What is emotion?

I am a physicist, so I don't know anything about emotions. How would you define them? I watched some TED and one guy said that men do not understand the difference between emotions and feelings....

06 July 2018 790 4 View

What is an event?

An event cannot be just (t,x,y,z). Because what is x for a swarm of bees?

03 April 2018 3,255 0 View

How to divide something into parts?

This is the basis of the analysis. One cannot say much about the whole. It is a standard operation procedure in the classical physics. L = L_1 + L_2 + L_int.. One uses addition, since the...

02 March 2018 536 1 View

Could someone point me to an attempt to write down the indistinguishability principle in the Lorentz covariant form?

31 December 2015 9,425 31 View

Could anybody suggest a book for a vacation read?

Something easy, mathematical and fascinating? Like swarms or braids or evolution. Or philosofical, or economical. Easy and interesting

06 July 2015 4,027 3 View

A new electron and an old muon?

All electrons are identical. Transposition of two of them multiplies the wave function by -1. All electrons in the Universe contribute equally to my body. That is not a problem. Let a new electron...

02 March 2015 4,636 2 View

Distribution of shortest distances for random points in 3D?

01 January 1970 9,607 9 View

Physics: Why do we describe light by referring to its wavelength, but microwaves and radar pulses by referring to their frequency?

In physics, the description of the properties of light generally refers to its wavelength (nm), while in the range of microwaves and radio waves we refer to the frequency of a signal (e.g. kHz or...

03 March 2021 1,682 3 View

Why are the velocities so high in my Boussinesq approximation Fluent simulation?

Hello, I have a mechanism where air rises due to convective flows. In this simulation, nothing is driving the air except this. I understand that the Boussinesq approximation only works for small...

02 March 2021 4,910 3 View

Why almost every element would be metallized in sufficiently high pressure and low temperature?

(This statement is from wikipedia, BTW). What is so special about metallic bond that is limiting high-P low-T state of a matter (as long as individual atoms exist, not white dwarf of neutron star...

02 March 2021 3,309 2 View

What is the density for pva electrospining?

I'm Juan Carlos, a high school student who is working with electropinning, I made an electropinning machine with a 21g needle and a 30kv high voltage source and the distance between my needle is...

28 February 2021 298 3 View

Should we reduce the standard unit of length to 0.31951540592 meter ?

The reasoning behind this question is to align the ratios of the proton potential in energy per charge to the speed of light in distance per time. As these two dimensions appear to be related,...

27 February 2021 947 7 View

How do you mesh a thin solid in Fluent?

Hello, I have used the shell function on SpaceClaim to create thin solids for the model I am studying. These are contained within an enclosure for my study. I chose this approach as it avoids the...

24 February 2021 8,856 3 View

No streamlines present in a small region inside a flow. This means exactly what?

No streamlines present means whether the flow is getting obstructed there and the velocity inside the region is zero? Or else, the fluid is trapped inside that region with a nonzero velocity?...

22 February 2021 5,249 10 View

How to solve the fatal error "the entire source was rejected" in MCNP?

Simple geometry was made having concentric cylinders bounded by a square region. The geometry has a reflective boundary. The source was defined at one point in the boundary and when it had been...

17 February 2021 4,364 3 View

How complex systems physics/statistical mechanics would be helpful for particle physics & Networking?

Recently, I've been selected for an ICTP program named Physics of Complex Systems. But, I have a keen interest in Particle Physics & Quantum networks. As statistical mechanics involved in...

11 February 2021 699 3 View

Applications of General Multiple Sums?

Does anyone know of applications of multiple sums of a sequence? I know of the Multiple Zeta values (which is a multiple sum of 1/N^s). This has multiple applications in quantum physics, QED,...

08 February 2021 8,047 12 View