stephaneww
Senior Members
Content Count
355 
Joined

Last visited

Days Won
1
stephaneww last won the day on September 15 2019
stephaneww had the most liked content!
Community Reputation
18 NeutralAbout stephaneww

Rank
Atom
 Birthday 10/02/1968
Profile Information

Location
France

Favorite Area of Science
cosmology
Recent Profile Visitors

A connection between entropic gravity and the vacuum catastrophe ?
stephaneww replied to stephaneww's topic in Speculations
Hi Modred. About that : what do you think about this opinion please ? source : http://backreaction.blogspot.com/2019/09/thefivemostpromisingwaysto.html 
The solution of the Cosmological constant problem ?
stephaneww replied to stephaneww's topic in Speculations
ok (you omitted a c^2: [math]\rho_{\Lambda}=\frac{c^2 \Lambda}{8 \pi G_n}[/math] ) for the "quantum energy density of the vacuum" (B), if a temperature TB/m^3 = EB/kB/m^3 can be made to correspond, we have TB/m^3 = about 10^110 K/m^3. There would be no absolute zero due again to the fluctuations of the quantum vacuum. (E=kB T) for the quantum mass density (A=10^96 kg/m^3) the mass of the current universe being 10^54 kg would be the index of a possible physical nonsense of this presentation, without it being a sufficient argument to prefer its value in K/m^3. as you suspect, the rest of your explanation escapes me, and in particular the reject of the use of the statistical mechanics of the mix edit : for the record, can you remind me what [math]U[/math] is, please? 
The solution of the Cosmological constant problem ?
stephaneww replied to stephaneww's topic in Speculations
Actually, I didn't understand the argument above...ðŸ˜“ what is [math]G_n[/math] please ? and I'm not sure I understand it any better... 
The solution of the Cosmological constant problem ?
stephaneww replied to stephaneww's topic in Speculations
Thank you, too complex for me again indeed. (edit: It seems to me as if I use (96) page 23, but I guess it's more complicated) [math]m_p[/math] can't be considered the macro expression of the components you're quoting? Because that would be okay for the values and the dimension. and for this please ? : 
The solution of the Cosmological constant problem ?
stephaneww replied to stephaneww's topic in Speculations
If I'm not misinterpreting: the universe being an isolated system in the thermodynamic sense, this would mean that at the quantum level, for 1/2 m^3 of A + 1/2 m^3 of B, we find in a 1 m^3, by thermal equilibrium of A and B (thermodynamics?), a pressure C which is numerically equal to the energy density of the relativistic vacuum (= at the macro level). Could this be correct please ? Edit : we have the Relationship [math] E=k_B T[/math] where [math] E[/math] is Energy, [math] k_B [/math] is Boltzmann constant and [math] T[/math] temperature for an ideal gaz 
The solution of the Cosmological constant problem ?
stephaneww replied to stephaneww's topic in Speculations
I'm an idiot sometimes: the unit J/m^3 corresponds to 1 Pa. It fits in terms of units (1kg.m^1.s^2 ) in S.I. but I don't know if the expected sign (the "") is the one obtained. I don't know the sign conventions Um, I'm not sure about my handwriting in In. You might want to use this one for verification: [math]\Large{exp^{\frac{\ln(A)}{2}+\frac{\ln(B)}{2}}}=\rho_{\Lambda}.c^2[/math] [math]ln[/math] comes from statistical physics, thermodynamic and entropy But these fields are new to me. It's more than likely poorly formulated. 
The solution of the Cosmological constant problem ?
stephaneww replied to stephaneww's topic in Speculations
Well, I'm gonna try to make some physical sense out of this message: Classically we say that the energy density of the quantum vacuum is: [math] A=m_pc^2/l_p^3=\hbar.(l_p^{2})^2.c[/math] I, for one, found this unknown quantum energy density: [math] B=\hbar.\Lambda_{m^{2}}^2.c[/math] We can note that in [math] A[/math] we have [math]m_pc^2[/math] which is a mass energy while in [math] B[/math] we have [math]\Lambda[/math] which is the vacuum energy of the cosmology constant. We have [math]\rho_ {\Lambda}.c^2=\sqrt{A.B}[/math] energy density of the cosmological constant I think it can be said that the problem of the cosmological constant contains a formulation error: Indeed [math] B[/math] would be more logically suited to a quantum vacuum energy density, while [math] A[/math] would be more logically suited to a mass quantum energy density in terms of definition. Please tell me what you think of this opinion edit: we can also note that the values of A and B correspond to a thermal equilibrium such as [math]exp^{((lnA)/2+(lnB)/2)}=\rho_{\Lambda}.c^2[/math] by posing [math]k_B=1[/math]. but I don't know how to calculate what that's like in terms of pressure for [math]1m^3[/math]. 
A connection between entropic gravity and the vacuum catastrophe ?
stephaneww replied to stephaneww's topic in Speculations
read on a French forum I think that it is in this sense that AurÃ©lien Barrau talks about sound waves : ... not in a crystal lattice ? but here I'm entering territory I know nothing about.ðŸ™„ edit : and the holographic principle (and entropic gravity) are phenomena coming from thermodynamics, so ??? Which quantum information theory, please ? 
A connection between entropic gravity and the vacuum catastrophe ?
stephaneww replied to stephaneww's topic in Speculations
It seems we can do without this quantification: source : https://blogs.futurasciences.com/barrau/2017/03/13/lagravitationestelleemergente/ (Deepl.com traduction) further on : traduction : from which further more the emerging gravity in the blog 
A connection between entropic gravity and the vacuum catastrophe ?
stephaneww replied to stephaneww's topic in Speculations
is it possible ? I'm not sure because we have [math]G[/math] in [math]l_p^2[/math] in holographic approach ? 
A connection between entropic gravity and the vacuum catastrophe ?
stephaneww replied to stephaneww's topic in Speculations
ok ,thank you edti : Is the novelty with entropic gravity that it gives meaning to the value of the vacuum catastrophe =N "=number of 'bits' of information"? 
A connection between entropic gravity and the vacuum catastrophe ?
stephaneww replied to stephaneww's topic in Speculations
Um, I don't know what to think: the paper is from 2010 (https://philpapers.org/rec/GAOWGI) before the successful cosmological test of 2016. I don't get the argument, How is E.VERLINDE wrong ? 
A connection between entropic gravity and the vacuum catastrophe ?
stephaneww replied to stephaneww's topic in Speculations
already done: https://arxiv.org/pdf/1001.0785.pdf the simplified transcription is on Wikipedia here edit I'm interested if you can find some more, of course. 
A connection between entropic gravity and the vacuum catastrophe ?
stephaneww replied to stephaneww's topic in Speculations
Hi Mordred, MOND is only one application. there is also these one : https://en.wikipedia.org/wiki/Entropic_gravity where I need to dig for the last case please ? Edit : source from sciencepost.fr : https://www.sciencealert.com/acontroversialnewgravityhypothesishaspasseditsfirsttest 
A connection between entropic gravity and the vacuum catastrophe ?
stephaneww replied to stephaneww's topic in Speculations
Question: What interpretation can be made from this demonstration please ?