C'est effectivement une mauvaise analogie. Il existe effectivement des solutions aux équations de la RG donnant un espace-temps courbe (ex: tenseur de Reimann non nul) mais localement sans matière/énergie (Tuv=0).

In general relativity there is this rubbish sheet analogy that spacetime is like a fabric, and it is rubbish

1/3 Le problème est que l'oeil fonctionne en vision "mésopique" (~1cd/m2) dans nos véhicules après le coucher du Soleil, sollicitant les cônes (photopique) ET les bâtonnets (scotopique). Or la différence de sensation lumineuse entre les deux est d'un facteur 2,5 environ, et ...

100 years ago today, Chuck Berry was born. Guitarist and songwriter who shaped rock and roll out of country, blues and R&B. Story songs, a double-stop guitar style, and a body of work that became the template.

BREAKING: Russia and the US are discussing building US data centers running on Russian nuclear power, per Putin's economic envoy Dmitriev. "We are discussing joint projects in the field of Russia-USA data centers, including with the use of our nuclear power plants," Dmitriev says. He says Putin and Trump are discussing a wide range of projects. "I think we will be announcing some important initiatives in the near future." "We have previously said that there is a very large synergistic effect between Russia and the United States in the Arctic, in the LNG sector, and in other energy projects," Dmitriev adds.

The midterms are about three and a half Zacharias away.

Remembering 𝗖𝗿𝗶𝘀𝘀 𝗢𝗹𝗶𝘃𝗮, the legendary Savatage guitarist, on the 33rd anniversary of his passing.

Breaking news: White House press secretary Katie Zacharia's exit comes amid deepening turmoil for White House as midterm elections loom. ft.trib.al/GzIqnoN

Now Home after an 8 day stay, and a 10 hour open heart surgery operation, called aortic valve replacement, exactly the same procedure I had done in 2013, at UCLA Ronald Reagan Medical Center, Westwood, LA. My doctor, Dr Richard Shemin, head, cardiac, and professor of UCLA, really took care of me with his remarkable staff. Each day as I move forward, I am getting my energy back. There is only love in my life. There are no mistakes. Everything is in its right place. Never believe that there is something wrong in your life. You are where you’re supposed to be. Going through those experiences that are necessary for you right now. When you become angry at yourself, because you don’t like the experiences that you are going through, you are hindering your growth. Rather be grateful, & thankful, for every experience that you’re going through. Even though it may appear to be terrible in your life, be thankful for this experience, for the experience is not what you think it is, in your finite mind. There is a greater purpose to it. All is well... G 🧡

Du calme. Il se produit ~400 TWh d'hydroélectricité au Canada dont 43 % au Québec. C'est tout le secteur canadien qui est visé par ce règlement. De plus, je ne serais aucunement surpris que ce soit un power trip du MPO et que le gvt recule.

Fun fact. A car-sized asteroid passed 1000 km above the Arctic this morning. Newly-discovered asteroid 8NIQ001 approached from the daytime sky. It wasn't discovered until after a close approach of ~1000 km above the Arctic.

Rock and Roll Hall of Famer Glenn Hughes is now resting at home following a 10-hour open-heart surgery bluesrockreview.com/2026/10/…