A new theory links gravity to quantum entropy and introduces the G-field, possibly explaining dark matter and cosmic expansion. In a recent study published in Physical Review D, Professor Ginestra Bianconi, a Professor of Applied Mathematics at Queen Mary University of London, presents a groundbr
Dr. Richard Lieu, a physics professor at The University of Alabama in Huntsville (UAH), a part of The University of Alabama System, has published a paper in the journal Classical and Quantum Gravity that proposes a universe built on steps of multiple singularities rather than the Big Bang alone to account for the expansion of the cosmos.
The new model forgoes the need for either dark matter or dark energy as explanations for the universe’s acceleration and how structures like galaxies are generated.
The researcher’s work builds on an earlier model hypothesizing that gravity can exist without mass.
Posted in cosmology, quantum physics | Leave a Comment on Scientists claim to find ‘first observational evidence supporting string theory,’ which could finally reveal the nature of dark energy
Physicists have proposed a new model of space-time that may provide the ‘first observational evidence supporting string theory,’ a new preprint suggests.
What if your mind is shaping the world around you in ways you can’t see… or even imagine?
Evolving cosmological constant.
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The Standard Model of Cosmology has reigned supreme for decades, confirmed over and over again. But chinks in the armour have been developing, such as the Hubble Tension. Now, however, a new result threatens to completely upend our view of the Universe — we no longer even know how it will end.
Written & presented by Prof. David Kipping.
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What do smart bandages, ocean-powered sensors, and quantum biology have in common? They’re all part of Dr. Leonard Tender’s work at DARPA. On the latest episode of Voices from DARPA, he discusses his fascinating research in the Biological Technologies Office and how these innovations are shaping the future of national security.
Quantum systems are known to be prone to dissipation, a process that entails the irreversible loss of energy and that is typically linked to decoherence. Decoherence, or the loss of coherence, occurs when interactions between a quantum system and its environment cause a loss of coherence, which is ultimately what allows quantum systems to exist in a superposition of states.
While dissipation is generally viewed as a source of decoherence in quantum systems, researchers at Tsinghua University recently showed that it could also be leveraged to study strongly correlated quantum matter.
Their paper, published in Nature Physics, introduces a new method to probe intrinsic quantum many-body correlations and demonstrates its potential for studying the dissipative dynamics in strongly correlated one-dimensional (1D) quantum gases.
For the better part of a century, the quantum objects known as quasiparticles have been all dressed up with nowhere to go. But that may change, now that a Yale-led team of physicists has shown it is possible to exert a greater level of control over at least one type of quasiparticle.
The discovery upends decades of fundamental science and may have wide applications for quantum-related research in the years ahead.
A quasiparticle is an “emergent” quantum object—a central, core particle surrounded by other particles that, together, demonstrate properties not found in each individual component. Quasiparticles have become the central conceptual picture by which scientists try to understand interacting quantum systems, including those that may be used in computing, sensors, and other devices.
Teleology is the idea that some processes in nature are directed toward a goal or an end. Today, it is commonly asserted that teleology is a remnant of antiquated ways of thinking about causation, and that it is not compatible with modern science, because it is fundamentally untestable.
In my opinion, such claims fail to take modern physics into account. Quantum theory involves a complex notion of causation, and it can naturally incorporate final conditions. However, to work with final conditions that are not imposed by external agents, we need to move into the realm of quantum cosmology, in which the whole universe is treated as a quantum system.
With this issue in mind, I studied final conditions in quantum cosmology. I found that cosmologies with such conditions generally predict a universe with accelerated expansion. Cosmic acceleration is a well-established fact, and also one of the most puzzling features of modern cosmology.
Research teams from USTC have realized a high-performance single-photon source with an efficiency beyond the scalable linear optical quantum computing loss tolerance threshold for the first time. Led by Prof. Pan Jianwei, Lu Chaoyang and Hu Yongheng, the study was published in Nature Photonics on February 28.
Photons, as important carriers for quantum information processing, have the advantages of fast speed and strong resistance to environmental interference. However, for scalable linear optical quantum computing to be feasible, apart from the challenges like photons being easily lost, the efficiency of a single-photon source must exceed the tricky threshold of 2/3. Previous studies had never broken through this threshold, a key obstacle restricting the development of optical quantum computing.
To overcome this challenge, the research teams have developed a tunable open optical microcavity, achieving precise coupling of quantum dots and microcavities in both resonance frequency and spatial positioning. The microcavity solved the detuning problem of traditional fixed microcavities.
