Various large-scale astrophysical research projects are set to take place over the next decade, several of which are so-called cosmic microwave background (CMB) experiments. These are large-scale scientific efforts aimed at detecting and studying CMB radiation, which is essentially thermal radiation originating from the early universe.
Evidence for potential dark matter objects has been detected using pulsars, which are neutron stars emitting regular beams of radio waves.
These beams were analyzed by Professor John LoSecco, revealing variations and delays that indicate the presence of unseen mass, likely dark matter. LoSecco utilized data from the PPTA2 survey, involving precise measurements from several radio telescopes. The study found around a dozen instances where dark matter likely influenced pulsar signals. This research not only helps in understanding dark matter but also improves pulsar timing data for other astronomical studies.
Detecting Dark Matter With Pulsars
Scientists cannot observe dark matter directly, so to “see” it, they look for signals that it has interacted with other matter by creating a visible photon. However, signals from dark matter are incredibly weak. If scientists can make a particle detector more receptive to these signals, they can increase the likelihood of discovery and decrease the time to get there. One way to do this is to stimulate the emission of photons.
Posted in cosmology
There’s more than one way for a star to die. Some go with a whimper, and some go with a very, very big bang.
By Phil Plait
Very soon now, possibly in a few days, though more likely in the next few weeks, a new star will appear in our sky—except it’s really an old star. Called T Coronae Borealis (or T Cor Bor), it’s a binary system composed of a huge red giant star and a tiny white dwarf. Though small, white dwarfs are vicious: They pack much of a solar-type star’s mass into an approximately Earth-sized sphere. This makes them terrifically dense and hot, and they possess a fierce gravitational attraction.
Explore the mind-bending realms of the cosmos in our latest video! 🌌 From the Big Bang’s inception to the rapid expansion driven by dark energy, we’ll delve into how our universe grows endlessly. Discover the possibility of multiple universes, each with unique physical laws, and the role of black holes in potentially creating new universes. We’ll also uncover the cosmic microwave background’s secrets, revealing clues about early universe collisions. Embark on a journey through space and time, contemplating the infinite and the mysteries that stretch the boundaries of human understanding.
#CosmicMysteries #MultiverseTheory #BigBang #DarkEnergy #BlackHoles.
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OUTLINE:
00:00:00 Into the Unknown.
00:01:01 A Multiverse of Possibilities.
00:03:20 Gateways to New Universes?
00:05:36 Echoes of a Multiverse?
00:06:35 A Universe of Possibilities.
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Physicists say that they might have solved a long standing problem: How do supermassive black holes manage to merge to larger ones. Their idea: dark matter gets the job done. Or does it? I’ve had a look.
Paper: https://journals.aps.org/prl/abstract…
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New theoretical research finds that it’s impossible to form a black hole with the energy of light particles alone, poking a hole in Einstein’s theory of general relativity.
When two black holes collide, space and time shake and energy spreads out like ripples in a pond. These gravitational waves, predicted by Einstein in 1916, were observed for the first time by the Laser Interferometer Gravitational-Wave Observatory (LIGO) telescope in September 2015.
Innovative techniques being developed to detect gravitational waves beyond the current capabilities of laser interferometers like LIGO and Virgo.
That rare bright spot looks set to become brighter.
All of the more than 100 gravitational-wave events spotted so far have been just a tiny sample of what physicists think is out there. The window opened by LIGO and Virgo was rather narrow, limited mostly to frequencies in the range 100–1,000 hertz. As pairs of heavy stars or black holes slowly spiral towards each other, over millions of years, they produce gravitational waves of slowly increasing frequency, until, in the final moments before the objects collide, the waves ripple into this detectable range. But this is only one of many kinds of phenomenon that are expected to produce gravitational waves.
LIGO and Virgo are laser interferometers: they work by detecting small differences in travel time for lasers fired along perpendicular arms, each a few kilometres long. The arms expand and contract by minuscule amounts as gravitational waves wash over them. Researchers are now working on several next-generation LIGO-type observatories, both on Earth and, in space, the Laser Interferometer Space Antenna; some have even proposed building one on the Moon1. Some of these could be sensitive to gravitational waves at frequencies as low as 1 Hz.
Dark energy remains among the greatest puzzles in our understanding of the cosmos. In the standard model of cosmology called the Lambda-CDM, it is accounted for by adding a cosmological constant term in Einstein’s field equation first introduced by Einstein himself. This constant is very small and positive and lacks a complete theoretical understanding of why it has such a tiny value. Moreover, dark energy has some peculiar features, such as negative pressure and does not dilute with cosmic expansion, which makes at least some of us uncomfortable.
