Big bang Definition and 916 Threads
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Is there a reason the Big Bang would be secret?
Is there a reason the Big Bang would be a private science (like time travel would be). Is the creation of a universe dangerous? Would there be any reason to this?- BadgerBadger92
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I If the Universe’s Mass was 100 At the Moment of the Big Bang....
Supposing that the total mass + energy content of the Big Bang was 100 in energy-equivalent terms. What would we consider its energy-equivalent mass to be today? If the universe is today accelerating and that acceleration is not abating, then (naïvely perhaps...) its (dark-energy) potential...- Islam Hassan
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- Forum: Cosmology
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Question about the Big Bang and CMB
This may seem like a naive or obvious question, which is why I posted it here. How do we know the cosmic microwave background came from the Big Bang? How can we tell how old radiation is?- BadgerBadger92
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- Forum: Introductory Physics Homework Help
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I Big Bang Singularity: Was It As "Infinitely Dense" As We Think?
The big bang supposedly originated from an infinitely dense singularity of space/time. The concept of infinitely dense is an artifact from our current perception of how immense our universe is today and how spread-out space/time is. However, if I were present in the reference frame of that...- Ratman101
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- Forum: Cosmology
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Astrophysics & Cosmology by Prof. S. Bharadwaj (NPTEL):- Lecture 1: Introduction
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Astrophysics & Cosmology by Prof. S. Bharadwaj (NPTEL):- Lecture 2: Kepler's Law
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Astrophysics & Cosmology by Prof. S. Bharadwaj (NPTEL):- Lecture 3: The Solar System
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Astrophysics & Cosmology by Prof. S. Bharadwaj (NPTEL):- Lecture 4: The Solar System (Contd.)
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Astrophysics & Cosmology by Prof. S. Bharadwaj (NPTEL):- Lecture 5: Binary Systems
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Astrophysics & Cosmology by Prof. S. Bharadwaj (NPTEL):- Lecture 6: Binary Systems (Contd.)
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Astrophysics & Cosmology by Prof. S. Bharadwaj (NPTEL):- Lecture 7: Tidal Forces and the Earth Moon System
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Astrophysics & Cosmology by Prof. S. Bharadwaj (NPTEL):- Lecture 8: Fluid Mechanics
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Astrophysics & Cosmology by Prof. S. Bharadwaj (NPTEL):- Lecture 9: Hydrostatics and the Solar Wind
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Astrophysics & Cosmology by Prof. S. Bharadwaj (NPTEL):- Lecture 10: Radiative Transfer
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Astrophysics & Cosmology by Prof. S. Bharadwaj (NPTEL):- Lecture 11: Radiative Transfer (Contd.)
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Astrophysics & Cosmology by Prof. S. Bharadwaj (NPTEL):- Lecture 12: Thermal Radiation
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Astrophysics & Cosmology by Prof. S. Bharadwaj (NPTEL):- Lecture 13: Thermal Radiation and the Sun
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Astrophysics & Cosmology by Prof. S. Bharadwaj (NPTEL):- Lecture 14: Virial Theorem and Its Application to Stars
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Astrophysics & Cosmology by Prof. S. Bharadwaj (NPTEL):- Lecture 15: Stars: Magnitudes and the H-R Diagram
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Astrophysics & Cosmology by Prof. S. Bharadwaj (NPTEL):- Lecture 16: Stellar Physics - I
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Astrophysics & Cosmology by Prof. S. Bharadwaj (NPTEL):- Lecture 17: Stellar Physics - II
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Astrophysics & Cosmology by Prof. S. Bharadwaj (NPTEL):- Lecture 18: Stellar Physics - III
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Astrophysics & Cosmology by Prof. S. Bharadwaj (NPTEL):- Lecture 19: Stellar Physics - IV
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Astrophysics & Cosmology by Prof. S. Bharadwaj (NPTEL):- Lecture 20: Stellar Physics - V
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Astrophysics & Cosmology by Prof. S. Bharadwaj (NPTEL):- Lecture 21: White Dwarfs
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Astrophysics & Cosmology by Prof. S. Bharadwaj (NPTEL):- Lecture 22: White Dwarfs and Neutron Stars
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Astrophysics & Cosmology by Prof. S. Bharadwaj (NPTEL):- Lecture 23: Galaxies
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Astrophysics & Cosmology by Prof. S. Bharadwaj (NPTEL):- Lecture 24: Galaxies and the Expanding Universe
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Astrophysics & Cosmology by Prof. S. Bharadwaj (NPTEL):- Lecture 25: The Expanding Universe
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Astrophysics & Cosmology by Prof. S. Bharadwaj (NPTEL):- Lecture 26: Dynamics of the Expanding Universe
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Astrophysics & Cosmology by Prof. S. Bharadwaj (NPTEL):- Lecture 27: Dynamics of the Expanding Universe (Contd.)
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Astrophysics & Cosmology by Prof. S. Bharadwaj (NPTEL):- Lecture 28: The Expanding Universe and the Cosmological Metric
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Astrophysics & Cosmology by Prof. S. Bharadwaj (NPTEL):- Lecture 29: The Cosmological Space - Time
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Astrophysics & Cosmology by Prof. S. Bharadwaj (NPTEL):- Lecture 30: Distances
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Astrophysics & Cosmology by Prof. S. Bharadwaj (NPTEL):- Lecture 31: Distances (Contd.)
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Astrophysics & Cosmology by Prof. S. Bharadwaj (NPTEL):- Lecture 32: Distances and the Hubble Parameter
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Astrophysics & Cosmology by Prof. S. Bharadwaj (NPTEL):- Lecture 33: Distances, the Hubble Parameter and Dark Energy (Contd.)
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Astrophysics & Cosmology by Prof. S. Bharadwaj (NPTEL):- Lecture 34: Distances and the Hubble Parameter
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Astrophysics & Cosmology by Prof. S. Bharadwaj (NPTEL):- Lecture 35: CMBR and Thermal History
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Astrophysics & Cosmology by Prof. S. Bharadwaj (NPTEL):- Lecture 36: CMBR and Thermal History (Contd...1)
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Astrophysics & Cosmology by Prof. S. Bharadwaj (NPTEL):- Lecture 37: CMBR and Thermal History (Contd...2)
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Astrophysics & Cosmology by Prof. S. Bharadwaj (NPTEL):- Lecture 38: Thermal History, Expansion Rate and Neutrino Mass
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Astrophysics & Cosmology by Prof. S. Bharadwaj (NPTEL):- Lecture 39: Thermal History: Neutrino Mass, Nucleosynthesis
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Astrophysics & Cosmology by Prof. S. Bharadwaj (NPTEL):- Lecture 40: Big Bang Nucleosynthesis
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B Was the Big Bang a quantum mechanical vacuum fluctuation?
It has been proposed by Edward P. Tryon that the Universe may be a large scale quantum mechanical vacuum fluctuation where positive mass-energy is balanced by negative gravitational potential energy, as a consequence of the early inflationary launch of the expansion of the Universe, in which...- mark!
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- Forum: Beyond the Standard Models
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B Did the Big Bang create space and time?
As I understand it Georges Lemaître, upon learning about Hubble's discovery that space is expanding, came up with the big bang theory. He thought that if space is getting bigger, then it must have been smaller at one point, and if you go back far enough you get an extremely dense singularity... -
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B How Did the Big Bang Happen If the Speed of Light Is a Limit?
Hello, If the speed of light is the maximum speed limit in our universe, how was the big bang event possible because surely the expansion would have been constrained by the speed of light? -
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I Did the big bang singularity not have a history?
Hello! Hawking has written, that the physical mechanics and the time before the big bang singularity cannot be measured, as time in this big bang singularity has been bent indefinitly and therefore has just started with the big bang. Questions: 1. Does Hawking mean, there has not been any time...- consuli
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- Replies: 8
- Forum: Special and General Relativity
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I Did cosmic inflation happen everywhere in the Universe?
General Relativity equations tells us that the earliest time of the universe which our physics can tell us had infinite space and infinite density (i.e. matter). Then space started expanding, thus increasing the distance of any 2 points of that infinite dense matter, thus making it less dense...- RobertSpencer
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- Forum: Cosmology
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I Are Friedman Equations Valid at the Moment of the Big Bang?
Are known solutions to Friedman equation exact at the moment of Big Bang or do they fail? I mean: do solutions of Friedman equations contain Big Bang as a point of time, or do they start "just after"? Can Friedman equations be extended to the time before Big Bang? If so, what do they say?
