Now I am become Bohmianism

1. About the title of this post:

Just before this Diwali, I had tweeted that I had made a resolution. The tweets went like this:

Let me note the text portions of these tweets (just in case I delete these some time later or so).

3:29 PM 13 Nov. 2020:

This year, Pune directly went from the monsoon air to the Diwali air. We seem to have tunnelled through the October heat!

3:55 PM, 13 Nov. 2020:

#Deepavali #Diwali #deepavali2020 #Diwali2020

[Diya lamp emoji, 3 times]

This is the *third* straight Diwali that I go jobless.

3:56 PM, 13 Nov. 2020:

My Diwali Resolution:

“Be a Bohmian (https://www.google.com/search?q=Bohmian+mechanics)

[Yes, there are going to be the usual New Year’s Resolutions according to the Western calender too!]

Alright.

We will come to the “tunnelling” part later. Also, the tweet related to my jobless-ness. [If the Indian IT industry has any sense of shame left at all, they would have prevented this circumstance. But more on this, too, later.]

For the time being, I want to focus on the last tweet, and say that, accordingly:

Now I am become Bohmianism.

As to the quaint grammar used in the expression, first consult this Wired article [^], also the Q&A at the Quora [^].

As to why I use “Bohmianism” instead of “a Bohmian”: Well, to know that, you have to understand Sanskrit. If you do, then refer to the Gita, Chapter 11, verse 32, the compound phrase “कालोऽस्मि” (“kaalo smi”). I just tried to keep a similar grammatical form. … But let me hasten to add that I am not a Sanskrit expert, and so, going wrong is always a possibility. However, I also think that here I have not.

Hence the title of this post.

Now, going over to the Bohmianism i.e. the Bohmian mechanics proper…


2. Material on the Bohmian mechanics (BM):

The following is a partial list of papers and other material on BM that I have downloaded. I am giving you the list in a roughly chronological order. However, my reading isn’t going to be in any particular order. I have not read them all yet. In fact, I’ve just got going with some them, as of now.

Also note, I expect that

  • Some of this material might have become outdated by now
  • I may run into some other related topics as my studies progress

Alright. On to the list…


2.1 Student theses:

Antony Valentini (1992) “On the pilot-wave theory of classical, quantum and subquantum physics,” Ph.D. Thesis, International School for Advanced Studies, Trieste

Caroline Colijn (2003) “The de Broglie-Bohm causal interpretation of quantum mechanics and its application to some simple systems,” Ph.D. Thesis, University of Waterloo.

Paulo Machado (2007) “Computational approach to Bohm’s quantum mechanics,” Ph.D. Thesis, McMaster University

Jeff Timko (2007) “Bohmian trajectories of the two-electron helium atom,” Master’s Thesis, University of Waterloo

Leopold Kellers (2017) “Making use of quantum trajectories for numerical purposes,” Master’s Thesis, Technische Universität München


2.2. Code:

Dane Odekirk (2012) “Python calculations of Bohmian trajectories,” GitHub, 12 December 2012. https://github.com/daneodekirk/bohm


2.3. Papers:

C. Philippidis, C. Dewdney and B. J. Hiley (1978) “Quantum interference and the quantum potential,” https://www.researchgate.net/publication/225228072

Berthold-Georg Englert, Marlan O. Scully, Georg Sussmann and Herbert Walther (1992) “Surrealistic Bohm trajectories,” Z. Naturforsch. 47 a, 1175–1186.

Robert E. Wyatt and Eric R. Bittner (2003) “Quantum mechanics with trajectories: quantum trajectories and adaptive grids,” arXiv:quant-phy/0302088v1 11 Feb 2003

Roderich Tumulka (2004) “Understanding Bohmian mechanics: A dialogue,” Am. J. Phys., vol. 72, no. 9, September 2004, pp. 1220–1226.

D.-A. Deckert, D. Dürr, P. Pickl (2007) “Quantum dynamics with Bohmian trajectories,” arXiv:quant-phy/0701190v2 13 May 2007

Guido Bacciiagaluppi and Antony Valentini (2009) “Quantum theory at the crossroads: Reconsidering the 1927 Solvay conference,” Cambridge UP, ISBN: 9780521814218 arXiv:quant-ph/0609184v2 24 Oct 2009 [Note: This is actually a book.]

M. D. Towler and N. J. Russell (2011) “Timescales for dynamical relaxation to the Born rule,” arXiv:1103.1589v2 [quant-ph] 27 Sep 2011

Michael Esfeld, Dustin Lazarovici, Mario Hubert, Detlef Dürr (2012) “The ontology of Bohmian mechanics,” preprint, British Journal for the Philosophy of Science

Travis Norsen (2013) “The pilot-wave perspective on quantum scattering and tunneling,” m. J. Phys., vol. 81, no. 4, April 2013, pp. 258–266. arXiv:1210.7265v2 [quant-ph] 9 Jan 2013

Travis Norsen (2013) “The pilot-wave perspective on spin,” arXiv:1305.1280v2 [quant-ph] 10 Sep 2013

Kurt Jung (2013) “Is the de Broglie-Bohm interpretation of quantum mechanics really plausible?,” Journal of Physics: Conference Series 442 (2013) 012060 doi:10.1088/1742-6596/442/1/012060

Samuel Colin and Antony Valentini (2014) “Instability of quantum equilibrium in Bohm’s dynamics,” Proc. R. Soc. A 470: 20140288. http://dx.doi.org/10.1098/rspa.2014.0288

W. B. Hodge, S. V. Migirditch and W. C. Kerr (2014) “Electron spin and probability current density in quantum mechanics,” Am. J. Phys., vol. 82, no. 7, July 2014, pp. 681–690

B. Zwiebach (2016) “Lecture 6,” Course Notes for MIT 8.04 Quantum Physics, Spring 2016.

Basil J. Hiley and Peter Van Reeth (2018) “Quantum trajectories: real or surreal?,” Entropy vol. 20, pp. 353 doi:10.3390/e20050353

Oliver Passon (2018) “On a common misconception regarding the de Broglie-Bohm theory,” Entropy vol. 20, no. 440. doi:10.3390/e20060440


2.4. Advanced papers:

Asher Yahalom (2018) “The fluid dynamics of spin,” Molecular Physics, April 2018, doi: 10.1080/00268976.2018.1457808. https://www.researchgate.net/publication/324512014, arXiv:1802:09331v1 [physics.flu-dyn] 3 Feb 2018

Siddhant Das and Detlef Dürr (2019) “Arrival time distributions of spin-1/2 particles,” Scientific Reports, https://doi.org/10.1038/s41598-018-38261-4

Siddhant Das, Markus Nöth, and Detlef Dür (2019) “Exotic Bohmian arrival times of spin-1/2 particles I—An analytical treatment,” arXiv:1901.08672v1 [quant-ph] 24 Jan 2019


2.5. Nonlinearity in the Bohmian mechanics:

To my surprise, I found that a form of non-linearity has been found to come up in the Bohmian mechanics too. I am sure it must have come as a surprise to many others too. [I will comment on this aspect quite some time later. For the time being, let me list some of the papers/presentations I’ve found so far.]

Sheldon Goldstein (1999) “Absence of chaos in Bohmian dynamics,” arXiv:quant-ph/9901005v1 6 Jan 1999

S. Sengupta, A. Poddar and P. K. Chattaraj (2000) “Quantum manifestations of the classical chaos in an undamped Duffing oscillator in presence of an external field: A quantum theory of motion study,” Indian Journal of Chemistry, vol. 39A, Jan–March 2000, pp. 316–322

A. Benseny, G. Albareda, A. S. Sanz, J. Mompart, and X. Oriols (2014) “Applied Bohmian mechanics,” arXiv:1406.3151v1 [quant-ph] 12 Jun 2014

Athanasios C. Tzemos (2016) “The mechanism of chaos in 3-D Bohmian trajectories,” Poster Presentation, https://www.researchgate.net/publication/305317081

Athanasios C. Tzemos (2018) “3-d Bohmian chaos: a short review,” Presentation Slides, RCAAM, Academy Of Athens

Athanasios C. Tzemos (2019) “Quantum entanglement and Bohmian Mechanics,” Presentation Slides 17 July 2019, RCAAM of the Academy of Athens

Klaus von Bloh (2020) “Bohm trajectories for the noncentral Hartmann potential,” Wolfram demonstration projects, https://www.researchgate.net/publication/344171771 (August 2020)

G. Contopoulos and A. C. Tzemos (2020) “Chaos in Bohmian quantum mechanics: a short review,” arXiv:2009.05867v1 [quant-ph] 12 Sep 2020


3. What happens to my new approach?

It was only yesterday that a neat thing struck me. Pending verification via simulations, it has the potential to finally bring together almost all of my research on the spinless particles. I’ve noted this insight in the hand-written journal (i.e. research notebook) that I maintain. I will be developing this idea further too. After all, Bohmians do study mainstream quantum mechanics and other interpretations, don’t they?

Due to the RSI, the simulations, however, will have to wait further. (The status is more or less the same. If I type for 2–3 hours, it’s easily possible that I can’t do much anything for the next 2–3 days.)

OK. Take care and bye for now.


A song I like:

(Hindi) देखा ना हाय रे सोचा ना (“dekhaa naa haay re sochaa naa”)
Singer: Kishore Kumar
Music: R. D. Burman
Lyrics: Rajinder Krishan

[Another song I used to love in my high-school days—who wouldn’t? … And, of course, I still do! A good quality audio I found is here [^]. I had not watched this movie until about a decade ago, on a CD (or may be on the TV). I’ve forgotten the movie by now. I don’t mind giving you the link for the video of this song; see here [^]. (In any case, it’s at least 3 orders of magnitude better than any so-called Lyrical Video Saregama has released for any song. The very idea of the Lyrical is, IMO, moronic.)]

 

 

A recruiter calls me to talk about a Data Science position in Pune…

A recruiter calls me this morning, from Hyderabad, all unexpectedly. No emails beforehand, no recruiter messages at a jobs-site, no SMSs, nothing. Just a direct call. They are considering me for a Data Science position, in Pune. She says it’s a position about Data Science and Python.

Asks about my total and relevant experience. I tell: 23 years in all, ~12 years in s/w development. She asks about my Python experience. I tell: Familiarity for, may be, 10 years if not more; actual use for, may be, 5–6 years. (Turns out to be since 2006, and since at least 2013–14 times, in connection with scripting while using the open-source FEM libraries, respectively.)

She then asks me about my data science experience.

I tell that I’ve been into it for about a year by now, but no professional, paid experience as such. Also add that I do understand kernels from the Kaggle competitions. (In fact, I can think of bringing about meaningful variations in them too.)

She asks about my last job. I tell: Academia, recently, after PhD. (She sounds a bit concerned, may be confused. She must be looking at my resume.) But before that, I was in the software field, I say. And now, am now looking for a Data Science position. I then add: In the software development field, my last job was as a Systems Architect, reporting directly to the CEO. … By this time, she must have spotted this software experience listing in my resume. She says “OK,” with just a shade of a sense of satisfaction audible in the way she sounds.

She then again asks me about my Data Science experience. I now tell her directly: Paid experience, 0 (zero) years.

Hearing it, she keeps the phone down. Just like that. Without any concluding remarks. Not even just a veneer of a courtesey like a hurried “OK, if you are found suitable, we will get back to you” etc. Nothing. Not even that. No thanks, nothing.

She. Just. Keeps. The. Phone. Down.


It must be a project for one of those companies from America, especially from California, especially from the San Francisco Bay Area. Only they can be as dumbidiots* as that. And, they could very well be one of those “Capitalist”s, esp. Indians—there and here. “You are just as good as your performance on your last job!” Said sternly. And, the quote taken literally. In the current context, it is obviously taken to mean that I am as good as zero, when it comes to Data Science positions.

Dumbidiots*. Zeno’s descendents. They don’t deserve to hire me.

But these stupididiots* do amass a lot of money for themselves. Help build the nation. Etc.

Rich idiocy.


*By the rules of the Sanskrit grammar, this “sandhi” is correct. English is an Indo-European language. So, such a “sandhi” should be allowed. The jointed word means something like “k’mt’om” [^] “moorkha”. (You look up “moorkha”.)


A song I like:
(Hindi) “hum the, woh thee, aur, samaa rangeen…”
Singer: Kishore Kumar
Lyrics: Majrooh Sultanpuri
Music: S. D. Burman

 

Data Science links—1

Oakay… My bookmarks library has grown too big. Time to move at least a few of them to a blog-post. Here they are. … The last one is not on Data Science, but it happens to be the most important one of them all!



On Bayes’ theorem:

Oscar Bonilla. “Visualizing Bayes’ theorem” [^].

Jayesh Thukarul. “Bayes’ Theorem explained” [^].

Victor Powell. “Conditional probability” [^].


Explanations with visualizations:

Victor Powell. “Explained Visually.” [^]

Christopher Olah. Many topics [^]. For instance, see “Calculus on computational graphs: backpropagation” [^].


Fooling the neural network:

Julia Evans. “How to trick a neural network into thinking a panda is a vulture” [^].

Andrej Karpathy. “Breaking linear classifiers on ImageNet” [^].

A. Nguyen, J. Yosinski, and J. Clune. “Deep neural networks are easily fooled: High confidence predictions for unrecognizable images” [^]

Melanie Mitchell. “Artificial Intelligence hits the barrier of meaning” [^]


The Most Important link!

Ijad Madisch. “Why I hire scientists, and why you should, too” [^]


A song I like:

(Western, pop) “Billie Jean”
Artist: Michael Jackson

[Back in the ’80s, this song used to get played in the restaurants from the Pune camp area, and also in the cinema halls like West-End, Rahul, Alka, etc. The camp area was so beautiful, back then—also uncrowded, and quiet.

This song would also come floating on the air, while sitting in the evening at the Quark cafe, situated in the middle of all the IITM hostels (next to skating rink). Some or the other guy would be playing it in a nearby hostel room on one of those stereo systems which would come with those 1 or 2 feet tall “hi-fi” speaker-boxes. Each box typically had three stacked speakers. A combination of a separately sitting sub-woofer with a few small other boxes or a soundbar, so ubiquitous today, had not been invented yet… Back then, Quark was a completely open-air cafe—a small patch of ground surrounded by small trees, and a tiny hexagonal hut, built in RCC, for serving snacks. There were no benches, even, at Quark. People would sit on those small concrete blocks (brought from the civil department where they would come for testing). Deer would be roaming very nearby around. A daring one or two could venture to come forward and eat pizza out of your (fully) extended hand!…

…Anyway, coming back to the song itself, I had completely forgotten it, but got reminded when @curiouswavefn mentioned it in one of his tweets recently. … When I read the tweet, I couldn’t make out that it was this song (apart from Bach’s variations) that he was referring to. I just idly checked out both of them, and then, while listening to it, I suddenly recognized this song. … You see, unlike so many other guys of e-schools of our times, I wouldn’t listen to a lot of Western pop-songs those days (and still don’t). Beatles, ABBA and a few other groups/singers, may be, also the Western instrumentals (a lot) and the Western classical music (some, but definitely). But somehow, I was never too much into the Western pop songs. … Another thing. The way these Western singers sing, it used to be very, very hard for me to figure out the lyrics back then—and the situation continues mostly the same way even today! So, recognizing a song by its name was simply out of the question….

… Anyway, do check out the links (even if some of them appear to be out of your reach on the first reading), and enjoy the song. … Take care, and bye for now…]