What are latest results announced by Baryon Oscillation Spectroscopic Survey (BOSS) program?

A detailed 3D map of galaxies will shed information on the abundance of dark matter and dark energy. Are there any surprises?

03 August 2016 8,472 1 View

Can we discuss some simple examples of non-local interactions in extra dimensional models ?

Action at a distance is the simplest non-local interaction. But then in relativistic local field theories signals cannot travel at velocities more than the speed of light. This is taken into...

03 June 2015 2,081 14 View

Why was the Newtonian notion of "action at a distance" replaced by local interactions in Einstein's gravity?

In Newtonian notion force between to masses m1 and m2 separated by a distance d is simply G m1 m2/d^2. This is an example of a theory which accepts action at a distance. A second example is...

16 June 2014 9,984 40 View

How can we understand the nature of dark energy by examining the equation of state ?

Nature of dark energy is unknown. It is a form of energy causing expansion of universe. Satellite based experiments such as Planck has estimated that 68.3 % of total matter and energy is in the...

09 June 2014 2,275 27 View

How can one explain existence of acoustic peaks in cosmic microwave background anisotropies?

When delta T/T is plotted against angular separations between points we see several peaks in the plot. The first one is most prominent one is between l value 200-300, or in terms of angular scales...

16 May 2014 8,414 16 View

What are the production and decay channels of a 7 keV sterile neutrino?

A 7 keV sterile neutrino is a good candidate for warm dark matter. What are the feynman diagrams by which a 7 keV sterile neutrino can be produced? What are the decay channels? By which diagram...

10 April 2014 5,745 3 View

Gauge boson and fermion masses are proportional to VEVs of Higgs field: How is this phenomenon interpreted in terms of vacuum energy of scalars?

Vacuum expectation value (VEV) of the Higgs scalar is responsible for fermion masses and also masses of the W+ W- and Z gauge bosons. Does it mean that the Higgs particle can extract energy out...

27 March 2014 2,073 10 View

Why does the scale invariant density perturbation have spectral index one?

If density perturbations are scale invariant then the dependence should be more like k^0, where k is the wave number. Then why do we define that scale invariant perturbations has spectral index 1....

14 February 2014 4,754 2 View

What is the current status of the Proton Decay Problem ?

Proton lifetime is believed to be comparable to the lifetime of the universe. What is the most recent experimental numbers of proton lifetime ? What are the unified models which are ruled out by...

31 January 2014 4,846 3 View

What is radial density profile of dark matter in a typical spiral galaxy ?

Dark matter density should vary with radial distance to explain flat rotation curves seen in typical spiral galaxies like the milky way. What are the popular density profiles. How do they fit with...

15 January 2014 1,497 24 View

MD MOE RMSD

How to calculate the RMSD values for a MD simulation using MOE?

07 August 2021 0 0 View

MD MOE RMSD

How to calculate the RMSD values for a MD simulation using MOE?

07 August 2021 0 0 View

fatal error

When I tried to energy minimization my system, I got fatal error as below. Fatal error: Atomtype opls_116 not found Although I've already added this line: ; include water #include "oplsaa.ff/spc.itp" to [molecultype] directive in my topology.

16 June 2021 0 0 View

fatal error

When I tried to energy minimization my system, I got fatal error as below. Fatal error: Atomtype opls_116 not found Although I've already added this line: ; include water #include "oplsaa.ff/spc.itp" to [molecultype] directive in my topology.

16 June 2021 0 0 View

fatal error

When I tried to energy minimization my system, I got fatal error as below. Fatal error: Atomtype opls_116 not found Although I've already added this line: ; include water #include "oplsaa.ff/spc.itp" to [molecultype] directive in my topology.

16 June 2021 0 0 View

fatal error

When I tried to energy minimization my system, I got fatal error as below. Fatal error: Atomtype opls_116 not found Although I've already added this line: ; include water #include "oplsaa.ff/spc.itp" to [molecultype] directive in my topology.

16 June 2021 0 0 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

Could you recommend any books about Number Theory?

Beginner level books. High level books. Analytical Number Theory. Algebraic Number Theory. Combinatorical Number Theory. Books about partitions. Books about primes.

03 March 2021 7,174 5 View

Looking for Materials with high thermal expansion coefficient and high temperature resistance?

03 March 2021 8,272 1 View

Can we classify HV and LV lines based on line length?

I have dataset which shows the length of power lines. I need to classify the lines based on the line length. Is there a rule to classify the High voltage (HV) and low voltage (LV) lines based on...

03 March 2021 4,116 4 View