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Why do the Lagrangians differ by a total time derivative?

classical-mechanics lagrangian-formalism

asked 49 secs ago Andre 1

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Mathematical model for Euclidean space in classical mechanics

special-relativity classical-mechanics metric-tensor inertial-frames galilean-relativity

modified 1 min ago Valter Moretti 48.4k

31

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7

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6k

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Is there a proof from the first principle that the Lagrangian L = T - V?

classical-mechanics lagrangian-formalism

answered 1 min ago Eli 4,481

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143

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Rescaling/renormalisation of the $n$-point function in $\phi^4$-theory by an unique $Z$?

quantum-field-theory renormalization correlation-functions s-matrix-theory

modified 5 mins ago kaylimekay 999

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2

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32

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Can an entangled pair of qubits be created across a distance by using purely classical communication?

quantum-information quantum-entanglement

answered 7 mins ago Norbert Schuch 13.3k

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71

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Is density operator an observable?

quantum-mechanics density-operator observables time-evolution

modified 17 mins ago Michael Riberdy 21

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Energy in ideal gas in isenthalpic process

thermodynamics energy entropy

answered 21 mins ago Bob D 36k

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How does this follow from virial theorem?

thermodynamics classical-mechanics computational-physics molecular-dynamics

asked 24 mins ago Brain Stroke Patient 1,001

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Do pseudovectors also transform differently to vectors under spatial dilation, not just reflections and parity?

general-relativity angular-momentum metric-tensor tensor-calculus

asked 27 mins ago Alex Gower 687

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9

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When is static friction dissipative and when it is non-dissipative?

energy friction rigid-body-dynamics

answered 29 mins ago Bob D 36k

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23

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Is this a correct answer for a thermal expansion problem?

homework-and-exercises thermodynamics

modified 32 mins ago kaylimekay 999

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3

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3k

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Determining flexural modulus by performing 3 point bending test using hollow cylindrical tube

elasticity moment-of-inertia

modified 33 mins ago Community♦ 1

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+250

Why is there a specific negative sign in front of the $m_{12}$ term of the 2HDM Higgs potential?

particle-physics higgs beyond-the-standard-model

modified 35 mins ago Mathieu Krisztian 193

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Can all pseudotensors be expressed as components of higher rank proper tensors?

general-relativity angular-momentum metric-tensor tensor-calculus

asked 38 mins ago Alex Gower 687

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Why do the Lagrangians differ by a total time derivative?

Mathematical model for Euclidean space in classical mechanics

Is there a proof from the first principle that the Lagrangian L = T - V?

Rescaling/renormalisation of the $n$-point function in $\phi^4$-theory by an unique $Z$?

Can an entangled pair of qubits be created across a distance by using purely classical communication?

Is density operator an observable?

Energy in ideal gas in isenthalpic process

How does this follow from virial theorem?

Do pseudovectors also transform differently to vectors under spatial dilation, not just reflections and parity?

When is static friction dissipative and when it is non-dissipative?

Is this a correct answer for a thermal expansion problem?

Determining flexural modulus by performing 3 point bending test using hollow cylindrical tube

Why is there a specific negative sign in front of the $m_{12}$ term of the 2HDM Higgs potential?

Can all pseudotensors be expressed as components of higher rank proper tensors?

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