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I'm a theoretical physicist.


10h
comment An inconsistency in Hamiltonian formulation for non-local Lagrangian: what am I doing wrong?
E.g. because Def. (D) is compatible with the usual local case.
11h
comment An inconsistency in Hamiltonian formulation for non-local Lagrangian: what am I doing wrong?
The chosen sign convention is to get the Lagrangian eq. of motion (C).
13h
comment When the Cosmic Microwave Background radiation cools, where does the energy go?
Possible duplicates: physics.stackexchange.com/q/7060/2451 and links therein.
1d
comment Chi Square Minimization
Would Cross Validated be a better home for this question?
1d
comment Translation of the Mechanique analytique
This question (v3) asking for free versions of specific material seems to be off-topic.
1d
comment SR: vector field and change of reference
Comment to the question (v2): The indices on lhs and rhs do not match.
1d
comment Chern Simons theory
Related question by OP: physics.stackexchange.com/q/172886/2451
1d
comment Legendre transform for non-local Lagrangians, or Hamiltonian of non-local Lagrangian and their properties
Eq. (4) is in principle valid for general non-local $S[q,v]$. For specific application (such as e.g. Gurtin-Tonti bi-local convolution theory, cf. this Phys.SE post), it might be convenient to rename/relabel/reflect certain variables, but this is effectively just a notational issue.
2d
comment Antimatter universe and Noether's theorem
Related: physics.stackexchange.com/q/8518/2451
2d
comment Legendre transform for non-local Lagrangians, or Hamiltonian of non-local Lagrangian and their properties
I updated the answer.
2d
comment A reference frame is any coordinate system or just a set of Cartesian axes?
Possible duplicates: physics.stackexchange.com/q/12221/2451 and links therein.
2d
comment Since Earth spins, would an aircraft travelling opposite to direction of Earth spin take less time?
Possible duplicates: physics.stackexchange.com/q/16390/2451 and links therein.
2d
comment Starter's book on Quantum Mechanics (more general and simple books than full QM textbooks)
Hi Landos Adam. Resource recommendation and reference questions are restricted on Phys.SE for various reasons, e.g., they tend to be list questions and primarily opinion-based. I'm closing this question as a duplicate, not because it is an exact duplicate, but to point you in the right direction.
2d
comment Starter's book on Quantum Mechanics (more general and simple books than full QM textbooks)
Related: physics.stackexchange.com/q/33215/2451
2d
comment Do photons lose energy due to gravitational redshift? If so, where does the lost energy go?
Possible duplicates: physics.stackexchange.com/q/7060/2451 and links therein.
2d
comment Red shifted photons lost energy in which form?
Possible duplicates: physics.stackexchange.com/q/4821/2451 , physics.stackexchange.com/q/7060/2451 and links therein.
2d
comment Redshifted Photon Energy
Related: physics.stackexchange.com/q/7060/2451 and links therein.
2d
comment What does the “T” stand for in T-duality?
Related meta post: meta.physics.stackexchange.com/q/1083/2451
2d
comment Metric in Lagrangian and the minimum total potential energy principle
The Lagrangian (1) is a special case of a NLSM.
2d
comment Metric in Lagrangian and the minimum total potential energy principle
$\uparrow$ Which notes? Which page?