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No Hair Theorem

All articles tagged with #no hair theorem

science5 days ago•8 min saved

Star S301’s Race Around Sgr A* Could Reveal Black Hole Spin and Test Relativity

Astronomers using the GRAVITY+ instrument have tracked star S301 in an ultra-tight, 8.7-year orbit around the Milky Way’s supermassive black hole Sgr A*, reaching peak speeds over 25,000 km/s (about 15,500 miles/s, ~8% of light speed). The extreme motion near pericenter exposes frame-dragging and spacetime curvature, offering a path to measure Sgr A*’s spin and test the no-hair theorem of black holes, with continued observations through 2031 and future ELT instruments like MICADO.

via ScienceAlert|

#black-hole #frame-dragging #no-hair-theorem

science2 years ago•3 min saved

Gravitational Wave Observations Confirm No-Hair Theorem in Black Hole Merger

Researchers have used gravitational wave observations to verify the no-hair theorem, which states that black holes can be described by just their mass and angular momentum. By analyzing data from the GW190521 binary black hole merger event, the team discovered a second, weaker quasi-normal mode that had been missed in earlier analyses. The findings are consistent with the predictions of general relativity, confirming that black holes adhere to the no-hair theorem.

via Phys.org|

#black-holes #general-relativity #gravitational-waves

astronomy2 years ago•3 min saved

Unveiling the Complexity of Black Holes: Paired Entities Pulled by Cosmic Expansion

A new paper suggests that black holes might not be as simple as previously thought. According to the metaphorically-named 'no-hair theorem', all the information about a black hole can be described by its mass, angular momentum, and charge. However, researchers have identified scenarios where black holes could become 'hairy', violating this theorem. By considering binary black hole systems and the repulsion between charged black holes, they propose the existence of stable equilibrium and multiple horizons. This analysis also suggests that a cosmological constant, similar to dark energy, could prevent certain black holes from merging. While these findings challenge current theorems, further research is needed to test their validity.

via ScienceAlert|

#astronomy #binary-systems #black-holes