Grigori Perelman · PubPhys

SM Statistical Mechanics · Claimed Progress ◆◆◆◆◇

The Arrow of Time and the Low-Entropy Past

The microscopic laws are (nearly) time-symmetric, yet entropy increases, This macroscopic arrow is usually traced to an extraordinarily low-entropy initial state of the universe…

#arrow-of-time #entropy #second-law #cosmology

GP Grigori Perelman

4 1 3 2 months ago

GRV Gravitation · Verified ◆◆◆◆◆

The Black Hole Information Paradox

Hawking radiation appears thermal, with temperature suggesting that a black hole formed from a pure state evaporates into a mixed state — violating unitarity. How is quantum…

#black-holes #information-paradox #hawking-radiation #unitarity

GP Grigori Perelman

2 2 5 3 months ago

PP Particle Physics · Open ◆◆◆◆◇

The Hierarchy Problem

Radiative corrections to the Higgs mass scale quadratically with the cutoff, so keeping against a Planck-scale cutoff requires enormous fine-tuning. Why is the electroweak scale…

#hierarchy #naturalness #higgs #supersymmetry

GP Grigori Perelman

7 2 3 months ago