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1d
revised Mass spectrum of field theory
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1d
revised Pauli matrices and $SU(4)$
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1d
revised Exactly how much lift is needed to overcome the weight of an average person?
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1d
comment Derivation of Euler-Lagrange equation from principle of least action
Comment to the question (v2): It seems that OP is asking for the standard integration-by-parts argument in calculus of variations that leads to Euler-Lagrange equations. This is shown in many textbooks on the subject (including the above two Wikipedia links $\uparrow$), and e.g. this Phys.SE post and links therein.
1d
revised Derivation of Euler-Lagrange equation from principle of least action
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1d
comment How to find the rank of the matrix $\frac{\partial ^2\mathcal{L}}{\partial \dot{X^\mu} \partial \dot{X^\nu} }$ for the Nambu-Goto string Lagrangian?
Observation: It is tempting to alternatively define $\quad \chi_1 := \frac{1}{2}P^2$, $\quad \chi_0 := P\cdot X^{\prime}$, $\quad \chi_{-1} := \frac{1}{2}(X^{\prime})^2$, and $\quad \chi_{\pm 2} := 0$. Then the PB algebra almost reads $\quad \{\chi_{\alpha}(\sigma),\chi_{\beta}(\sigma^{\prime})\}_{PB} = \left[ \chi_{\alpha+\beta}(\sigma)+\chi_{\alpha+\beta}(\sigma^{\prime})\right] \delta^{\prime}(\sigma-\sigma^{\prime})$ except for one sector, which is $\{\chi_{-1}(\sigma),\chi_1(\sigma^{\prime})\}_{PB} = X^{\prime}(\sigma) \cdot P(\sigma^{\prime}) ~\delta^{\prime}(\sigma-\sigma^{\prime})$;
1d
revised Simple harmonic motion angular frequency
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1d
revised Diagonalisation: Schmidt vs eigenvalue - when to use which?
Please dont introduce new tags unless necessary
1d
revised How would one attach black hole to starship in the Black hole Starship model?
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1d
comment Rotation of Spacetime $\Rightarrow$ Change in orbit/path
Comment to the post (v2): Perhaps OP is asking if the spin of a lone black hole leads to a Magnus effect or curveball, so to speak? If that's the question then the answer is no.
1d
revised On a AC to DC adapter there are +12v wire with 24A and -12v have 0.5A. How many amp this adapter will provide in total?
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1d
revised Intuitive understanding of vector spaces
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1d
reviewed Leave Closed When light reflects from a medium of lower index of reflection to a medium of higher index of refraction, why does the light undergo a phase shift?
1d
revised When light reflects from a medium of lower index of reflection to a medium of higher index of refraction, why does the light undergo a phase shift?
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1d
revised Question about the apparent loophole in principle of least action
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1d
answered Question about the apparent loophole in principle of least action
1d
revised Question about the apparent loophole in principle of least action
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1d
revised Scale invariance and stress energy tensor
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1d
revised What are the calculations specifically needed for High Altitude Ballooning?
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1d
revised Difference between stiffness and damping?
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