Physics Questions, Problems & Solutions : TransWikia.com ~ Page 655

Usefulness of $| {rm in}rangle$ and $| {rm out}rangle$ states in S-matrix description of QFT

I am currently reading Niklas Beisert's lecture notes on QFT, Chapter 10, on the scattering matrix $S$.$^1$ My main confusion lies in the construction of...

Asked on 01/14/2021 by Sito

2 answer

How can sine waves represent both AC and sound waves?

How can sine waves be used to describe both alternating current and sound waves? In the case of alternating current, the zero crossing represents zero current, and the waveform...

Asked on 01/14/2021 by user164656

2 answer

Power absorbed by an object inside a perfect blackbody cavity

Suppose you were inside a thick spherical shell of inner radius $R$, which was a perfect black body at some temperature T. What would be the power a sphere of...

Asked on 01/13/2021 by Novice C

2 answer

Free path length of microscopic black holes through degenerate matter

How would one approach calculating free path length of a microscopic black hole through degenerate matter? I wondered about how the interaction of a microscopic black hole with a neutron...

Asked on 01/13/2021 by datenwolf

0 answer

Proportionality in RC circuits

I know that the time constant $tau= RC$, where $R$ is the resistance and $C$ is the capacitance.But I'm confused, bear with me, when I double...

Asked on 01/13/2021 by PeaceSeeker127eq

2 answer

What does quantum gravity look like at or beyond the Planck scale?

I am reading an article called The fundamental nature of space and time by Gerard 't Hooft. On page 3 he writes the following:Physically, however, the perturbative approach fails. The...

Asked on 01/13/2021

1 answer

What will be the direction of the force required on the ball to move the ball up the stairs?

Is this diagram correct?The point of force A is at the farthest distance from the fixed centre O ,so the moment arm CD is greater and therefore,maximum torque would...

Asked on 01/13/2021 by user3244786

1 answer

Relation between canonical forms and volume of polytopes

Références: Ref $1$: Henriette Elvang, Yu-tin Huang: Scattering Amplitudes Ref $2$: Jaroslav Trnka: The Amplituhedron [For simplicity, the notations of the $2$ refs have...

Asked on 01/13/2021 by Trimok

1 answer

polarized trace

Lets say I want to calculate the following Trace $mathrm{Tr}[u^{s_1}(p)~bar{u}^{s_2}(p)~gamma^{mu}not p~ not q~ not p~ gamma^nu]$ Now if I consider unpolaized case then $s_1=s_2=s$ and I simply sum over s,...

Asked on 01/13/2021 by Hubble07

1 answer

How to couple the $^3p_2$ with $d_{5/2}$?

The first two electrons' LS term is $^3p_2$,how can this term coupling with another electron $d_{5/2}$?(this electron in another shell) for $^3p_2$,$L_{12}=1$,$S_{12}=1$,and only the orientation...

Asked on 01/13/2021 by D.P

0 answer

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