Carlo Rovelli on the relational interpretation of QM

2020-09-26 Thread Bruce Kellett
This is a video of a short talk Carlo Rovelli gave on the Relational 
Interpretation of Quantum Mechanics (RQM)


https://www.youtube.com/watch?v=syb3WfSGRoE


A more detailed account is given in this paper from a Royal Society meeting:

arXiv:1712.02894v5


Rovelli's RQM is an interesting alternative perspective -- similar to 
QBism, but without the extreme instrumentalism of that approach. I think 
that RQM contains some interesting insights, in particular, the 
rejection of "object realism" about the Schrodinger wave function. 
Following Dirac and Heisenberg, Rovelli thinks that the Schrodinger 
equation is an essentially misleading attempt to render the discreteness 
of the quantum in terms of a continuous wave.  At best, the wave 
function is simply a book-keeping device, keeping records of past 
interactions.


I go along with much of this -- it is certainly better than QBism in 
that it retains a viable form of realism -- but Rovelli comes seriously 
unstuck when he attempts to give a fully local account of the EPR 
correlations...


arXiv:quant-ph/0604064v3

Bruce

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The Handmaid's Tale

2020-09-26 Thread John Clark
The new US supreme court nominee will be Amy Coney Barrett, and she is just
the sort of person you would expect, a religious crockpot. She is a member
of an extreme right wing Catholic cult called "The People of Praise"; they
speak in tongues, believe in biblical prophecy, and in divine healing.
Members of the cult swear a lifetime oath of allegiance to one another and
are assigned a ideology coach called a “head” for men and a “HANDMAID” for
women to make sure nobody strays from the official dogma. The "heads" and
"handmaids" issue orders on who to date, who to marry, where to live,
whether to take a job, whether to buy a home, and how to raise children.
Part of the ideology of People of Praise is that husbands should give
orders to their wives and only men should have authority over the family.

During her confirmation hearing in 2017 to be a federal judge Barrett said
 "*I take my faith seriously and I’m a faithful Catholic*". In 2013 she
said: "*I tend to agree with those who say that a Justice’s duty is to the
Constitution and that it is thus more legitimate for her to enforce her
best understanding of the Constitution rather than a precedent she thinks
clearly in conflict with it*"; and as a judge she approved a Indiana law
banning abortions of a deformed fetus (although her opinion was later
overturned by a higher court and the Indiana law ruled unconstitutional).
So when she is approved Roe v. Wade Will be as dead as a doornail and we're
back to the 1950's and coathanger abortions. Barrett also criticized Chief
Justice Roberts for his opinion that saved Obama’s Affordable Care Act; so
in the middle of a global pandemic the health care coverage of tens of
millions of people will be as dead as a doornail too when she hears her
first case on October 10.

To those who claim Barrett's religious views will not effect her legal
opinions I will remind you that in 2006 she said  “*If you can keep in mind
that your fundamental purpose in life is not to be a lawyer, but to know,
love and serve God, you truly will be a different kind of lawyer.*” Amy
Coney Barret would also be the youngest justice on the bench, so she could
be around for many decades.

John K Clark

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Physics and AI with Julia

2020-09-26 Thread Philip Thrift


https://github.com/SciML/SciMLTutorials.jl

Video and tutorials for doing scientific machine learning and 
high-performance differential equation solving with Julia (programming 
language).

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@philipthrift

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