Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!
Physics Forums Featured Threads

Intermediate Math Challenge  July 2018
Summer is coming and brings a new intermediate math challenge! Enjoy! If you find the problems difficult to solve don't be disappointed! Just check our other basic level math challenge thread! 
What are the frontiers of cosmology research?
I have completed post grad in Physics and in the transition phase between post grad and Ph.D. I am interested in cosmology and also completed a post grad course on Astrophysics and Cosmology. Can anyone enlighten me about what are the current debates and active topics of research going on in Cosmology? 
No metastable type IIB de Sitter vacua
Take note of today's ObiedOoguriSpodyneikoVafa 18. Curious situation: After it had influenced much the development of the string theory community’s attention and almost all of its public media perception since 2003, after what must be thousands of followup publications, the argument of KKLT 03 for a large finite number of metastable de Sitter spacetime vacua of type IIB string theory... 
Contoversy about NASA's Asteroid Tracking
Nathan Myhrvold has raised questions about the accuracy of data NASA uses to track asteroids that may impact the earth. Myhrvold is a former Microsoft chief technologist and a guy with many diverse interests.
Specifically he has questioned the size information and how it was derived. This concerns the Neowise project which was derived from the Widefield Infrared Survey Explorer (WISE) project... 
New perspectives on Mtheory
"By analyzing supertorsion and brane supercocycles, we derive a new duality in Mtheory, which takes the form of a higher version of Tduality in string theory. This involves a new topology change mechanism abelianizing the 3sphere associated with the Cfield topology to the 517torus associated with exceptionalgeneralized supergeometry. Finally we explain parity symmetry in Mtheory"... 
Rigged Hilbert Spaces In Quantum Mechanics
In discussing stuff in another thread I used the standard Dirac notion expanding a state in position eigenvectors namely u> = ∫f(x) x>. By definition f(x) is the wavefunction. I omitted the dx which is my bad but the following question was posed which I think deserved a complete answer. It was also off at a tangent to the main threads topic so really required a separate thread... 
Hawaii's Kilauea Volcano Eruption Analysis Thread
Earth physics in action! Volcano erupts near homes in Hawaii causing evacuation of residents Fri 4 May 2018. Check this thread for the latest news, analysis, photos and video! 
Marsupial Loses Fear of Predators in 13 Generations
The Northern Quoll is endangered marsupial in Northern Australian. Its main problem, leading to its population decline, was eating the invasive and toxic cane toad. A population of them was introduced to a couple of islands (free of both cane toads and predators), where in 13 generations a large population was built up from which animals were reintroduced to the mainland. Problem is that the quolls lost their fear of predator scent... 
Scientists identify major safety issue with CRISPR
CRISPRCas9 technology provides scientists with an easy way to introduce targeted genetic changes to DNA and a number of different companies are looking at ways to use CRISPR to fix genetic diseases in humans. Two groups of researchers, however, have identified a major issue with CRISPR gene editing that has important implications for the safety of the technique... 
Intermediate Math Challenge  June 2018
Summer is coming and brings a new intermediate math challenge! Enjoy! If you find the problems difficult to solve don't be disappointed! Just check our other basic level math challenge thread! 
Methane and Organic Molecules on Mars
Curiosity has found seasonal occurrences of methane and some organic molecules on Mars. Both or possible indicators of carbon based life processes, but can have other nonbiological explanations. Methane has been intermittently found previously on Mars. However, lacking a continuous long term record the seasonal variations were not obvious. The seasonal variation could be explained by either biological... 
Basic Math Challenge  June 2018
Summer is coming and brings a new basic math challenge! Enjoy! For more advanced problems you can check our other intermediate level math challenge thread! 
Maxwell's equations and QFT
I have been wondering about the validity of Maxwell's equations in quantum physics. I looked in the internet and it seems from what I understood that: Maxwell's equations are valid for any situation, classical or quantum. In fact, maybe it holds more legitimacy than Schrodinger equation since it is a relativistic (invariant) set of equations... 
MiniBooNE results at 6.1 sigma
New evidence in the search for the 'sterile' neutrino. Can someone comment on this please. 
Challenges for artificial intelligence
Here I would like to see interesting challenges for artificial intelligence, which seem very hard for AI and yet in the spirit of what AI usually does. Here is my proposal: Let us feed the machine with a big sample (containing, say, a million numbers) of prime numbers and a big sample of nonprime numbers, without feeding it with a general definition of the prime number...
Page 3 of 19