LQC Lambda-CDM model bounce radius

In summary, the equations for the total Universe_mass-energy equivalence are determined based on the Lambda-CDM model parameters, Hubble Space Telescope and WMAP observational parameters, and the observable Universe radius. The maximum LQC bounce density is used to determine the bounce radius. The total amount of energy in the Universe is calculated to be 3.764 x 10^73 joules, with a total energy density equivalent to the LQC maximum energy density. The Universe LQC Lambda-CDM bounce radius is found to be 5.829 x 10^-14 meters. The Planck energy density and Planck length are referenced in this calculation. Further comparisons are made with other studies, including a promising paper by Maattih
  • #1
Orion1
973
3

These are my equations for the total Universe_mass-energy equivalence based upon the Lambda-CDM model parameters and the Hubble Space Telescope (HST) and WMAP observational parameters and the observable Universe radius in Systeme International units.

I attempted to collapse the Lambda-CDM model parameter dimensions using the maximum LQC bounce density to determine the bounce radius.

Observable Universe radius:
[tex]R_u = 4.399 \cdot 10^{26} \; \text{m}[/tex]
Lambda-CDM stellar Baryon density parameter:
[tex]\Omega_s = 0.005[/tex]
Hubble Space Telescope observable stellar number:
[tex]dN_s = 10^{22}[/tex]
Hubble Space Telescope observable stellar volume:
[tex]dV_s = 3.3871 \cdot 10^{78} \; \text{m}^3 \; \; \; (4 \cdot 10^{30} \; \text{ly}^3)[/tex]
Solar mass:
[tex]M_{\odot} = 1.9891 \cdot 10^{30} \; \text{kg}[/tex]

Planck energy density:
[tex]\boxed{\rho_p = \frac{E_p}{V_p} = \frac{3 c^7}{4 \pi \hbar G^2}}[/tex]

[tex]\boxed{\rho_p = 1.106 \cdot 10^{113} \; \frac{\text{j}}{\text{m}^3}}[/tex]

Universe_mass-energy equivalence total energy:
[tex]\boxed{E_t = \frac{4 \pi c^2 M_{\odot}}{3 \Omega_s} \left( \frac{dN_s}{dV_s} \right) R_u^3}[/tex]

Total amount of energy in the Universe:
[tex]\boxed{E_t = 3.764 \cdot 10^{73} \; \text{j}}[/tex]

Universe total energy density:
[tex]\rho_u = \frac{E_t}{V_u} = \frac{3 E_t}{4 \pi R_u^3} = \frac{M_{\odot} c^2}{\Omega_s} \left( \frac{dN_s}{dV_s} \right)[/tex]

LQC maximum energy density parameter: (ref. 10 p. 73 (5.7))
[tex]\boxed{\Omega_{LQC} = \frac{\rho_{\text{max}}}{\rho_p} = \frac{\hbar G}{2 \gamma^2 \lambda^2 c^7} = 0.41}[/tex]

Universe total energy density equivalent to LQC maximum energy density:
[tex]\rho_u = \rho_{\text{max}}[/tex]

Integration via substitution:
[tex]\frac{3 E_t}{4 \pi R_{LQC}^3} = \Omega_{LQC} \rho_p[/tex]

Universe LQC Lambda-CDM bounce radius:
[tex]\boxed{R_{LQC} = \left( \frac{3 E_t}{4 \pi \Omega_{LQC} \rho_p} \right)^{\frac{1}{3}}}[/tex]

[tex]\boxed{R_{LQC} = 5.829 \cdot 10^{-14} \; \text{m}}[/tex]

Reference:
Planck energy - Wikipedia
Planck length - Wikipedia
Lambda-CDM_model - Wikipedia
Universe - Wikipedia
Observable universe - Wikipedia
Dark matter - Wikipedia
Dark energy - Wikipedia
Friedmann equations - Wikipedia
Total amount of energy in the Universe - Orion1 #13
Loop Quantum Cosmology: A Status Report - Abhay Ashtekar, Parampreet Singh
 
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  • #2
May please Check with Maattihias Bartelmann of MPI for Astrophysics Garching Germany.

I have his paper with me on this subject,and found promising like yours,but I have to compare.
 
  • #3


Universe total energy density equivalent to Planck energy density:
[tex]\rho_u = \rho_{p}[/tex]

Integration via substitution:
[tex]\frac{3 E_t}{4 \pi R_{1}^3} = \rho_p[/tex]

Universe Planck energy density bounce radius:
[tex]\boxed{R_{1} = \left( \frac{3 E_t}{4 \pi \rho_p} \right)^{\frac{1}{3}}}[/tex]

[tex]\boxed{R_{1} = 4.330 \cdot 10^{-14} \; \text{m}}[/tex]

Reference:
http://www.ita.uni-heidelberg.de/research/bartelmann/Lectures/cosmology/cosmology.pdf
 
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1. What is the LQC Lambda-CDM model bounce radius?

The LQC Lambda-CDM model bounce radius is a concept in theoretical physics that refers to the radius of the universe at the time of the Big Bounce, an event that is theorized to have occurred before the Big Bang. This model suggests that the universe is oscillating between expanding and contracting phases, with the bounce radius representing the minimum size of the universe during the contracting phase.

2. How is the bounce radius calculated in the LQC Lambda-CDM model?

The bounce radius is calculated using a combination of quantum mechanics and general relativity. In this model, the universe is described as a loop quantum cosmology (LQC) and the energy density is determined by the cosmological constant (Lambda) and cold dark matter (CDM). By solving the equations of motion for this system, the bounce radius can be determined.

3. What implications does the bounce radius have for the fate of the universe?

The bounce radius suggests that the universe will continue to oscillate between expanding and contracting phases indefinitely. This challenges the traditional Big Bang theory, which suggests that the universe will continue to expand until it eventually reaches a state of maximum entropy and heat death. However, more research is needed to fully understand the implications of the bounce radius for the fate of the universe.

4. How does the LQC Lambda-CDM model explain the early stages of the universe?

The LQC Lambda-CDM model suggests that the universe underwent a series of bounces before the Big Bang, with each bounce representing a new cycle of expansion and contraction. This allows for a more complete understanding of the early stages of the universe, as it can explain the smoothness and homogeneity of the current universe, which is not fully explained by the traditional Big Bang theory.

5. Are there any current experiments or observations that support the LQC Lambda-CDM model?

At this time, there is not enough evidence to fully support the LQC Lambda-CDM model. However, there are ongoing experiments and observations, such as the European Space Agency's Euclid mission, that may provide more insight into the validity of this model. Additionally, further developments in theoretical physics and advancements in technology may also help to support or disprove the LQC Lambda-CDM model in the future.

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