User PhotonBoom

27 votes

Accepted

What is the actual meaning of the density operator?

answered Jan 8, 2015 at 12:15

25 votes

Accepted

What is charge actually? How to define it?

electromagnetism electrostatics charge definition

answered Apr 3, 2014 at 16:09

22 votes

Accepted

Evidence of why the Standard Model is a successful theory of particle physics

experimental-physics standard-model

answered Jul 28, 2014 at 0:48

19 votes

How come "smaller, weaker" particles are more massive (have higher energies)?

particle-physics standard-model

answered Jan 6, 2015 at 13:36

18 votes

Accepted

Why collide a moving particle with a particle at rest, rather than two moving particles?

special-relativity kinematics reference-frames collision particle-accelerators

answered Mar 24, 2015 at 12:25

18 votes

Accepted

Can one obtain free energy from the vacuum?

energy vacuum particle-physics

answered Mar 31, 2014 at 12:13

16 votes

Accepted

Could any object have zero mass?

special-relativity mass-energy

answered Apr 2, 2015 at 17:59

15 votes

If I drop a leaf twice from the height of a tree in a completely controlled environment, will the trajectory in each case be the same?

quantum-mechanics heisenberg-uncertainty-principle measurement-problem determinism

answered Apr 3, 2014 at 19:15

11 votes

Accepted

What is antimatter?

antimatter

answered Jan 3, 2015 at 3:01

11 votes

Accepted

Unfurling a toilet paper roll in the ISS

rotational-dynamics

answered Jan 4, 2015 at 0:48

9 votes

Why does blowing on hot coffee cool it down?

thermodynamics fluid-dynamics energy

answered Jul 20, 2014 at 0:10

9 votes

Accepted

Understanding the Quantum Vacuum State

quantum-mechanics operators many-body

answered Mar 27, 2015 at 18:26

7 votes

Why does the speed of light totally prevent instantaneous information exchange?

special-relativity faster-than-light causality information

answered Jan 6, 2015 at 23:57

7 votes

What is the basis of gauge theory?

gauge-theory gauge-symmetry

answered Jul 17, 2014 at 21:34

7 votes

Accepted

Problem with Maxwell's theory

classical-electrodynamics maxwell-equations singularities

answered Dec 4, 2014 at 20:51

7 votes

How can one model quantum walks in photosynthesis?

quantum-mechanics quantum-information superposition biophysics open-quantum-systems

answered Dec 12, 2014 at 15:25

7 votes

Accepted

Can we observe an edge of the universe?

universe observable-universe

answered Mar 30, 2014 at 17:10

6 votes

Is the graviton hypothetical?

gravity particle-physics quantum-gravity gravitational-waves elementary-particles

answered Jun 14, 2014 at 11:23

6 votes

Accepted

Free parameters in the Standard Model

particle-physics experimental-physics standard-model physical-constants

answered Mar 28, 2015 at 17:07

6 votes

How do electromagnetic waves travel in a vacuum?

visible-light electromagnetic-radiation vacuum aether

answered Jan 4, 2015 at 21:33

5 votes

Feynman-Stueckelberg interpretation

antimatter feynman-diagrams dirac-equation

answered Dec 22, 2014 at 15:38

5 votes

Why is the Luminiferous aether theory wrong?

electromagnetism electromagnetic-radiation speed-of-light physical-constants aether

answered Dec 26, 2014 at 17:00

5 votes

Accepted

Possibility of simulating quantum physics and relativity

quantum-mechanics simulations relativity computational-physics

answered Jan 2, 2015 at 20:38

5 votes

Why does wavelength affect diffraction?

waves diffraction wavelength

answered Jul 10, 2014 at 12:07

5 votes

How are anti-matter atoms created?

experimental-physics atoms antimatter

answered Apr 1, 2014 at 10:53

4 votes

Accepted

Is speed of light ( Sun-to-Earth ) related to the movement speed of solar system?

special-relativity speed-of-light reference-frames observers

answered Mar 31, 2014 at 14:20

4 votes

Why should a (physical) principle be applicable to different systems in different positions in space and time?

reference-frames covariance foundations

answered Jul 7, 2014 at 17:24

4 votes

Accepted

Are gravitons bound by the event horizon?

gravity black-holes event-horizon gravitational-waves virtual-particles

answered Apr 6, 2014 at 21:49

4 votes

Chasing a photon

special-relativity speed-of-light velocity relativity

answered May 6, 2014 at 7:15

4 votes

How does a spinning electron produce a magnetic field?

electromagnetism angular-momentum quantum-spin electrons magnetic-moment

answered May 6, 2014 at 21:23

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128 Answers

What is the actual meaning of the density operator?

What is charge actually? How to define it?

Evidence of why the Standard Model is a successful theory of particle physics

How come "smaller, weaker" particles are more massive (have higher energies)?

Why collide a moving particle with a particle at rest, rather than two moving particles?

Can one obtain free energy from the vacuum?

Could any object have zero mass?

If I drop a leaf twice from the height of a tree in a completely controlled environment, will the trajectory in each case be the same?

What is antimatter?

Unfurling a toilet paper roll in the ISS

Why does blowing on hot coffee cool it down?

Understanding the Quantum Vacuum State

Why does the speed of light totally prevent instantaneous information exchange?

What is the basis of gauge theory?

Problem with Maxwell's theory

How can one model quantum walks in photosynthesis?

Can we observe an edge of the universe?

Is the graviton hypothetical?

Free parameters in the Standard Model

How do electromagnetic waves travel in a vacuum?

Feynman-Stueckelberg interpretation

Why is the Luminiferous aether theory wrong?

Possibility of simulating quantum physics and relativity

Why does wavelength affect diffraction?

How are anti-matter atoms created?

Is speed of light ( Sun-to-Earth ) related to the movement speed of solar system?

Why should a (physical) principle be applicable to different systems in different positions in space and time?

Are gravitons bound by the event horizon?

Chasing a photon

How does a spinning electron produce a magnetic field?