Serving the Quantitative Finance Community

 
User avatar
katastrofa
Posts: 10082
Joined: August 16th, 2007, 5:36 am
Location: Alpha Centauri

Re: Physicists, Stop the Churlishness

June 2nd, 2020, 11:39 pm

And what do you benefit if you gain the whole world but lose your own soul?
You can never lose Soul

www.youtube.com/watch?v=efctwrcovJQ
There's some risk that you'll gain one, though!
 
User avatar
Cuchulainn
Topic Author
Posts: 64439
Joined: July 16th, 2004, 7:38 am
Location: Drosophila melanogaster
Contact:

Re: Physicists, Stop the Churlishness

June 21st, 2020, 1:04 pm

I have the best goddam COVID-19 modelling, forecasting and policy tool on Planet Earth. I did it on my little lonesome with a pencil and paper and (God forbid) Excel. It beats any other model out there bar none.

Physicist or mathematician?
"Compatibility means deliberately repeating other people's mistakes."
David Wheeler

http://www.datasimfinancial.com
http://www.datasim.nl
 
User avatar
katastrofa
Posts: 10082
Joined: August 16th, 2007, 5:36 am
Location: Alpha Centauri

Re: Physicists, Stop the Churlishness

June 22nd, 2020, 1:41 am

Mathematician (possibly an armchair physicist on Sundays), Kurt Vonnegut reader.
 
User avatar
Cuchulainn
Topic Author
Posts: 64439
Joined: July 16th, 2004, 7:38 am
Location: Drosophila melanogaster
Contact:

Re: Physicists, Stop the Churlishness

June 22nd, 2020, 8:55 am

Mathematician (possibly an armchair physicist on Sundays), Kurt Vonnegut reader.
Between a rock and a hard place.

Looking on as a disinterested observer in this model pandemic, I notice

1. Scientists apply their past experience to current situation.
2. As time goes on, the more 'embedded' they become (tunnel vision).

Or so it seems. It's a kind of Sapir-Whorfe phenomenon.
"Compatibility means deliberately repeating other people's mistakes."
David Wheeler

http://www.datasimfinancial.com
http://www.datasim.nl
 
User avatar
katastrofa
Posts: 10082
Joined: August 16th, 2007, 5:36 am
Location: Alpha Centauri

Re: Physicists, Stop the Churlishness

June 22nd, 2020, 12:12 pm

OK, then it's a physicist and an armchair mathematician on Sundays. A man, no doubts.
 
User avatar
Cuchulainn
Topic Author
Posts: 64439
Joined: July 16th, 2004, 7:38 am
Location: Drosophila melanogaster
Contact:

Re: Physicists, Stop the Churlishness

July 25th, 2020, 9:47 am

Body language...

Image
"Compatibility means deliberately repeating other people's mistakes."
David Wheeler

http://www.datasimfinancial.com
http://www.datasim.nl
 
User avatar
katastrofa
Posts: 10082
Joined: August 16th, 2007, 5:36 am
Location: Alpha Centauri

Re: Physicists, Stop the Churlishness

August 3rd, 2020, 12:29 am

Body language...

Image
listening Van Morisson?
 
User avatar
Cuchulainn
Topic Author
Posts: 64439
Joined: July 16th, 2004, 7:38 am
Location: Drosophila melanogaster
Contact:

Re: Physicists, Stop the Churlishness

August 3rd, 2020, 6:35 pm

Body language...

Image
listening Van Morisson?
wouldn't it be great if it was like this all the time?

www.youtube.com/watch?v=JMQW_ffGHnk
"Compatibility means deliberately repeating other people's mistakes."
David Wheeler

http://www.datasimfinancial.com
http://www.datasim.nl
 
User avatar
Cuchulainn
Topic Author
Posts: 64439
Joined: July 16th, 2004, 7:38 am
Location: Drosophila melanogaster
Contact:

Re: Physicists, Stop the Churlishness

August 25th, 2020, 8:35 am

Of course, but this isn't a SDE/PDE thing, just look at the physics.
"Compatibility means deliberately repeating other people's mistakes."
David Wheeler

http://www.datasimfinancial.com
http://www.datasim.nl
 
User avatar
katastrofa
Posts: 10082
Joined: August 16th, 2007, 5:36 am
Location: Alpha Centauri

Re: Physicists, Stop the Churlishness

August 25th, 2020, 11:20 am

My thought was that it's nice that someone can see physics behind all that :-)
 
User avatar
Cuchulainn
Topic Author
Posts: 64439
Joined: July 16th, 2004, 7:38 am
Location: Drosophila melanogaster
Contact:

Re: Physicists, Stop the Churlishness

August 25th, 2020, 1:30 pm

My thought was that it's nice that someone can see physics behind all that :-)
Even better, mathematical physics.
"Compatibility means deliberately repeating other people's mistakes."
David Wheeler

http://www.datasimfinancial.com
http://www.datasim.nl
 
User avatar
Cuchulainn
Topic Author
Posts: 64439
Joined: July 16th, 2004, 7:38 am
Location: Drosophila melanogaster
Contact:

Re: Physicists, Stop the Churlishness

October 22nd, 2020, 11:51 am

Time and Space … It is not nature which imposes them upon us, it is we who impose them upon nature because we find them convenient.

 Henri Poincaré
"Compatibility means deliberately repeating other people's mistakes."
David Wheeler

http://www.datasimfinancial.com
http://www.datasim.nl
 
User avatar
Cuchulainn
Topic Author
Posts: 64439
Joined: July 16th, 2004, 7:38 am
Location: Drosophila melanogaster
Contact:

Re: Physicists, Stop the Churlishness

January 27th, 2021, 4:07 pm

Why do physicists make a distinction between time and space in PDEs? The two are the same. 
They make life difficult for themselves.

Hubble-Lemaître law – the observation that the farther away galaxies are, the faster they are moving away from Earth. Extrapolating this cosmic expansion backwards in time using the known laws of physics, the theory describes a high density state preceded by a singularity in which space and time lose meaning.[5]

'Losing meaning' is a euphemism methinks. Like negative probability hiding in lattices.
"Compatibility means deliberately repeating other people's mistakes."
David Wheeler

http://www.datasimfinancial.com
http://www.datasim.nl
 
User avatar
JohnLeM
Posts: 515
Joined: September 16th, 2008, 7:15 pm

Re: Physicists, Stop the Churlishness

January 28th, 2021, 9:53 am

Why do physicists make a distinction between time and space in PDEs? The two are the same. 
They make life difficult for themselves.

Hubble-Lemaître law – the observation that the farther away galaxies are, the faster they are moving away from Earth. Extrapolating this cosmic expansion backwards in time using the known laws of physics, the theory describes a high density state preceded by a singularity in which space and time lose meaning.[5]

'Losing meaning' is a euphemism methinks. Like negative probability hiding in lattices.
For PDE, don't we do the same ? To be more precise, the real difference might not be space and time for mathematicians, but boundary conditions.
By the way, had you a look to Illustris-TNG cosmic simulations ? They are using a very interesting numerical technic : smooth-particule hydrodynamic schemes. Note that these schemes can be very well handled with kernels, see this post.
 
User avatar
katastrofa
Posts: 10082
Joined: August 16th, 2007, 5:36 am
Location: Alpha Centauri

Re: Physicists, Stop the Churlishness

January 28th, 2021, 10:00 am

Too much Wikipedia knowledge is a dangerous thing.