What is meant by a unitary transformation?

what is meant by a unitary transformation? physically or mahematically

08 September 2016 7,567 9 View

Vacuum expectation value of Higgs?

What is the physical meaning of Vacuum expectation value. If we have a 2D plot for potential V(\phi) for the scalar field for negative mass square, then which distance is vev in that plot?

08 September 2016 3,300 4 View

How many goldstone bosons appear as a spntaneous symmetry breaking in process of higgs mechanism?

07 August 2016 1,188 4 View

Why do we add charge conjugation in Majorana mass term in the Lagrangian for the case of Type II seesaw?

What is that Charge conjugate in Majorana mass term. Is that a matrix or it works as an operator. Please someone explain me.

07 August 2016 2,875 1 View

The difference between Dirac and Majorana particles and why only the neutrino could be a Majorana fermion?

07 August 2016 6,410 6 View

Why can't we add a majorana mass type term in general Lagrangian?

07 August 2016 3,677 1 View

I also need a good article to understand "Type I seesaw mechanism" in HEP. Would someone please help me?

Please explain me that we say that seesaw mechanism is a way to measure the neutrino masses. The main idea is to introduce dimension-five operator(attached below). How can I understand the...

02 March 2016 9,756 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

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

After a reference from Int J Body Compos Res, can any body help?

Hi, I am after the reference below, my library says it cannot obtain a copy either locally or internationally, any help appreciated! Chris Wang ZM, Heshka S, Wielopolski L, Pi-Sunyer FX, Pierson...

03 March 2021 6,193 1 View

Irradiation data for JAPAN?

Hi, Could you help me to get the latest (2019, 2020) solar resource data for a particular site in JAPAN? PV GIS and NSRDB data are not in reach to JAPAN, I'm looking for some other database for...

03 March 2021 961 3 View

Waters 2707 HPLC autosampler problem?

I am using a 2707 waters HPLC device. When I try to inject a sample, it says missing plate or rack. I changed the needle and calibrated its position but I still get the same problem. I even get...

02 March 2021 1,408 1 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

Does anyone know HRM channel in a 2 plex QIAGEN Rotor- Gene Q qPCR can be used as a separate channel?

I am going to have 3 different probes in my qPCR work that I am going to do. But I realized that the machine we have in the lab is a Rotor-Gene Q 2plex HRM Platform, saying it has green, yellow,...

01 March 2021 8,544 1 View

I have designed reflectarray element and feeding it though Horn Antenna on HFSS. After full wave simulation, I am not getting desired results?

I have designed reflectarray element to generate OAM beams at 5.8GHz and feeding it though Horn Antenna on HFSS. After full wave simulation, i am not getting desired results i.e Radiation pattern...

01 March 2021 9,701 5 View