Recent content by Ennio

not exactly a disturbance from equilibrium but rather the description of the sine wave evolution i nthe two domains.

Greetings, is it possible to characterize a sinusoidal wave in the domain of time and then pass into the domain of movement along x direction? I start with: a is the amplitude of the sine function and ω is the angular velocity. t is the time. I can express the angular velocity in funct. of the...

great answer!

It would be nice if you could share the mathematical procedure to get to the final result. Otherwise, thanks for your partial help.

Hi malawi_glenn. Thank you for your answer. However, what is the exact mathematical expression for the result? From your graph: if the amplitude is zero then the arc length is 3.2?

The known expression of the wave function is where A is the amplitude, k the wave number and ω the angular velocity. The mathematical definition of arc length for a generical function in an interval [a,b] is where, in our sinusoidal case: For our purpose (calculation of the length in one...

I mean that I would like to study a possible difference between cosmic and proper time. Why should time be invariant? Anyway, my question was related to the identification of the emitter in the 4D geometry. Are basically observer and emitter associated to P1 and P2 (see original picture I...

The FLRW metric has been introduced to characterize the homogeneity and isotropy of the Universe and accordingly to obtain "easy" manageable solutions in Friedmann equations. The FLWR metric is where the LHS can be written as where is the proper time (despite we know that time is...

Greetings, how do - the velocity distribution of the solar wind at 1 AU - the velocity distribution of the solar wind in our line of sight look like? I have found the 400 Km/sec but no further information. Is it an average values? Is this radially on the sun the same? Links with graphs are...

Hi @trurle, thank you very much. Do you know how to calculate the solar wind contribution in the line of sight? I have read it is 400Km/sec

Let´s suppose we are observing the sun and measuring some spectral lines. Does the velocity correction´s formula for the Earth include the rotational velocity components of the Sun as well? or rather are we basically measuring both velocity contributes of Earth and of Sun together (receeding...

Here you can find his publication to download. I have bought and read the book: really interesting https://www.scirp.org/journal/PaperInformation.aspx?PaperID=70089

Has anyone read the book of this author? What is your opinion about this topic? https://www.google.de/search?q=tired+light+lyndon+ashmore&source=lnms&tbm=isch&sa=X&ved=0ahUKEwjbo_exj5vfAhXK2qQKHdHsD6AQ_AUIDygC&biw=1280&bih=623

"There is no redshift from the expansion of the universe as that doesn't have an effect within our Galaxy" But we measure the cosmological redshift from Earth and the light, coming from the Background stars, goes through the milky way.. Do we measure higher redshifts along the galactic plane or...