Recent content by Intesar

Thank you for your clarification.

I read(https://arxiv.org/pdf/1506.05669.pdf) which also exist at https://dash.harvard.edu/bitstream/handle/1/23474113/4596194.pdf?sequence=1&isAllowed=y There is also another interesting paper (https://arxiv.org/abs/1307.1432) in which the Standard Model spin-parity JP = 0+ hypothesis is...

Do we expect that parity and spin are conserved in this particular decay? If so can we use the spin and parity of the two photons to predict those for the H boson?

Can we predict the positive parity, and zero spin of the Higgs boson from the decay mode: 𝐻 → 𝛾𝛾?

Ya I just did that. It seems like I'm almost arriving at their expression but I can't seem to get the 2 first terms on the RHS. ##\frac{d}{dt}(a^2(\frac{1}{2}\dot{a}^2-ca)=ca(-2\dot{a}^2(1-\frac{1}{2}\frac{\dot{a}}{c})-a\ddot{a}(1-\frac{\dot{a}}{c}))## I am not sure how they arrived at that...

It seems like I'm almost arriving at their expression but I can't seem to get the first few terms on the RHS. ##\frac{d}{dt}(a^2(\frac{1}{2}\dot{a}^2-ca)=ca(-2\dot{a}^2(1-\frac{1}{2}\frac{\dot{a}}{c})-a\ddot{a}(1-\frac{\dot{a}}{c}))## I am not sure how they arrived at that. This is what I keep...

Ya I just did that. It seems like I'm almost arriving at their expression but I can't seem to get the 2 first terms on the RHS. ##\frac{d}{dt}(a^2(\frac{1}{2}\dot{a}^2-ca)=ca(-2\dot{a}^2(1-\frac{1}{2}\frac{\dot{a}}{c})-a\ddot{a}(1-\frac{\dot{a}}{c}))## I am not sure how they arrived at that...

So I tried calculating the derivative now and I'm getting most of the terms (LHS of the equation and the 3 right most terms of the RHS). This is what I have now...

##r=a(t)##

Thanks! Now so I tried differentiating the the first term on the RHS (##a^2(\frac{1}{2}\dot{a}^2-ca+h)##) with respect to time. This is what I got after differentiating this term: ##a\dot{a}^3+a^2\dot{a}\ddot{a}-3c{a}^2\dot{a}+\dot{h}a^2+2ha\dot{a}## It seems to be different from what they...

So I think I'm almost there, but now I'm having a problem with differentiating the the first term on the RHS (##a^2(\frac{1}{2}\dot{a}^2-ca+h)##) with respect to time. This is what I got after differentiating this term: ##a\dot{a}^3+a^2\dot{a}\ddot{a}-3c{a}^2\dot{a}+\dot{h}a^2+2ha\dot{a}## It...

How did you get ##a\dot{a}^3## for the first term on the RHS?

The derivative of ##2af'_2## wrt time is ##2\dot{a}f'_2+2a\dot{f'_2}##, but I'm not sure how to express ##\dot{f'_2}## in terms of ##\dot{a}##, ##c## and ##f'##.

##\dot{f_1}=f'_1(1-\frac{\dot{a}}{c})## and ##\dot{f_2}=f'_2(1+\frac{\dot{a}}{c})##

##\dot{f_1}=f'_1(x_1)\dot{x_1}##. I'm still unable to obtain their equation (equation 2). The last equation is what I attempted on doing.