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Physics Forums Featured Threads

Hardy's approach to quantum gravity and QM interpretation
Work in quantum foundations is partly considered important because of the hope that the way we think about QM may point to a road to quantum gravity. Lucien Hardy, who is wellknown in quantum foundations for his reformulation of QM in terms of five "reasonable" axioms, is one of the people who try to make this really tangible... 
The Rise of Incentivized Competitions for Humanity
The recent rise of incentivized competitions for humanity has prompted me to create this thread, to tell PFers what's out there and to share my meager experienced in "almost" entering one. The largest and arguably most influential one has been the XPRIZE organization which finds sponsors and puts out many competitions to solve some of our worst problems. Its a competitive game with many teams worldwide... 
Is a trip Alpha Centuri system feasible?
Can the journey be completed within the lifetime of a human adult? Assuming we have got around little problems like having an adequate form of propulsion, shielding from radiation, and avoiding deadly collisions with milligram sized dust particles. Let's say our engines can provide constant acceleration then deceleration at 1g. 
Does the Principle of Least Action Have a Physical Meaning?
I have found that some people say “yes, definitely”, and other days “no, definitely not”. Those who say “no” seem to regard PLA as merely a neat way of packaging the equations. Those who say “yes” seem to regard PLA as somehow fundamental. Is there a consensus among physicists that I am unaware of? If not, why not? What could the physical meaning of PLA even be? 
Swampland conjecture
The swampland conjecture is currently a very hot topic. Can someone explain, in simple terms, what exactly the swampland idea is? In particular, the conjecture states that the string landscape is surrounded by an even larger swampland of consistentlooking semiclassical effective field theories, which are actually inconsistent. What exactly does it mean that an effective theory is inconsistent? 
Intermediate Math Challenge  September 2018
Summer is coming and brings a new basic math challenge! Enjoy! For more advanced problems you can check our other basic level math challenge thread! 
Basic Math Challenge  September 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! 
Double blind peer review winners and losers
Double blind peer review is a process in which not only the author does not know the name of the reviewer (which is the standard practice), but also the reviewer does not know the name of the author (which is not a standard practice). What would happen if the scientific community suddenly decided to shift to the double blind review process? Who would be the winners? Who would be the losers? 
Analyzing the game of tennis
I am trying to analyze the game of tennis. I started very simply by analyzing just the ground strokes, ignoring the serve, and calculating the odds of winning a single point given the odds of returning each ground stroke. I got a surprising (to me) result showing that the player to goes first always has a lower probability of winning the point than the opponent... 
Cellphone Distraction in Classroom Can Lead to Lower Grades
This is something many of us instructors have to deal with, something that was never an issue when I was still in college. Students now come to class equipped with notebook laptop, tablets, and of course, the ubiquitous cellphones. Different instructors have different policy on the use of the electronics, ranging from an outright ban, to "I don't care if you use these during class session as long as you don't distract... 
The 2018 Fields Medal has been awarded...
The 2018 Fields Medal has been awarded to: Caucher Birkar, Alessio Figalli, Peter Scholze, Akshay Venkatesh. More inside... 
How much time should I study?
I'm having trouble in studying. I am studying full time from Monday to Monday but I just cannot get focused all the time, I realized that more than half of the time I'm sleepy or struggling to maintain my focus. I'm doing my degree in physics and I feel like I need to study full time, but I just can't do it, what should I do? 
Genoa Bridge Collapse  Engineering Perspectives
The dramatic collapse of a bridge in Italy with many fatalities has been the big item of news all over Europe. I just wonder if the qualified people here can throw any light not on the specifics which would be hard for them to know, but in general... 
Basic Math Challenge  August 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! 
Intermediate Math Challenge  August 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!
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