370 reputation
18
bio website wildcatsformma.wordpress.com
location Somewhere over the rainbow
age
visits member for 3 years, 10 months
seen Aug 25 at 12:26

My scientific interests:

  • Mathematics: Category Theory, Algebra, Logic (Model-Theory, ATP), Control Systems
  • Physics: General Relativity, QFT
  • Amateur Astronomer and Astrophotographer
  • Mathematica programming

My Websites:

WildCats
Premiere Mathematica package for category theory

xPrint Premiere GUI for tensor input and manipulation

Visit Mathematica.SE!

My non-scientific interests:

  • Skiing, Sailing, Windsurfing
  • Argentine Tango dancer

More or less fluent in (random order):

Italian, English, German, French, Spanish, Dutch and struggling with Russian


Jul
29
comment Is a black hole's mass uniformly distributed?
I do not understand why you keep thinking that objects never pass the horizon. I explained that they do pass the horizon instantaneously, just the images of them approaching the horizon appear to move slower and slower and redder and redder.
Jul
29
comment Is a black hole's mass uniformly distributed?
@Timaeus, oops, of course. Fixed
Jul
29
revised Is a black hole's mass uniformly distributed?
corrected typo
Jul
29
answered Is a black hole's mass uniformly distributed?
Jun
25
comment Will a black hole cause scattering of a gravity wave?
Thank you Acid jazz
Jun
24
comment Will a black hole cause scattering of a gravity wave?
@AcidJazz What textbook is it?
Jun
19
comment A classically charged point particle interacting with electromagnetism and gravity
Hi and welcome to Physics.SE. Where did you find this question?
Jun
13
comment Interpretation for negative energy of curves
where did you find this definition?
Jun
10
answered Stationary v/s Static
Jun
10
comment Stationary v/s Static
Beyond: I can't find any book by Blau online. There are lecture notes though. I strongly encourage you to precisely cite and link any mentioned work, so other users can easily find it.
May
10
comment Is there a quark conservation law?
@JohnDuffield your answer is just silly, as physicus pointed out. Charge (which - hopefully - you agree is conserved under all interactions) also annihilates (or simply neutralizes). You start with a positive and a negative charge (electron and positron for ex.). Bring them together and you get annihilation (gamma rays). Zero net charge at the end and zero net charge at the beginning. Charge conservation. Same thing with quarks...except when there are weak interactions involved.
May
9
comment Free-falling from rest into a Kerr black hole
John , why don't you simply show us the eqs you have made and we start talking from there? This is not a philosophy Q&A place.
May
9
comment One-body General Relativity
"so a universe with only one body cannot exist" Perhaps it does exist,but unless that body is YOU,you would never know. I think you are wasting your time in meaningless thoughts. Every physics theory starts by studying a single source in isolation.Obviously this is an idealized model of a real source sufficiently distant/isolated from anything else. Continues....
May
9
comment Questions about MTW's “thousand” tests of the Einstein principle
@user12262 Free fall is defined and explained in paragraph 1.3 pag. 13
May
3
answered In general relativity, how do we think of Newton's third law for gravity?
May
2
answered Any tips on evaluating Riemann tensor?
Mar
30
comment Is there a default notation for 4-vectors while handwriting?
As you proceed with MTW the "boldness" decreases. The large majority of eqs are written in index notation, for the simple reason that it is the most precise one. There is a paragraph somewhere explaining the advantages and pitfalls of different notations. For serious work the index notation is unavoidable, except when working with forms only. So just be patient and keep on reading.
Mar
27
comment Is a nuclear bomb in some sense a bullet travelling at the speed of light, but along time rather than along space?
nice picture. Self produced, or....?
Mar
11
comment Is the universe 5 dimensional space-time or 4?
thank you for accepting my answer. I have added 2 long paragraphs. If you like my answer, you may also upvote it.
Mar
11
revised Is the universe 5 dimensional space-time or 4?
added last 2 paragraphs