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Let's say we have two point charges q1 and q2 both of which are positive, according to Newton's third law the force one exerts on the othe is equal to...
Asked on 11/23/2020 by Sasha1296
2 answerThis might be a stupid question. In Bailin and Love's "Cosmology in gauge field theory and string theory", the authors are describing how to calculate the effective potential at...
Asked on 11/23/2020 by Sayan Mandal
2 answerIs the resistivity of all (conducting) alloys more than that of all (conducting) metals?I have read it in some places but then I thought of solder....
Asked on 11/22/2020 by Kalpit Vishnoi
1 answerConsider the Schwarzschild metric $$ds^2 = -f(r)dt^2 + frac{1}{f(r)}dr^2+r^2 dOmega^2,$$ where $f(r)=1-frac{2M}{r}$. I take it that $M$, although not really the mass of a black hole, is...
Asked on 11/22/2020 by jboy
2 answerIn many places and tutorials, gravity is often considered as a negative vector. I am confused as to why is that? I though I was missing something from trigonometry but...
Asked on 11/22/2020 by Grzegorz Krug
4 answerI think my question breaks down into two parts. Let's say you have a two qubit system and you can perform projective measurements. Each round of measurements will consist of...
Asked on 11/22/2020 by Blackwidow
2 answerIt can be assumed I have taken introductory courses of GR (Carroll) and QFT(Schwartz). I skimmed through this book by Marcolli on Seiberg-Witten (SW)...
Asked on 11/22/2020 by aitfel
1 answerWhy is it said that electric current always flows from higher potential to lower potential? It's said that current flows from a positive terminal to a negative terminal, but I've...
Asked on 11/21/2020 by aymusbond
1 answerI will first explain how I interpret the vector addition of velocities. Let's assume that a particle moves with a velocity of $x$ horizontally and simultaneously also moves with...
Asked on 11/21/2020 by Rajdeep Sindhu
5 answerI am studying this paper: Gravitational radiation from a particle infalling radially into a Schwarzschild black hole by Davis et al. It deals with the calculation of...
Asked on 11/21/2020 by mattiav27
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