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Ligo

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Cosmic Lens Could Rewrite a Massive Black-Hole Merger
space1 month ago

Cosmic Lens Could Rewrite a Massive Black-Hole Merger

A Space.com report notes researchers modeling the GW231123 gravitational-wave event suggest the unusually high inferred masses of the merging black holes could be an illusion caused by gravitational lensing. If a foreground object (roughly 190–850 solar masses) or a globular cluster lenses the signal, the true masses could be around 140 and 100 solar masses, avoiding the need for extreme spins. The lens’s exact nature remains unknown, and confirming lensing in future events will require more sensitive detectors; the team published their findings in Astrophysical Journal Letters.

via Space|
#black-holes#gravitational-lensing#gravitational-waves
Some Black Holes May Be Born From Earlier Black Hole Mergers
science3 months ago

Some Black Holes May Be Born From Earlier Black Hole Mergers

A new analysis of 155 binary black-hole mergers detected by LIGO/Virgo/KAGRA finds about 14% could be second-generation black holes formed from prior mergers, suggesting hierarchical mergers occur in dense stellar environments and can create unusually massive BHs in the 40+ solar-mass range, challenging simple stellar-collapse narratives and raising questions about their true origins.

via Gizmodo|
#black-holes#gravitational-waves#hierarchical-mergers
Direct waves from the loudest GW reveal a black hole’s horizon spin and gravity
science3 months ago

Direct waves from the loudest GW reveal a black hole’s horizon spin and gravity

The January 14, 2025 gravitational-wave event GW250114 was the loudest yet and contained a previously unread signal, the direct wave, emitted from just outside the remnant black hole’s horizon. By decoding this signal, researchers measured the horizon’s rotation frequency and surface gravity, finding results that match Kerr black-hole predictions and enabling horizon-focused tests of general relativity. This marks a new era of direct horizon metrology in gravitational-wave astronomy as detector sensitivity improves.

via Space Daily|
#black-holes#event-horizon#gravitational-waves
Loudest Black-Hole Merger Sheds Light on Event Horizons
science3 months ago

Loudest Black-Hole Merger Sheds Light on Event Horizons

Scientists analyzed GW250114—the loudest binary black-hole gravitational-wave signal observed to date, from a merger of two ~32-solar-mass black holes detected by LIGO, Virgo, and KAGRA. They identified a direct-waves component near the horizon and used it to measure the remnant black hole’s rotation and surface gravity, offering a new way to study event horizons and test general relativity in the extreme gravity regime.

via Yahoo|
#black-hole#event-horizon#general-relativity
Loudest Gravitational-Wave Burst Maps Black Hole Event Horizon
space3 months ago

Loudest Gravitational-Wave Burst Maps Black Hole Event Horizon

Researchers analyzing GW250114—the loudest binary black hole merger detected by LIGO, Virgo, and KAGRA—identified a new component called direct waves and used it to probe the remnant black hole's horizon, measuring its rotation frequency and surface gravity; the work, published in Nature, could enable future tests of general relativity and deepen our understanding of what happens at a black hole's edge.

via Space|
#black-holes#event-horizon#gravitational-waves
Direct-wave signal edges closer to unveiling a black hole’s event horizon
science3 months ago

Direct-wave signal edges closer to unveiling a black hole’s event horizon

A new, unusually clear gravitational-wave signal from a black-hole merger (GW250114) may carry the long-theorized direct-wave signature, offering a rare observational probe of the region near a black hole’s event horizon and enabling measurements of horizon rotation; if confirmed, this could open a new way to test general relativity and study near-horizon physics, though additional data and verification are needed.

via ScienceAlert|
#black-hole#direct-wave#event-horizon
Listening for Darkness: Could Gravitational Waves Reveal Dark Matter's Signature
space4 months ago

Listening for Darkness: Could Gravitational Waves Reveal Dark Matter's Signature

A new study proposes that dense dark-matter clouds around spinning black holes could imprint a detectable signal on gravitational waves produced by merging black holes. Researchers analyzed 28 LIGO/Virgo/KAGRA events and found one—GW190728—whose waveform may carry such an imprint, though not a definitive detection. If true, this could provide a new way to probe dark matter using upcoming gravitational-wave observations and detector improvements, with the results published in Physical Review Letters.

via Space|
#black-holes#dark-matter#gravitational-waves
LIGO Signals Point to Primordial Black Holes from the Big Bang
science6 months ago

LIGO Signals Point to Primordial Black Holes from the Big Bang

A LIGO detection involving an object lighter than a solar mass challenges standard stellar-black-hole formation, with researchers proposing a primordial black hole created in the early universe as the explanation. If confirmed, PBHs could account for dark matter, but further detections and next‑gen observatories like LISA and Cosmic Explorer are needed to build stronger evidence.

via Universe Today|
#cosmology#dark-matter#gravitational-waves
Crystal-Clear Gravitational Wave Confirms Einstein’s General Relativity
science7 months ago

Crystal-Clear Gravitational Wave Confirms Einstein’s General Relativity

A record-high-quality gravitational wave signal from a binary black hole merger (GW250114) produced multiple ringdown tones that independently yield the same black-hole mass and spin, providing a precise test of general relativity that passes, while underscoring the ongoing pursuit of quantum gravity and related gaps in our understanding.

via Universe Today|
#black-holes#general-relativity#gravitational-waves
Record-Breaking Gravitational Wave Reaffirms Einstein’s Relativity
science7 months ago

Record-Breaking Gravitational Wave Reaffirms Einstein’s Relativity

Scientists detected the loudest gravitational wave signal to date, GW250114, from a black-hole merger roughly 1.3 billion light-years away. The exceptionally clear signal lets researchers test Einstein’s general relativity with unprecedented precision, including the ringdown phase and multiple vibration tones, reinforcing GR and propelling future gravitational-wave astronomy with next‑generation detectors like LISA.

via The Daily Galaxy|
#black-holes#general-relativity#gravitational-waves
Record-Breaking Gravitational Wave Tests Gravity — and Finds Einstein Right Again
science7 months ago

Record-Breaking Gravitational Wave Tests Gravity — and Finds Einstein Right Again

Scientists detected GW250114, the loudest gravitational-wave event yet, from a pair of about 30-solar-mass black holes merging around 1.3 billion light-years away, recorded by LIGO with unprecedented clarity thanks to detector upgrades. The signal allowed detailed tests of general relativity, including two primary ringdown tones and a newly identified overtone, all matching GR predictions and Hawking’s area theorem. This strengthens GR’s validity at extreme gravity and points to future tests with next‑generation detectors (Einstein Telescope, Cosmic Explorer) and space-based LISA.

via Live Science|
#black-holes#general-relativity#gravitational-waves