Welcome to Tensors & Quarks
Exploring the cosmos of Physics & the depths of Machine Learning.
Latest Posts
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The Semiclassical Death of Warp Bubbles
Introduction: From Sci-Fi to Semi-Classical Reality
The dream of faster-than-light travel has long danced on the edge of science and imagination. Since Miguel Alcubierre first proposed a warp drive metric in 1994—a solution to Einstein’s field equations that allows a spaceship to “surf” through spacetime by contracting space in front of it and expanding it behind—scientists have speculated whether such a phenomenon could ever be physically realized.
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How AlexNet Lit the Spark and ResNet Fanned the Flames
In the ever-evolving landscape of deep learning, certain architectures have defined turning points in how neural networks are designed, trained, and understood. Among these, AlexNet and ResNet stand out as monumental contributions that shifted the paradigm of computer vision and image classification. Though separated by just three years, these two architectures reflect fundamentally different eras of deep learning—AlexNet laid the groundwork for deep convolutional networks, while ResNet solved the pressing problems that deeper architectures introduced.
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Black Hole Meets Neutron Star. Nothing Happens. Everything Changes
Introduction: When Gravity Speaks and Light Doesn’t
Astronomy entered a new era in 2017 when scientists witnessed the first ever multi-messenger event: GW170817. It was a neutron star collision that didn’t just ripple space-time but also burst forth in light—gamma rays, optical waves, X-rays, and more. Since then, the race has been on to catch more of these cosmic spectacles. But what happens when nature offers only silence?
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What happens to time when your universe can move through another?
Introduction: A Universe That Moves, and Time That Bends
Time travel is a fascinating concept — the stuff of science fiction and countless philosophical puzzles. But sometimes, the idea creeps into legitimate physics. Not as a machine or paradox, but as a byproduct of how we define time and causality in the first place. The paper Back to the Future: Causality on a Moving Braneworld ventures into this territory, asking what happens to causality — the idea that cause comes before effect — when our entire universe isn’t stationary but moves through a higher-dimensional space.
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Can We See the Shape of the Universe?
1. Introduction
What is the shape of the universe? Is it infinite or finite but unbounded, like a video game world that wraps around on itself? While general relativity has given us profound insights into the local curvature of spacetime, it leaves unanswered the question of the universe’s global shape. In her 2001 paper, Topology and the Cosmic Microwave Background, Janna Levin explores how cosmology and topology intersect—how the universe’s large-scale connectivity might be imprinted in the faint glow of the early universe: the cosmic microwave background (CMB). This paper not only bridges mathematics and astrophysics but also pushes the philosophical boundary between what can be known and what must remain an assumption.
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