Answer these questions please.
Why does our Sun have long Jeoparty?
How do spiral Galaxies form?
How do elliptical galaxies form?
Why does our Sun have long Jeoparty?
How do spiral Galaxies form?
How do elliptical galaxies form?
I am here to discuss the reason your "conservation of energy" objection is incorrect. Since you are unwilling to discuss it, the matter is closed. I will not be led off into other subjects.
I was not referring to you, I was replying to post #50.Billslugg, I did not mention conservation at all.
Cat
Harry, I wasn't addressing you. I may disagree with you on certain things, even to the way we see infinity, something we both realize to be real, but I have never felt like you were being insidious or craftily undermining. You are not the type. I read you as being straight up in how you see and believe things to be, and I have no problems at all with that. Stay your course, You are okay with me, Harry. Keep digging for the pictures of physics, the natures (plural, more dimensions than one) of things, sharpening your realizations as you go along. Do not lose your imagination, the basis of the richness, the magic, of science as well as the art.I did not try to lecture you.
I'm sorry if you feel that way.
Although we look at the Cyclic universe as one theory to explain the working of the universe, one should not discard the Big Bang Theory.
Keep on looking for theories
Advance yourself
Don’t be convinced by my threads and the papers i post
Work through what ever theories with an open mind.
Although we look at the Cyclic universe as one theory to explain the working of the universe, one should not discard the Big Bang Theory.
Keep on looking for theories
Advance yourself
Don’t be convinced by my threads and the papers i post
Work through what ever theories with an open mind.
These strange conditions would only have affected the first instant of creation, when the entire universe was packed into a region far smaller than than an atom . . . . . . . . . clearly when time sort of morphs into a space dimension, you're going to lose all notion of causality . . . . . . . . . It would be possible to move back and forth through the rotated imaginary time dimension , while the progression of time itself would be slower and slower, and eventually stop completely. The universe in this pre-time state could have existed for an eternity.
My emphasis.. . . . . . it is wrong to take the big bang literally, that is, to think of Einstein's theory as providing a true picture of the origin of the Universe. That is because general relativity predicts there to be a point in time at which the temperature, density and curvature of the Universe are all infinite, a situation mathematicians call a singularity.
My emphasis.To a physicist, this means that Einstein's theory breaks down at that point, and therefore cannot be used to predict how the Universe began, only how it evolved afterwards. So although we can employ the equations of general relativity and our observations of the heavens to learn about the Universe at a very young age, it is not correct to carry the big bang picture all the way back to the beginning.
So what if I broke my promise to myself and read a post of yours. So what if I [liked] it.Harry, I am finding it useful to review Hawking's position, prior to the Hertog publication. There is, [IMHO], scarcely a more succinct introduction to cyclic universe possibilities, than that contained in "The Grand Design" by Hawking (with Leonard Mlodinow) pp 128-9.
My emphasis.
My emphasis.
Of course, as I believe most will accept, we are in the realms of metaphysics, and cannot go back to observe any alleged singularity, or, as Hawking stated, cannot apply a broken down (at that point) theory.
No one has yet pointed out to me how any subsequent suggestions, arising after this fictitious start, might not have arisen equally from a cyclic model - maybe not in itself any more understandable than a singularity, but certainly no less worthy of metaphysical consideration.
Incidentally, as is well known both Hawking and Einstein were familiar with Flatland
Flatland - Wikipedia ,
Hawking uses the familiar balloon (ibid, page 126) analogy, without my pointing out the effect of expansion of a (n + 1) dimension observer.
Cat
The Galactic halo contains a complex ecosystem of multiphase intermediate-velocity and high-velocity gas clouds whose origin has defied clear explanation. They are generally believed to be involved in a Galaxy-wide recycling process, either through an accretion flow or a large-scale fountain flow, or both. We examine the evolution of these clouds in light of recent claims that they may trigger condensation of gas from the Galactic corona as they move through it. We measure condensation along a cloud's wake, with and without the presence of an ambient magnetic field, using two- (2D) and three-dimensional (3D), high-resolution simulations. We find that 3D simulations are essential to correctly capture the condensation in all cases. Magnetic fields significantly inhibit condensation in the wake of clouds at t≳25 Myr, preventing the sharp upturn in cold gas mass seen in previous non-magnetic studies. The magnetic field suppresses the Kelvin-Helmholtz instability responsible for the ablation and consequent mixing of a cloud with halo gas which drives the condensation. This effect is universal across different cloud properties (density, metallicity, velocity) and magnetic field properties (strength and orientation). Simple convergence tests demonstrate that resolving the gas on progressively smaller scales leads to even less condensation. While condensation still occurs in all cases, our results show that an ambient magnetic field drastically lowers the efficiency of fountain-driven accretion and likely also accretion from condensation around high-velocity clouds. These lower specific accretion rates are in better agreement with observational constraints compared to 3D, non-magnetic simulations.
We study the ground-state properties of self-bound dipolar droplets in quasi-two-dimensional geometry by using the Gaussian state theory. We show that there exist two quantum phases corresponding to the macroscopic squeezed vacuum and squeezed coherent states. We further show that the radial size versus atom number curve exhibits a double-dip structure, as a result of the multiple quantum phases. In particular, we find that the critical atom number for the self-bound droplets is determined by the quantum phases, which allows us to distinguish the quantum state and validates the Gaussian state theory.
Compact objects (COs) can exist and evolve in an active galactic nuclei (AGN) disk, triggering a series of attractive CO-related multi-messenger events around a supermassive black hole. To better understand the nature of an embedded CO and its surroundings and to investigate CO-related events more accurately, in this paper, we study the specific accretion process of a CO in an AGN disk and explore the role of outflow feedback. We show that the asymptotically isotropic outflow generated from the CO hyper-Eddington accretion would truncate the circum-CO disk and push out its surrounding gas, resulting in recurrent formation and refilling of an outflow cavity to intermittently stop the accretion. Applying this universal cyclic process to black holes (BHs) and neutron stars (NSs), we find that, even if it is above the Eddington rate, the mass rate accreted onto a BH is dramatically reduced compared with the initial gas captured rate and thus consumes few mass of the AGN disk; outflow feedback on a NS is generally similar, but possesses complexities on the existence of a stellar magnetic field and hard surface. We demonstrate that although outflow feedback itself may be unobservable, it remarkably alters the CO evolution via reducing its mass growth rate, and the AGN disk can survive from the otherwise drastic CO accretion overlooking outflow. In addition, we discuss the potential influence of underdense cavity on CO-related events, which embodies the significant role of outflow feedback as well.