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Safinaz's latest activity
Safinaz
posted the thread
A
A question from a paper on perturbation theory
in
Cosmology
.
Where ##\delta \phi## is the first-order perturbation of a scalar field, ##\Phi## is the first-order perturbation of the space-time...
Mar 20, 2024
Safinaz
reacted to
renormalize's post
in the thread
Simpliying this partial differential equation
with
Like
.
OK, thanks for clearing things up! So we have:$$\left(x+y\right)\delta_{ij}+\frac{\partial^{2}x}{\partial w^{i}\partial...
Mar 10, 2024
Safinaz
replied to the thread
Simpliying this partial differential equation
.
Thanks so much for the answer : )
Mar 10, 2024
Safinaz
replied to the thread
Simpliying this partial differential equation
.
Hi, thanks for reply. What range does the index ##i## run over: ##\left( 1,2,3\right)## or ##\left( 0,1,2,3\right)## or something...
Mar 9, 2024
Safinaz
posted the thread
Simpliying this partial differential equation
in
Calculus and Beyond Homework Help
.
Does this equation mean that: ## x+y =z ##, and ## x = y##? I mean ## \delta_{ij} ## terms in the LHS of the eqaution equal those at...
Mar 9, 2024
Safinaz
replied to the thread
I
Partial derivative is terms of Kronecker delta and the Laplacian operator
.
So there is no any way to simplify ## \partial_i \partial_j \phi ## ?
Mar 4, 2024
Safinaz
posted the thread
I
Partial derivative is terms of Kronecker delta and the Laplacian operator
in
High Energy, Nuclear, Particle Physics
.
How can the following term: ## T_{ij} = \partial_i \partial_j \phi ## to be written in terms of Kronecker delta and the Laplacian...
Mar 4, 2024
Safinaz
reacted to
PeroK's post
in the thread
How to write this expression in terms of a Hyperbolic function?
with
Like
.
It's fairly obvious. I thought the question was to relate that to ##\cosh x##, which I don't think can be simply done.
Feb 12, 2024
Safinaz
replied to the thread
How to write this expression in terms of a Hyperbolic function?
.
So can it written as: ## Eq = e^{ -ht} ( e^{t\sqrt{x}} + e^{-t\sqrt{x}} ) = 2 e^{ -ht} Cosh ( t \sqrt{x}) ##?
Feb 12, 2024
Safinaz
posted the thread
How to write this expression in terms of a Hyperbolic function?
in
Introductory Physics Homework Help
.
The eqution can be written as: ## Eq= e^{t( -h + \sqrt{ x} )} + e^{t( -h -\sqrt{ x} )} ## Can this be written in terms of Cosh x ?
Feb 12, 2024
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