Principle with the Earth and Moon" https://arxiv.org/abs/gr-qc/0507083 the strong equivalence principle is also inclusive, however as the test involves laser ranging you are in actuality also testing time dilation via the rate of signals. it might help to further understand that with spacetime curvature you get distortions in light rays from an object. Take two lasers fie them in parallel. If the beams stay parallel you have a flat geometry with no time dilation. If the beams converge you have positive curvature aka gravity with time dilation. So its quite possible to test for time dilation without having to place a clock on the moon. You can literally use lasers or other EM signals.
-
EPR & SR
Thanks there are aspects I like in that model however I will still tend to use QFT over that lol mainly as I'm more familiar with QFT. What appeals to me in the cellular autonoma is that it helps ease numerous calculations to reasonable approximation. This is more an FYI than in regards to the opening post. However as were onto interpretations vs correlation functions. Some of the interpretations I will actually follow without conclusion as to which is the best interpretation are those that apply mathematics with the subsequent tests of those mathematics. This falls into the Bell inequalities as well as CHSH inequalities how CHSH works is in itself a lengthy topic but the essence of it is that it further tests the probability vs the determinable aspects of the various correlation functions via the density matrix that is often employed... without going into the mathematics itself one should be aware that this methodology has some ramifications into the terms locality and non locality. We tend to think this is applying the relativity definition however this isn't necessarily true in the inequality case. The inequality essentially separates the classical probability (local) part vs the quantum interference term (non local). So what are they truly saying here ? Well as I've come to understand it the local in essence means that all the variables to describe a particles evolution is local to the particle state itself. However in the quantum case for example the quantum harmonic oscillator interferes as the quantum harmonic oscillator is part of the field outside the boundary of the well defined particle then then it is non local to the potential boundary we define as the localized excitation. this further ties into the :hidden variable aspects: Is all the information to describe the evolution history of the particle state inclusive in that particle state. (local to the particle state) though hidden. Or non local do we need to further include the field interactions (key note though those field interactions must still follow causality and speed of information exchange. I point this out as it is another commonly used descriptive of local vs non local commonly used in Bells type experiments. a simplified version of the mathematics is as follows. \[P_{all} (+a,+b)=Tr[M_{a}^{+ }\otimes M_{b}^{+ }](\rho_{c}+\rho_{q})\] \[ =(+a,+b)=P_c(+a,+b)+P_q(+a,+b)\] where M is the probability density matrix where the average values of a and b in the classical vs quantum mechanical part is \[\langle ab\rangle=P_c(+a,+b)-P_c(a-,-b)-P_c(a+b)+P_c(-a,-b)=\cos\theta_a\cos\theta_b\] \[\langle ab\rangle=P_q(+a,+b)-P_q(a-,-b)-P_q(a+b)+P_q(-a,-b)=\sin\theta_a \sin\theta_b] sin 2\xi\cos(\phi_a+\phi_b=2\eta)\]
-
EPR & SR
If I recall he applied this to his cellular autonoma model but its been a while since I studied cellular autonoma
-
EPR & SR
I fully agree with the above its literally the same as I have come to understand what is involved in entanglement and the nature of the correlation function Though when you get right down to it QM is entirely probabilistic
-
Time and relativity (split from The Nature of Time)
lol you have no idea how often I have stated this detail.
-
EPR & SR
lmao well if you think about it the Greens correlations is a good example with regards to creation and annihilation operators however I think you should instead refer to this for starters https://en.wikipedia.org/wiki/Correlation_function note the specifications of autocorrelation https://en.wikipedia.org/wiki/Autocorrelation
-
EPR & SR
The correlation function is determined at the preparedness of the entangled states and the experimental apparatus. Before I go further you do know how a correlation function applies is statistical math correct. ? Any two variables can be tested for a correlation those two variables can be 100% unrelated to the other. It could be the number of accidents in Japan vs population growth in the US if one value increases and so does the other then you a positive correlation. If one goes down while the other up then a negative correlation if one value changes while the other randomly goes up and down them no correlation. Regardless of the correlation results no communication hidden variable or cause and effect or in this case shared causality need exist. Here is a simple two possible analogy take a bag of apples and a bag of oranges. You have a statistical chance of getting either oranges or apples. Alice opens her bag she has determined she has apples the probability becomes zero as she determined the physical state (apples) Bob knowing Alice got apples will automatically know he has oranges. The states of what were in the bag were not changed to get the results. The same applies to particle entanglement measuring the (I will stress this the physical state) of one particle does not change the physical state of the other particle) the measurement only affects the probability states. Ignoring the quantum uncertainty when applied to observational interference for the moment
-
Time and relativity (split from The Nature of Time)
Well quite frankly I never liked any metaphysical interpretation but block has always been one I found lacking. Yes there is a fundamental difference on time to space.
-
Time and relativity (split from The Nature of Time)
Yes to all the above I really don't see where your coming from with this. You know as well as I do that temperature for example is part of the EM field a field itself requires space. I really don't see a purpose arguing validity of any form of state that does not involve space. If that state changes you obviously require time. Even if it doesn't can apply duration to that state
-
Time and relativity (split from The Nature of Time)
No I'm not your still applying space via a point in space for temperature that literally equates to my statement on measurement doesn't it? even if you define a space its still involves space. Interesting thought but I rather doubt the conclusion by A. Zee but would have to read the analysis myself to truly understanding where he is coming from.
-
Early Universe Nucleosynthesis
Phase space equations applications to Bolztmann. \[q_i=ap_i\] commoving coordinate of particle as r^i. proper momenta as p_i \[P_i=\frac{m_a dx_i}{\sqrt{-ds^s}=(1-\psi}q_i\] particle density in canonical phase space distribution \[(f^a,P_j,\tau)\] \[dNa=f_a(r_i,P_j \tau)d^3 r_id^3P_j\] for every particle species and their polarizations (a) the energy momentum is given in the Newtonian gauge by the expression (first order) by \[T_{a\nu}^{\mu}=\int d^3 p_i \frac{p^\mu p_\nu}{p^0}f_a\] with \[p^0=-p^0=\sqrt{(q/a)^2+m_a^2}\] \[p^i=p_i=q_i/a\] obeys Boltzmann equation of the form \[\dot{f}+\dot{r}^i\frac{\partial f}{\partial r^i}+\dot{q}\frac{\partial f}{\partial q}+\frac{\partial f}{\partial \tau}_c\] Relativistic Wigner Function Approach to Neutrino Propagation in Matter. https://arxiv.org/pdf/hep-ph/9810347.pdf Signatures of Relativistic Neutrinos in CMB Anisotropy and Matter Clustering https://arxiv.org/pdf/astro-ph/0310198.pdf
-
Time and relativity (split from The Nature of Time)
The question is more fundamental than that. its literally how can anything physically exist without taking up space. Physics describe physical processes and quantities
-
Time and relativity (split from The Nature of Time)
how do you have existence of any form without space?
-
Time and relativity (split from The Nature of Time)
No that's not what I'm stating I simply stated in order to measure something you require space. I did not state change requires measurement how would you ? you would have an effective range of interaction between the two particles ? The better question would be is how you can even have a particle without space for it to reside ? the point like characteristic however miniscule still resides in space.
-
Time and relativity (split from The Nature of Time)
You also require a space to measure A definition I always apply to physical is any measurable property, quantity or state. edit I should add the caveat that a common QFT view is that measurable equates to real as per real vs virtual particles. Though its better described as field perturbations vs excitations.
-
Time and relativity (split from The Nature of Time)
well any waveform changes so obviously you need time. You must have a space to take any measurement or to simply have some quantity to change of what it is to change. If you have absolutely nothing that changes then you certainly cannot apply time. You can simply state time exists for anything that has change.
-
Time and relativity (split from The Nature of Time)
All particles have a range of field influence, Such as the Compton wavelength, harmonic oscillations etc. the point like characteristic is only one characteristic that defines a particle the wavelike characteristics do apply. \[E_{kinetic}\propto T \] the kinetic energy of the particle is proportional to its temperature contribution so it must have space to move correct me if I'm wrong lol how so ?
-
Black Holes are Paradoxical!
I like your approach into the basis of relativity +1
-
Black Holes are Paradoxical!
nope not really mind science has very little to do with physics. In particular it certainly doesn't validate some godly observer view point. We don't count spiritual astral projection like states in physics. Now do we count other mental like powers as being involved
-
Time and relativity (split from The Nature of Time)
without gravity certainly however you can't really have something that changes if that something has no spatial dimension. Can any object or state exist without a spatial dimension of some form. Time isn't an entity unto itself, so under that in order to have time you must something that changes