Space-Time Concepts, Gravity, Models of the Universe

Concepts of Time:

A defense of the reality of time    In a 'rainbow' universe time may have no beginning

The history of time and frequency from antiquity to the present day

FOAM: the importance of time synchronization

BoBar experiment confirms time asymmetry     Paradigm shift offers a new look at the beginning of time  

Perfectly accurate clocks turn out to be impossible    The most accurate optical single-ion clock worldwide

1400km of optical fibre connect optical clocks in France and Germany

Leap second: French time lords add one second to 2015    The days are getting longer

Researchers explain why the Greenwich prime meridian moved

Superradiant laser may boost atomic clocks, create 'rulers' for space

Scientists create time crystals, a rule-bending new form of matter

A rock is a clock: physicist uses matter to tell time

Physicists find signs of a time crystal

A look into the fourth dimension

Gravity:

Testing theories of modified gravity    Emergent gravity and the dark universe

Physicists find a way to see the 'grin' of Quantum Gravity

Gravitational constant appears universally constant, pulsar study suggests

Important milestone reached on road to a redefined kilogram

A more fundamental International System of Units

Attractive force arises from black-body radiation, says physicists

Understanding of complex networks could help unify gravity and quantum mechanics

New math bridges holography and twistor theory

A simple view of gravity does not fully explain the distribution of stars in crowded clusters

High-resolution data demonstrate gravitational lensing of the cosmic microwave background

New study implies existence of fifth force of nature

The long path to understanding gravity    

Space-Time:   

Spacetime: a smoother brew than we knew    Spacetime has No Time Dimension   Inside the big wormhole

New Discovery about the Fabric of Space-Time    Space-Time crystals of trapped ions

A wrinkle in space-time      Space-Time Vortex around Earth    What is the Universe expanding into?

Structure in the fabric of space - the African Arrow    Boosting of force from empty space    

First signs of weird quantum property of empty space     How spacetime is built by quantum entanglement

Is nature continuous or discrete? How the atomist error was born

Scientists discover a jewel at the heart of quantum physics

Quantum computer as detector shows space is not squeezed    Simulating extreme space-times

Bringing time, space together for universal symmetry     Visualizing 11-dimensions

New mathrmatical model links space-time theories     

Space-Time crystals on the horizon    Time crystals realize new order of space-time

Shape from sound - new methods to probe the Universe     Cosmography of the Local Universe

A robust constraint on cosmic textures from the cosmic microwave background

International collaboration replicates amplification of cosmic magnetic fields     

Superfluid turbulence through the lens of black holes

Maximum and minimum values, cosmology, a conjecture and Beckenstein bound

Expansion of space measurement improved

The mechanism that explains why our universe was born with 3 dimensions: a 40-year-old puzzle of superstring theory solved by supercomputer

NASA's Gravity Probe Spacecraft Confirms Einstein's 'Warping of SpaceTime & Frame-Dragging'

Powers of Ten    Planck results 2013     

Alternative Models of the Universe:

How the Universe works    Many universes, many theories    The Scale  of the Universe 2

Paradoxes of cosmological physics in the beginning of the 21st Century

Caught in the cosmic web    How order arises in the cosmos

Could a Multiverse be hospitable to life?

Misconceptions about the universe    Reinterpreting dark matter 

Astronomers discover new way to measure Universe    Universe expanding faster than expected

Recipe for a universe    Is the Universe a bubble? Let's check    Are We Living in a Hologram?

The universe is really a hologram, according to new simulations  

We are One of a Vast Universe of New Universes Constantly Being Created

Experimental limits on neutron disappearance into another braneworld

How we escaped from the Big Bang    Beyond the horizon of the Universe 

Getting the math of the universe to cancel out

Collapse of the universe is closer than ever before

Universe is older than previously thought    Planck mission explores the history of our universe

Light and Matter:

Light in a spin    A journey of light through space and time (video)    Sounds from space emr

Precise test confirms speed of light is constant    Quest to test Einstein's speed limit 

Teaching general relativity to undergraduates    Special relativity induced by granular space

NIST pair of aluminum atomic clocks reveal Eistein's relativity at a personal scale

Detection of the cosmic gamma ray horizon measures all the light in the universe since the Big Bang

Scientists discover how to turn light into matter after 80-year quest  Testing Einstein's E=mc2 in outer space

Simulation shows that dark energy and matter can reproduce the Universe     

A new Einstein Ring    5-dimensional black hole could 'break' general relativity

Flashes from faster-than-light spots may help illuminate astronomical secrets

Extending Einstein's theory beyond light speed   Light from galaxy clusters confirm theory of relativity

Newly discovered 3-star system to challenge Einstein's theory of General Relativity

A heavy weight for Einstein: observations of the most massive neutron star confirms Eistein's theory

Can strongly lensed Type 1a supernovae resolve one of cosmologies biggest controversies?

Bizarre binary star system pushes study of relativity to new limits   Dead star warps light of red star

Left-handed cosmic magnetic field could explain missing antimatter

Transfer of atomic mass with a photon solves the momentum paradox of light

Wormholes:

Magnetic wormhole created for the first time

 'Spooky action' builds a wormhole between 'entangled' particles

Telescopes:

Square Kilometre Array (SKA)