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Recent research is probing the subtle dynamics of space and time from two complementary angles. Astrophysicist Jeremy Darling is developing a new astrometric method to detect the low‑frequency stochastic gravitational‑wave background by measuring minute apparent motions of distant quasars, building on earlier pulsar‑timing results from NANOGrav. Meanwhile, theoretical physicists at Goethe University Frankfurt and TU Wien have derived an exact formula describing how spacetime can organize into a crystal‑like critical state that, with a small energy input, may collapse into a microscopic black hole—a process that could have occurred in the early universe. Both studies highlight how tiny perturbations in the fabric of spacetime can produce observable or consequential phenomena, though one focuses on empirical detection of large‑scale wave effects and the other on a mathematical description of possible small‑scale collapse.
Darling's approach uses Gaia astrometric data on millions of quasars to search for three‑dimensional gravitational‑wave signatures beyond the line‑of‑sight effects measured by pulsar timing arrays.
The NANOGrav collaboration previously detected a stochastic gravitational‑wave background by observing timing variations in pulsars, but only captured wave motion in a single direction.
Researchers in Vienna and Frankfurt have formulated a precise mathematical description of a spacetime crystal that can undergo critical collapse into a microscopic black hole.
Critical collapse describes a transition where a regular spacetime structure becomes unstable and, with minimal added energy, can form a black hole, a mechanism relevant to primordial black‑hole formation.
Future Gaia data releases, extending observations by several years, are expected to improve the sensitivity of Darling's quasar‑based gravitational‑wave search.
It is a constant flux of low‑frequency gravitational waves generated by numerous supermassive black‑hole mergers throughout cosmic history, which subtly stretch and squeeze spacetime.
By precisely tracking the relative positions of quasar pairs, any tiny apparent motions induced by passing gravitational waves can be identified against Earth's own motion.
A spacetime crystal is a regular, lattice‑like configuration of spacetime that can arise during critical collapse; a small addition of energy can destabilize it, causing it to collapse into a microscopic black hole.
They represent a possible outcome of early‑universe critical states and could explain the existence of primordial black holes, offering insight into fundamental aspects of gravity and quantum physics.
Gaia provides high‑precision astrometric measurements of over a million quasars, supplying the data needed to detect the minute positional shifts that may signal gravitational‑wave effects.
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