A new paper finds that combining photovoltaics with crop farming can result in revenue gains over the life of a PV system at a diverse range of locations in the United Kingdom. Researcher Aritra Ghosh tells pv magazine that the benefits of agrivoltaics are ‘multifaceted.’
The 56-qubit H2-1 computer has broken the previous record in the ‘quantum supremacy’ benchmark first set by Google in 2019.
The call and text message records from mid-to-late 2022 of tens of millions of AT&T cellphone customers and many non-AT&T customers were exposed in a massive data breach, the telecom company revealed Friday.
AT&T said the compromised data includes the telephone numbers of “nearly all” of its cellular customers and the customers of wireless providers that use its network between May 1, 2022 and October 31, 2022.
The stolen logs also contain a record of every number AT&T customers called or texted – including customers of other wireless networks – the number of times they interacted, and the call duration.
Over the last year, he has also ramped up work on what will happen if he gets there.
Mr. Musk, 53, has directed SpaceX employees to drill into the design and details of a Martian city, according to five people with knowledge of the efforts and documents viewed by The New York Times. One team is drawing up plans for small dome habitats, including the materials that could be used to build them. Another is working on spacesuits to combat Mars’s hostile environment, while a medical team is researching whether humans can have children there. Mr. Musk has volunteered his sperm to help seed a colony, two people familiar with his comments said.
Oxford Ionics reported that the company’s newest chips can provide over twice the performance of previous records.
You won’t have a job, but you will beat illness, boost your IQ and cheat death, says a futurologist.
Numerous open questions in gravity theory become apparent from observations in cosmology, such as the cosmic microwave background radiation [1, 2, 3, 4, 5, 6], the large scale structure [7, 8], gravitational waves [9, 10] and supernovae [11]. In order to describe these observations, one needs to study the evolution of both the universe as a whole, modeled by a homogeneous and isotropic background geometry and matter distribution, as well as perturbations of this background. A thorough understanding of such cosmological perturbations and their dynamics imposed by the gravitational interaction is therefore an important necessity for describing and explaining the modern observations in cosmology.
Cosmological perturbations in gravity have been studied for a long time, starting with the case of (pseudo-)Riemannian spacetime geometry, which is employed by the standard formulation of general relativity and the most well-known class of its extensions, in which the gravitational interaction is attributed to the curvature of the metric-compatible, torsion-free Levi-Civita connection [,13,14,15]. This task is significantly simplified by the fact by understanding how perturbations transform under gauge transformations, i.e., infinitesimal diffeomorphisms which retain the nature of the spacetime geometry as a small perturbation of a cosmologically symmetric background. From these gauge transformations, one can derive a set of gauge-invariant perturbation variables, which describe the physical information contained in the metric perturbations as well as the perturbations of the matter variables, so that they become independent of the arbitrary gauge choice. The resulting gauge-invariant perturbation theory is one of the cornerstones of modern cosmology [16,17,18,19].
Despite its overwhelming success in describing observations from laboratory scales up to galactic scales, general relativity is challenged by the aforementioned open questions, as well as the open question how it can be reconciled with quantum theory. This situation motivates the study of modified gravity theories [20]. While numerous theories depart from the standard formulation of general relativity in terms of the curvature of the Levi-Civita connection of a Riemannian spacetime, also other formulations in terms of the torsion or nonmetricity of a flat connection exist and can be used as potential starting points for the construction of modified gravity theories [21, 22]. Focusing on general relativity alone, one finds that these formulations are equivalent in the sense that they lead to field equations which possess the same solutions for the metric irrespective of the geometric properties of the connection under consideration…
Once upon a time, Earth was barren. Everything changed when, somehow, out of the chemistry available early in our planet’s history, something started squirming – processing available matter to survive, to breed, to thrive.
What that something was, and when it first squirmed, have been burning questions that have puzzled humanity probably for as long as we’ve been able to ask “what am I?”
Now, a new study has found some answers – and life emerged surprisingly early.
The tachyon, a hypothetical, faster-than-light particle previously thought unworkable with relativity, may have some tricks up its sleeve.
Through analysis of gene families that were duplicated before the last universal common ancestor (LUCA), we estimate the date of the LUCA at approximately 4.2 billion years ago. Our reconstruction of the genome of the LUCA contains around 2,500 protein-encoding genes across 2.5 megabases, and we suggest that the LUCA was a complex anaerobic acetogen that lived within a pre-existing ecosystem.
