Physics Forums

Hello, I am reviewing standard literature on the Black Hole Information Paradox and Hawking Radiation (specifically starting from Hawking's 1976 paper and Susskind's Black Hole Complementarity). I have a foundational question regarding how observational limits are formally defined when... Read more

As you can guess im pretty bored! What are some of the most esoteric words you've used in either speech or writing recently? I figure a good deal of you have some pretty hardcore ones what with your technical specializations and all.... As I'm from Denmark I have very few peers I can talk to... Read more

on viewing the paradox through this epistemological lens, and how modern theories frame this distinction between absolute non-existence and unobservable existence. My core argument is that "non-existence" or "nothingness" is not an absolute state, but rather an artifact of human and instrumental... Read more

This is problem 2.7 from Griffiths' Introduction to Elementary Particles. Here are the two reactions that I am trying to examine: (c) ##\Sigma^0\rightarrow\Lambda+\pi^0## (g) ##\Delta^+\rightarrow p+\pi^0## According to Griffiths' solutions, (g) is possible, (c) is not possible due to... Read more

I needed to figure out what the Moore-Penrose inverse is, so I put together these basic notes for myself. Thought I’d share them here in case they’re helpful to anyone else.

The definition of a continuous function at a point ##x_0## is: $$\forall \epsilon >0 \exists \delta >0 \forall x(|x-x_0|<\delta \rightarrow |f(x)-f(x_0)|<\epsilon)$$ What would happen if we change it to another defintion as: ##\exists \epsilon >0 \forall \delta>0 \forall x(|x-x_0|<\delta... Read more

Hello to All,... Biswas et al. recently implemented a HaPPY holographic quantum error-correcting code on the IonQ Forte processor. Within this finite AdS-inspired model, logical bulk qubits were encoded in boundary qubits, an FLM-type entropy relation was reproduced, and non-stabilizer “magic”... Read more

The definition of a continuous function at a point ##x_0## is: $$\forall \epsilon >0 \exists \delta >0 \forall x(|x-x_0|<\delta \rightarrow |f(x)-f(x_0)|<\epsilon)$$ What would happen if we change it to another defintion as: ##\exists \epsilon >0 \forall \delta>0 \forall x(|x-x_0|<\delta... Read more

The definition of a continuous function at a point ##x_0## is: $$\forall \epsilon >0 \exists \delta >0 \forall x(|x-x_0|<\delta \rightarrow |f(x)-f(x_0)|<\epsilon)$$ What would happen if we change it to another defintion as: ##\exists \epsilon >0 \forall \delta>0 \forall x(|x-x_0|<\delta... Read more

Under the Bohmian Interpretation (BM or BMI): Suppose we have a traditional pair of polarization entangled photons A and B going to Alice and Bob, who will test their polarizations in the same reference frame. To be specific, let's say A and B are entangled |HH> + |VV>. In the traditional... Read more

Hello ,I have a situation as shown below were there are 3 differential lines one is a victim and two agressors. I have one agressor is far away then the other agressor . what is the best way to see the crosstalk between the differential ines. buttom line We have digital data which is getting... Read more

Four years ago, the youtube channel The Great War started producing weekly videos detailing the events of World War 1, as they happened, week by week, one-hundred years ago. Since then they've released hundreds of videos, including many about the weapons, equipment, tactics, and... Read more

Could anyone provide a reference to the text where the following theorem appears?

This is problem 2.3 in Griffiths' Introducion to Elementary Particles. I have Griffiths' solutions, otherwise I would be completely lost. Nonetheless, I tried to come up with a solution of my own first. I found only one possibility, which looked ok to me, but it is not even among the 17 ones... Read more

I have a stator from a 1/2 hp, four speed, 3-phase motor. Coming from the stator windings there are 12 wires (two separate sets of six on opposite ends of the motor). Unfortunately these are identified in what appears to be a non-standard numbering system and I have no diagram. One set of wires... Read more

Under the Bohmian Interpretation (BM or BMI): Suppose we have a traditional pair of polarization entangled photons A and B going to Alice and Bob, who will test their polarizations in the same reference frame. To be specific, let's say A and B are entangled |HH> + |VV>. In the traditional... Read more

Suppose two orthogonal neighbouring orbitals ##|\phi _1 \rangle## and ##|\phi _2 \rangle## so that ##\langle \phi_1|\phi _2 \rangle =0##. Applying an electric field adds a new term ##u (c_1^{\dagger}c_1-c_2^{\dagger}c_2)## to the Hamiltonian which u is a constant potential. Obviously, we still... Read more

Noted ebass player Mina has just joined East of Eden. She always was heard playing slap style before. Her finger style play is the greatest say I. How can anyone be so nimble? Note the rust. There is a lot of rust in Japan. I think they like the way it looks. I know I do.

Hello ,given a layout with multilayer traces.On certain trace there is a high distrotion due to cross talk. Is there a strategy to see from where the cross talk is coming from? To color different contributions of the spectrum noise and have indiction the source of it? Is there such a thing? Thanks.

Hello ,given a layout with multilayer traces.On certain trace there is a high distrotion due to cross talk. Is there a strategy to see from where the cross talk is coming from? To color different contributions of the spectrum noise and have indiction the source of it? Is there such a thing? Thanks.