Angel "Java" Lopez en Blog

Sigue la cuarentena acá en Buenos Aires. Tiempo de escribir las resoluciones del nuevo mes, pero antes una revision de las del mes anterior:

- Escribir sobre Matemáticas [completo] ver repositorio
- Escribir sobre Física [pendiente]
- Escribir sobre Historia de las Matemáticas [pendiente]
- Escribir sobre Historia de la Ciencia [pendiente]
- Estudiar blues en guitarra [completo]

OKR (Objectives, Key Results) personales del trimester Junio, Julio, Agosto:

Objetivo: Aprender y compartir matemáticas
Resultado clave: Escribir tres artículos sobre geometría algebraic repositorio
Resultado clave: Escribir tres artículos sobre ecuaciones elípticas artículo 1 repositorio
Resultado clave: Escribir seis artículos sobre teoría de números

Objetivo: Aprender y compartir física
Resultado clave: Escribir tres artículos de física cuántica
Resultado clave: Escribir tres artículos de física clásica

Mis resoluciones para el nuevo mes:

- Escribir sobre Matemáticas
- Escribir sobre Física
- Escribir sobre Historia de las Matemáticas
- Escribir sobre Historia de la Ciencia
- Estudiar blues en guitarra

Nos leemos!

Angel "Java" Lopez
http://www.ajlopez.com
https://twitter.com/ajlopez

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Marcel Grossmann and his contribution to the general theory of relativity
http://inspirehep.net/record/1269392/plots?ln=en

History: Einstein was no lone genius
https://www.nature.com/news/history-einstein-was-no-lone-genius-1.18793

Einstein's 1912-1913 struggles with Gravitation Theory: Importance of Static Gravitational Fields Theory
https://arxiv.org/ftp/arxiv/papers/1202/1202.2791.pdf

General Covariance
https://en.wikipedia.org/wiki/General_covariance

Caminos cuánticos fuertemente correlacionados simulados usando 12 cúbits
https://francis.naukas.com/2019/05/27/caminos-cuanticos-fuertemente-correlacionados-simulados-usando-12-cubits/

Una colisión con un planeta enano para explicar el misterio de la cara oculta de la Luna
https://danielmarin.naukas.com/2019/05/27/una-colision-con-un-planeta-enano-para-explicar-el-misterio-de-la-cara-oculta-de-la-luna/

Cuantizando el mundo - Alberto Aparici | OGMIOS 2019
https://www.youtube.com/watch?v=1nwe0TlB95Q

¿Qué hay dentro de un agujero negro?
http://cienciaclip.naukas.com/video/dentro-agujero-negro/

Nos leemos!

Angel "Java" Lopez
http://www.ajlopez.com
http://twitter.com/ajlopez

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The Jaguar and the Fox
https://www.theatlantic.com/magazine/archive/2000/07/the-jaguar-and-the-fox/378264/
Hard as he tried, Murray Gell-Mann could never make himself into a legend like his rakish colleague and collaborator, Richard Feynman -- even if he was probably the greater physicist

Big Bounce Simulations Challenge the Big Bang
https://www.quantamagazine.org/big-bounce-simulations-challenge-the-big-bang-20200804/

Ask Ethan: What Is The Fine Structure Constant And Why Does It Matter?
https://www.forbes.com/sites/startswithabang/2019/05/25/ask-ethan-what-is-the-fine-structure-constant-and-why-does-it-matter

COVID-19 Is Raging. How Safe Is Your Backyard Party?
https://www.quantamagazine.org/covid-19-is-raging-how-safe-is-your-backyard-party-20200806/

Quanta Magazine Topics
https://www.quantamagazine.org/topics

Extra DNA May Make Unlikely Hybrid Fish Possible
https://www.quantamagazine.org/extra-dna-may-make-unlikely-hybrid-fish-possible-20200805/

Creating Neanderthal 'Mini-Brains' With Ancient DNA, CRISPR
http://discovermagazine.com/2019/january/ancient-brains#.XOqYoEW8B4M.twitter

Pay attention, Albert Einstein!
https://www.newscientist.com/article/mg13718543-900-pay-attention-albert-einstein/

Nos leemos!

Angel "Java" Lopez
http://www.ajlopez.com
http://twitter.com/ajlopez

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Murray Gell-Mann Building Dedication Ceremony
https://www.youtube.com/watch?v=8bOl0i1OORA&feature=youtu.be

La geometría del potencial que confina un electrón en un punto cuántico
https://francis.naukas.com/2019/05/25/l
a-geometria-del-potencial-que-confina-un-electron-en-un-punto-cuantico/

How to Design (or at Least Model) Mixed Dog Breeds
https://www.quantamagazine.org/puzzle-answers-about-sexual-inheritance-and-mixed-dog-breeds-20200731/

LOG#245. What is fundamental?
http://www.thespectrumofriemannium.com/2020/07/26/log245-what-is-fundamental/

An Alternative to Dark Matter Passes Critical Test
https://www.quantamagazine.org/modified-gravity-theory-passes-a-critical-test-20200728/

An integrated encyclopedia of DNA elements in the human genome
https://www.nature.com/articles/nature11247

Why Are Plants Green? To Reduce the Noise in Photosynthesis.
https://www.quantamagazine.org/why-are-plants-green-to-reduce-the-noise-in-photosynthesis-20200730

Our Genes May Explain Severity of COVID-19 and Other Infections
https://www.quantamagazine.org/our-genes-may-explain-severity-of-covid-19-and-other-infections-20200727/

Nos leemos!

Angel "Java" Lopez
http://www.ajlopez.com
http://twitter.com/ajlopez

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Wear your math seatbelt, it's time for another differential geometry thread!
https://twitter.com/LucaAmb/status/1289244374996406273

How to calculate fibonnacci numbers
https://twitter.com/_julesh_/status/1289520483348688896

The Pythagorean Theorem in spherical geometry
https://twitter.com/SamuelGWalters/status/1278807718707380224

Great Woman of Mathematics: Dr. Chelsea Walton, born 1983
https://twitter.com/GWOMaths/status/1229338609741901824

Mathematics is one of few disciplines that are defined entirely by their method, not but their subject
https://twitter.com/amar_hh/status/1272550404484730881

The Perplexing Mathematics of the Napkin Ring Paradox
http://shortsleeveandtieclub.com/the-perplexing-mathematics-of-the-napkin-ring-paradox/?platform=hootsuite

Greek Vatican Manuscript 190
http://mathforum.org/geometry/wwweuclid/vatms.htm

Encontrado Nuevo Patrón en los Números Primos
https://www.gaussianos.com/encontrado-nuevo-patron-en-los-numeros-primos/

Nos leemos!

Angel "Java" Lopez
http://www.ajlopez.com
https://twitter.com/ajlopez

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The Brain Reshapes Our Malleable Senses to Fit the World
https://www.quantamagazine.org/the-brain-reshapes-our-malleable-senses-to-fit-the-world-20200324

He Found "Islands of Fertility" Beneath Antarctica"s Ice
https://www.quantamagazine.org/john-priscu-finds-life-in-antarcticas-frozen-lakes-20200720/

Viruses Can Scatter Their Genes Among Cells and Reassemble
https://www.quantamagazine.org/viruses-can-scatter-their-genes-among-cells-and-reassemble-20190521

Sometimes, physics is pretty darn cool
https://www.instagram.com/p/B1bOFbfgaYx/?utm_source=ig_web_copy_link

Jupiter"s Iconic Red Spot is Shrinking, What Could Happen Next?
https://www.youtube.com/watch?v=fW-YrNaxJFU

A history of the electron: JJ and GP Thomson
https://www.chemistryworld.com/culture/a-history-of-the-electron-jj-and-gp-thomson/6090.article

Reseña: «Mi vida en la ciencia» de Sydney Brenner
https://francis.naukas.com/2019/05/19/resena-mi-vida-en-la-ciencia-de-sydney-brenner/

We're sorry to announce the passing of @NobelPrize Laureate and complexity giant Murray Gell-Mann, one of the 20th Century's greatest physicists – pioneer, SFI co-founder, prophet of the quark
https://twitter.com/sfiscience/status/1131969981686665216

Nos leemos!

Angel "Java" Lopez
http://www.ajlopez.com
http://twitter.com/ajlopez

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The Two Forms of Mathematical Beauty
https://www.quantamagazine.org/how-is-math-beautiful-20200616/

The beauty of quaternion multiplication
https://twitter.com/johncarlosbaez/status/1285247097525026819

Computation graphs and graph computation
http://breandan.net/2020/06/30/graph-computation/?_lrsc=c44380ec-30c2-4bcb-af16-90861cd8fc50

Mathematicians Will Never Stop Proving the Prime Number Theorem
https://www.quantamagazine.org/mathematicians-will-never-stop-proving-the-prime-number-theorem-20200722/

The Tricky Math of Herd Immunity for COVID-19
https://www.quantamagazine.org/the-tricky-math-of-covid-19-herd-immunity-20200630/

A Number Theorist Who Solves the Hardest Easy Problems
https://www.quantamagazine.org/james-maynard-solves-the-hardest-easy-math-problems-20200701/

The Math of Social Distancing Is a Lesson in Geometry
https://www.quantamagazine.org/the-math-of-social-distancing-is-a-lesson-in-geometry-20200713/

Diophantine Set
https://en.wikipedia.org/wiki/Diophantine_set

Nos leemos!

Angel "Java" Lopez
http://www.ajlopez.com
https://twitter.com/ajlopez

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A Gentle Kiss: How the Kuiper Belt Object Ultima Thule Was Born
https://www.space.com/ultima-thule-birth-new-horizons-first-science.html

El 11 de diciembre de 1998, un cohete despegaba de Cabo Cañaveral. A bordo viajaba el Mars Climate Orbiter, un satélite meteorológico con destino a Marte.
https://twitter.com/ValeArvejita/status/946395150238015488

El primer candidato a estrella de neutrones producto de la fusión de dos enanas blancas
https://francis.naukas.com/2019/05/21/el-primer-candidato-a-estrella-de-neutrones-producto-de-la-fusion-de-dos-enanas-blancas/

How Your Heart Influences What You Perceive and Fear
https://www.quantamagazine.org/how-your-heart-influences-what-you-perceive-and-fear-20200706/

Flatten the Curve of Armchair Epidemiology
https://medium.com/@noahhaber/flatten-the-curve-of-armchair-epidemiology-9aa8cf92d652

Nature Versus Nurture? Add "Noise" to the Debate.
https://www.quantamagazine.org/nature-versus-nurture-add-noise-to-the-debate-20200323

Boris Johnson: why you must stay at home
https://www.spectator.co.uk/article/full-text-boris-johnson-announces-lockdown

Coronavirus Datos de España
https://twitter.com/jnikitas/status/1242494861984530432

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Angel "Java" Lopez
http://www.ajlopez.com
http://twitter.com/ajlopez

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Bubonic Plague Strikes In Mongolia: Why Is It Still A Threat?
https://www.npr.org/sections/goatsandsoda/2019/05/07/721167330/bubonic-plague-strikes-in-mongolia-why-is-it-still-a-threat

The Scientist Leading the World"s Aurora Hunters
https://www.quantamagazine.org/liz-macdonald-leads-the-worlds-aurora-hunters-20200709/

We need to talk about this Hydroxychloroquine + Azithromycin thing
https://twitter.com/jpogue1/status/1241138975802359813

Why Is Glass Rigid? Signs of Its Secret Structure Emerge
https://www.quantamagazine.org/why-is-glass-rigid-signs-of-its-secret-structure-emerge-20200707/

Spotting Quantum Black Holes in the Lab
https://www.quantamagazine.org/john-preskill-quantum-computing-may-help-us-study-quantum-gravity-20200715/

A Paradox of Parasite Prolonging the Life of Its Host. Pearl Mussel Can Disable the Accelerated Senescence Program in Salmon
https://link.springer.com/article/10.1007/s10525-005-0112-4

Why the Tiny Weight of Empty Space Is Such a Huge Mystery
https://www.quantamagazine.org/why-the-dark-energy-problem-spawned-the-multiverse-hypothesis-20180312/

Willem Einthoven (1860-1927)
https://www.historiadelamedicina.org/einthoven.html

Nos leemos!

Angel "Java" Lopez
http://www.ajlopez.com
http://twitter.com/ajlopez

Seguimos en cuarentena, acá en Buenos Aires, Argentina. Primero, repaso de las resoluciones del mes anterior:

- Escribir sobre Matemáticas [completo] ver repositorio
- Escribir sobre Física [completo] ver post
- Escribir sobre Historia de las Matemáticas [pendiente]
- Escribir sobre Historia de la Ciencia [completo] ver post 
- Estudiar blues en guitarra [completo]

Sobre los OKR (Objectives, Key Results) personales del trimester Junio, Julio, Agosto, agrego un item:

Objetivo: Aprender y compartir matemáticas
Resultado clave: Escribir tres artículos sobre geometría algebraic
Resultado clave: Escribir tres artículos sobre ecuaciones elípticas
Resultado clave: Escribir seis artículos sobre teoría de números

Objetivo: Aprender y compartir física
Resultado clave: Escribir tres artículos de física cuántica
Resultado clave: Escribir tres artículos de física clásica

Mis resoluciones para el nuevo mes:

- Escribir sobre Matemáticas
- Escribir sobre Física
- Escribir sobre Historia de las Matemáticas
- Escribir sobre Historia de la Ciencia
- Estudiar blues en guitarra

Nos leemos!

Angel "Java" Lopez
http://www.ajlopez.com
https://twitter.com/ajlopez

Un tema que tengo pendiente de estudiar con cierta profundidad en física, es el de las teorías de campos. Debería comenzar con alguna teoría clásica, como el elctromagnetismo de Maxwell. Pero no hay que olvidarse que los campos se fueron extendiendo hasta llegar de uso prácticamente indispensable en física cuántica. Yq estuve escribiendo sobre las causas de esa extensión en la serie de posts La necesidad de una teoría cuántica de campos. Uno de los puntos tratados ahí fue que no hay un claro predominio epistemológico (podríamos decir) entre campos y partículas, y que los campos cuánticos justamente se cuantifican, llegando a expresar partículas como campos.

En estos días leo el magistral libro de Steven Weinberg: "Quantum Theory of Fields, Fundations, Volume I":

I have tried in this book to present the quantum theory of fields in a logical manner, emphasizing the deductive trail that ascends from the physical principles of special relativity and quantum mechanics. This approach necessarily draws me away from the order in which the subject in fact developed. To take one example, it is historically correct that quantum field theory grew in part out of a study of relativistic wave equations, including the Maxwell, Klein-Gordon, and Dirac equations. For this reason it is natural that courses and treatises on quantum field theory introduce these wave equations early, and give them great weight. Nevertheless, it has long seemed to me that a much better starting point is Wigner's definition of particles as representations of the inhomogeneous Lorentz group, even though this work was not published until 1939 and did not have a great impact for many years after. In this book we start with particles and get to the wave equations later.

Recuerdo vagamente estas ideas de Wigner: pero en general, son ideas que no se tratan en los libros clásicos de estudio (en carreras de ingeniería, por ejemplo) sobre física cuántica. Muchas veces los textos se concentran en el desarrollo de la MECANICA cuántica, desde Rutherford y Bohr, hasta de Broglie, Heisenberg, Schrodinger, Born, Jordan y Dirac. Prácticamente no se trata en esos casos de las teorías cuánticas de campos, salvo alguna mención esporádica. Y entonces, Wigner pasa desapercibido (de paso, Dirac se casó con la hermana de Wigner, eran cuñados). El tema a estudiar está tratado someramente en el artículo de la Wikipedia:

Particle physics and representation theory

En este blog, comenzó a aparecer el tema en la serie

Teoría de Grupos y Partículas Elementales

Ver también:

The 'Useless' Perspective That Transformed Mathematics sobre teoría de la representación
Los conceptos de campo, partícula, partícula virtual y vacío donde se mencionan representaciones lineales y simetrías

Sirva esta nota como recordatorio para estudiar este intesante tema.

Nos leemos!

Angel "Java" Lopez
http://www.ajlopez.com
https://twitter.com/ajlopez

El teorema de Noether, probado en 1915, publicado en 1918 junto con otro teorema, tiene un cualidad: consigue aunar distintos aspectos de la matemática y de la física, de los siglos XIX y XX, de una forma tan particular, que su estudio termina derivando en la comprensión de otros temas, desde teorías de relatividad a cuántica, desde campos hasta teorías gauge, y así.

De esta forma, su estudio es como una excusa para sumergirse en funciones, funcionales, lagrangianos, hamiltonianos, acciones, principio de minima acción, corrientes conservadas. Quería compartir en esta serie de posts algunas notas sobre el tema.

También espero poder compartir notas biográficas sobre Emmy Noether, que tanto hizo por el avance de las matemáticas abstractas (desde teoría de invariantes, a anillos e ideales). Siendo mujer, entre los siglos XIX y XX, no le fue fácil integrarse al mundo académico, pero hoy es reconocida no solo por el teorema que nos ocupa, sino por sus avances en matemáticas, especialmente en algebra conmutativa.

Mi primera referencia para compartir, es el libro "Emmy Noether's Wonderful Theorem" de Dwight E, Neuensshwander. El autor describe al principio un panorama del libro, de los temas que trata. Y una de los más interesantes aportes iniciales, es dar una lista de preguntas primarias:

What is "symmetry"
What is "invariance"
What are "conservation laws"
Who was "Noether" of Noether"s theorem?
How are symmetry, invariance, and conservation laws related?
What are Lagrangians and Hamiltonians? Which is more
fundamental?
What are generalized coordinates and their velocities?
What are "canonically conjugate" variables?
What are continuous symmetries?
What are discrete symmetries?
What are "tensors"?

Luego añade preguntas auxiliaries

What is "gauge invariance"
What is "minimal coupling"
What are "covariant derivatives"
What is the role of Hamilton—]acobi theory?
What is the "]acobian" of a transformation?
What is "phase space"? Why does anyone care?
Why are complex variables used to describe wave functions?
Why is the Lagrangian for mechanics kinetics minus potential energy?
What are "unitarity" and "Hermitian" operators? Why do we need them?
Why does Noether"s theorem consider only infinitesimal transformations?
Where does Hamilton"s principle come from? Is it related to Fermat"s principle?
Why do the Lagrangians of complex scalar fields drop the factor of 1/2 that appears with real scalar fields?
Why do we need two kinds of vector in spacetime, some with
upper indices and some with lower indices?
What are "equations of continuity" and how do they describe
conservation locally?
What are the symmetry groups SU(N) and why are they used?
How can "space inversion" be relevant to the real world?
Are positrons really electrons going backward in time?

Ya solamente leyendo estas preguntas, temenos una idea de lo profundo que pueden ser los temas que abarca tratar de comprender estos teoremas de Noether. Notablemente, la fama del teorema se acrecentó con el tiempo: al comienzo, solo captó la atención de especialistas, como el propio Einstein. Fue con los años, con la aparición de nuevas teorías de campos, más allá del electromagnetismo clásico, que los aportes de Emmy Noether cobraron mayor difusion e importancia.

Algunos post relacionados:

Notas sobre Lagrangianos y Hamiltonianos (serie)
Simetría, primeros pasos
Ideales en Anillos

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Angel "Java" Lopez
http://www.ajlopez.com
https://twitter.com/ajlopez

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Australopithecus africanus
https://twitter.com/cepitadenaranja/status/1242592257917833223

Machine Learning Takes On Antibiotic Resistance
https://www.quantamagazine.org/machine-learning-takes-on-antibiotic-resistance-20200309/

Black, Hot Ice May Be Nature"s Most Common Form of Water
https://www.quantamagazine.org/black-hot-superionic-ice-may-be-natures-most-common-form-of-water-20190508/

Ventilator Project Update: March 21th, 2020
https://medium.com/@brucefenton/ventilator-project-update-march-21th-2020-bd2ef9d587e0

The British govt is saying let the virus spread so 60% of Brits become infected and herd immunity is reached
https://twitter.com/DoctorYasmin/status/1238815504669671429

Alibaba"s new AI system can detect coronavirus in seconds with 96% accuracy
https://thenextweb.com/neural/2020/03/02/alibabas-new-ai-system-can-detect-coronavirus-in-seconds-with-96-accuracy/

When Good Scientists Go Bad
https://thenib.com/when-good-scientists-go-bad

Memes, Genes, and Sex Differences—An Interview with Dr. Steve Stewart-Williams
https://quillette.com/2019/05/14/memes-genes-and-sex-differences-an-interview-with-dr-steve-stewart-williams/

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Angel "Java" Lopez
http://www.ajlopez.com
http://twitter.com/ajlopez

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Cuestión de tamaño: por qué no es buena idea fabricar mascarillas caseras
https://twitter.com/deborahciencia/status/1243115286670303234

Cosmic Rays May Explain Life"s Bias for Right-Handed DNA
https://www.quantamagazine.org/cosmic-rays-may-explain-lifes-bias-for-right-handed-dna-20200629/

Imperial College report on COVID-19
https://twitter.com/jeremycyoung/status/1239975682643357696

What Is the Geometry of the Universe?
https://www.quantamagazine.org/what-is-the-geometry-of-the-universe-20200316/

"Knitting Is Coding" and Yarn Is Programmable in This Physics Lab
https://www.nytimes.com/2019/05/17/science/math-physics-knitting-matsumoto.html

Scientists Have Confirmed a New DNA Structure Inside Human Cells
https://www.sciencealert.com/scientists-have-confirmed-a-new-dna-structure-inside-living-cells-i-motif-intercalated

Kinds of Ice
http://math.ucr.edu/home/baez/diary/november_2015.html#november_10

Coronavirus: ¿aumentar los tests es la receta para moderar el derrumbe de la economía?
https://www.clarin.com/economia/coronavirus-aumentar-tests-receta-economia-derrumbe-_0_S9MG14gff.html

Nos leemos!

Angel "Java" Lopez
http://www.ajlopez.com
http://twitter.com/ajlopez

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Blaschko's lines
https://en.wikipedia.org/wiki/Blaschko%27s_lines

The (but I"m Not a) Crackpot Style Guide
https://4gravitons.com/2016/07/01/the-but-im-not-a-crackpot-style-guide/

The mystery of the true coronavirus death rate
https://www.ft.com/content/f3796baf-e4f0-4862-8887-d09c7f706553

New physics discovery from the Microsoft Quantum team: topology with a twist
https://cloudblogs.microsoft.com/quantum/2020/03/27/new-physics-discovery-microsoft-quantum-topology-with-a-twist/

Viruses Can Scatter Their Genes Among Cells and Reassemble
https://www.quantamagazine.org/viruses-can-scatter-their-genes-among-cells-and-reassemble-20190521/

Impact of non-pharmaceutical interventions (NPIs) to reduce COVID19 mortality and healthcare demand
https://www.imperial.ac.uk/media/imperial-college/medicine/sph/ide/gida-fellowships/Imperial-College-COVID19-NPI-modelling-16-03-2020.pdf

Un informe advierte de que las medidas de distanciamiento social podrían ser necesarias hasta 18 meses
https://elpais.com/ciencia/2020-03-17/un-informe-advierte-de-que-las-medidas-de-distanciamiento-social-podrian-ser-necesarias-hasta-18-meses.html

Method of estimating the number of infected people from the number of deaths
https://twitter.com/wtgowers/status/1242823142088851456

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Angel "Java" Lopez
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John Hopkins Coronavirus
https://coronavirus.jhu.edu/map.html

A multiplanet system of super-Earths orbiting the brightest red dwarf star GJ 887
https://science.sciencemag.org/content/368/6498/1477

Stem Cells Remember Tissues" Past Injuries
https://www.quantamagazine.org/stem-cells-remember-tissues-past-injuries-20181112/

Coronavirus: cómo funcionan los respiradores y por qué la desesperada carrera por fabricar más es clave en la batalla contra covid-19
https://www.bbc.com/mundo/noticias-52060716

Respiratory virus shedding in exhaled breath and efficacy of face masks
https://www.nature.com/articles/s41591-020-0843-2

Astrophysics Signal Does What The LHC Cannot: Constrain Quantum Gravity And String Theory
https://www.forbes.com/sites/startswithabang/2020/04/03/astrophysics-signal-does-what-the-lhc-cannot-constrain-quantum-gravity-and-string-theory/#695ed2252507

The proximal origin of SARS-CoV-2
https://www.nature.com/articles/s41591-020-0820-9#ref-CR20
https://twitter.com/pmarsupia/status/1246891625630048256

The outbreak that invented intensive care
https://www.nature.com/articles/d41586-020-01019-y

Nos leemos!

Angel "Java" Lopez
http://www.ajlopez.com
http://twitter.com/ajlopez

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Males Are the Taller Sex. Estrogen, Not Fights for Mates, May Be Why.
https://www.quantamagazine.org/men-are-the-taller-sex-estrogen-not-fights-for-mates-may-be-why-20200608

Sorry, Astronomers: Practically All Of The Universe's Matter Is Still Missing
https://www.forbes.com/sites/startswithabang/2020/06/04/sorry-astronomers-practically-all-of-the-universes-matter-is-still-missing/#4c22e6393942

"It opens up a whole new universe": Revolutionary microscopy technique sees individual atoms for first time
https://www.nature.com/articles/d41586-020-01658-1

COVID-19 Projections
https://covid19.healthdata.org/projections?sfns=mo

Neil Ferguson on Covid
https://twitter.com/neil_ferguson/status/1243294815200124928

The Environment and Disease: Association or Causation?
https://fermatslibrary.com/s/the-environment-and-disease-association-or-causation

Solution: "Is It Turtles All the Way Down?"
https://www.quantamagazine.org/puzzle-solution-is-it-turtles-all-the-way-down-20200327/

Milky Way Dark Matter Signals in Doubt after Controversial New Papers
https://www.scientificamerican.com/article/milky-way-dark-matter-signals-in-doubt-after-controversial-new-papers/

Nos leemos!

Angel "Java" Lopez
http://www.ajlopez.com
http://twitter.com/ajlopez

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Aniversario de Alan Turing
https://www.microsiervos.com/archivo/ordenadores/aniversario-de-alan-turing.html

Why Gravity Is Not Like the Other Forces
https://www.quantamagazine.org/why-gravity-is-not-like-the-other-forces-20200615/

Beth nació en 1941 en Brooklyn. Tres meses antes de la fecha prevista. La única opción sería llevarla al Luna Park.
https://twitter.com/ValeArvejita/status/1273401243898195968

The Trouble with Counting Aliens
https://www.wired.com/story/the-trouble-with-counting-aliens/

How to Breed a Pomsky and Other Questions About Dogs and Sex
https://www.quantamagazine.org/how-to-breed-a-pomsky-and-other-questions-about-dogs-and-sex-20200618/

Literature Search, Inspire, Most Cited
https://inspirehep.net/literature?sort=mostcited&size=25&page=1&q=topcite%201000%2B

A Model of Leptons
https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.19.1264

The Large N Limit of Superconformal Field Theories and Supergravity
https://arxiv.org/abs/hep-th/9711200

Nos leemos!

Angel "Java" Lopez
http://www.ajlopez.com
http://twitter.com/ajlopez

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Is the alien chunk Oumuamua actually a hydrogen iceberg?
https://www.syfy.com/syfywire/is-the-alien-chunk-oumuamua-actually-a-hydrogen-iceberg

If A and B are observables AB is not, but it's made of i(AB-BA) and AB+BA
https://twitter.com/johncarlosbaez/status/1268571813170176000

Quantum Journal
https://quantum-journal.org/

A Surprise Discovery Points to the Source of Fast Radio Bursts
https://www.quantamagazine.org/a-surprise-discovery-shows-magnetars-create-fast-radio-bursts-20200611/

Graph-theoretic Simplification of Quantum Circuits with the ZX-calculus
https://quantum-journal.org/papers/q-2020-06-04-279/

La tabla periódica que conoces no es la única que existe
https://www.larazon.es/ciencia/20200605/buwlukrmhnb5nlsh22ojzohsqy.html

What Came Before the Big Bang?
https://www.discovermagazine.com/the-sciences/what-came-before-the-big-bang

Nuevos resultados que apoyan la conjetura AdS/CFT de Maldacena
https://francis.naukas.com/2020/06/07/nuevos-resultados-que-apoyan-la-conjetura-ads-cft-de-maldacena/

Nos leemos!

Angel "Java" Lopez
http://www.ajlopez.com
http://twitter.com/ajlopez

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We"ve been building a new tool called Penrose, which takes a big step toward automatically visualizing mathematics.
https://twitter.com/hypotext/status/1268218080993386497
https://penrose.ink/siggraph20.html

Medieval maths! This table was written around 1110 at Thorney Abbey, Cambridgeshire. It helps you multiply fractions from 1/8 to 1/2304, by integers from 1 to 10000.
https://twitter.com/Seb_Falk/status/1270999728663277569

Ranks of Elliptic Curves
https://math.berkeley.edu/~molsson/KConrad-ranks.pdf

In Mathematics, It Often Takes a Good Map to Find Answers
https://www.quantamagazine.org/in-math-it-often-takes-a-good-map-to-find-answers-20200601/

In a Single Measure, Invariants Capture the Essence of Math Objects
https://www.quantamagazine.org/math-invariants-helped-lisa-piccirillo-solve-conway-knot-problem-20200602/

The "Useless" Perspective That Transformed Mathematics
https://www.quantamagazine.org/the-useless-perspective-that-transformed-mathematics-20200609/

Topological Logic - a rod through one hole of a double torus can pass through both with some careful stretching of the surface.
https://twitter.com/mathemaniac/status/1270680150506496003

How can you add something with period 6 and something with period 20 to create something with 7-fold symmetry?
https://twitter.com/AlgebraFact/status/1271037088180383745

Nos leemos!

Angel "Java" Lopez
http://www.ajlopez.com
https://twitter.com/ajlopez