Um novo estudo sugere que o colapso de estrelas massivas pode originar gravastars, desafiando a visão tradicional de que esse processo resulta em buracos negros. Essa descoberta pode transformar a compreensão sobre o destino final das estrelas e os fenômenos do colapso gravitacional.
🔗 https://omniletters.com/gravastars-estrelas-colapso/
#gravastar #estrelas #buracosnegros #astrofisica #colapsogravitacional
Regular black holes and horizonless black hole mimickers offer mathematically consistent alternatives to address the challenges posed by standard black holes. However, the formation mechanism of these alternative objects is still largely unclear and constitutes a significant open problem since understanding their dynamical formation represents a first step to assess their existence. We here investigate, for the first time and without invoking higher-curvature corrections, the dynamical formation of a well-known horizonless black hole mimicker, namely, a gravastar. More specifically, starting from the collapse of a uniform dust sphere as in the case of the Oppenheimer-Snyder collapse, we demonstrate that, under fine-tuned conditions, a gravastar can form from the nucleation and expansion of a de Sitter region with initial zero size at the center of the collapsing sphere. Furthermore, the de Sitter expansion naturally slows down near the Schwarzschild radius, where it meets the collapsing dust surface and gives rise to a static equilibrium. Interestingly, we also find a maximum initial compactness of the collapsing star of $\mathcal{C}= 3/8$, above which the collapse to a black hole is inevitable.
Gravastar Announced as a Sci-Fi Fantasy RPG Developed for Over 10 Years
https://fed.brid.gy/r/https://noisypixel.net/gravastar-announced-sci-fi-fantasy-rpg/
#MercuryK1 is an excellent keyboard, but can we all please go and bother #Gravastar for some UK layout keycaps so I don't look for punctuation marks for 30 minutes, before giving up and using Win+Space?
#Gravastar introduced a web-based control panel for your #MercuryM2 mouse! You can check it out now! If you find yourself missing the old software, I updated the article with download links.
https://notenoughtech.com/review/the-holey-gravastar-mercury-m2/
It's been 3 weeks since I reviewed #GravaStar #MercuryM1 keyboard. It looks just as fantastic as before, but my typing speed improved by 30% too. I'm writing about the latest Sonoff release and I'm still in love with how "pebble-y" it sounds as I type.
You should check out my review if you are in the market for a compact keyboard that looks out of this world!
Omni Letters - Brasil
Daniel Fischer
Games Japan
Noisy Pixel - Gaming, Etc. [Unofficial]
Pickr
Mat (notenoughtech)
